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Auto merge of #63671 - Centril:rollup-zufavt5, r=Centril

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Rollup of 5 pull requests

Successful merges:

 - #62451 (Add APIs for uninitialized Box, Rc, and Arc. (Plus get_mut_unchecked))
 - #63487 (Remove meaningless comments in src/test)
 - #63657 (Crank up invalid value lint)
 - #63667 (resolve: Properly integrate derives and `macro_rules` scopes)
 - #63669 (fix typos in mir/interpret)

Failed merges:

r? @ghost
This commit is contained in:
bors 2019-08-17 21:30:10 +00:00
commit bd1da18b04
54 changed files with 924 additions and 290 deletions
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135
src/liballoc/boxed.rs
View file

@ -91,8 +91,10 @@ use core::ops::{
CoerceUnsized, DispatchFromDyn, Deref, DerefMut, Receiver, Generator, GeneratorState CoerceUnsized, DispatchFromDyn, Deref, DerefMut, Receiver, Generator, GeneratorState
}; };
use core::ptr::{self, NonNull, Unique}; use core::ptr::{self, NonNull, Unique};
use core::slice;
use core::task::{Context, Poll}; use core::task::{Context, Poll};
use crate::alloc::{self, Global, Alloc};
use crate::vec::Vec; use crate::vec::Vec;
use crate::raw_vec::RawVec; use crate::raw_vec::RawVec;
use crate::str::from_boxed_utf8_unchecked; use crate::str::from_boxed_utf8_unchecked;
@ -121,6 +123,34 @@ impl<T> Box<T> {
box x box x
} }
/// Constructs a new box with uninitialized contents.
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
///
/// let mut five = Box::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// five.as_mut_ptr().write(5);
///
/// five.assume_init()
/// };
///
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_uninit() -> Box<mem::MaybeUninit<T>> {
let layout = alloc::Layout::new::<mem::MaybeUninit<T>>();
let ptr = unsafe {
Global.alloc(layout)
.unwrap_or_else(|_| alloc::handle_alloc_error(layout))
};
Box(ptr.cast().into())
}
/// Constructs a new `Pin<Box<T>>`. If `T` does not implement `Unpin`, then /// Constructs a new `Pin<Box<T>>`. If `T` does not implement `Unpin`, then
/// `x` will be pinned in memory and unable to be moved. /// `x` will be pinned in memory and unable to be moved.
#[stable(feature = "pin", since = "1.33.0")] #[stable(feature = "pin", since = "1.33.0")]
@ -130,6 +160,111 @@ impl<T> Box<T> {
} }
} }
impl<T> Box<[T]> {
/// Constructs a new boxed slice with uninitialized contents.
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
///
/// let mut values = Box::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// values[0].as_mut_ptr().write(1);
/// values[1].as_mut_ptr().write(2);
/// values[2].as_mut_ptr().write(3);
///
/// values.assume_init()
/// };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_uninit_slice(len: usize) -> Box<[mem::MaybeUninit<T>]> {
let layout = alloc::Layout::array::<mem::MaybeUninit<T>>(len).unwrap();
let ptr = unsafe { alloc::alloc(layout) };
let unique = Unique::new(ptr).unwrap_or_else(|| alloc::handle_alloc_error(layout));
let slice = unsafe { slice::from_raw_parts_mut(unique.cast().as_ptr(), len) };
Box(Unique::from(slice))
}
}
impl<T> Box<mem::MaybeUninit<T>> {
/// Converts to `Box<T>`.
///
/// # Safety
///
/// As with [`MaybeUninit::assume_init`],
/// it is up to the caller to guarantee that the value
/// really is in an initialized state.
/// Calling this when the content is not yet fully initialized
/// causes immediate undefined behavior.
///
/// [`MaybeUninit::assume_init`]: ../../std/mem/union.MaybeUninit.html#method.assume_init
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
///
/// let mut five = Box::<u32>::new_uninit();
///
/// let five: Box<u32> = unsafe {
/// // Deferred initialization:
/// five.as_mut_ptr().write(5);
///
/// five.assume_init()
/// };
///
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
#[inline]
pub unsafe fn assume_init(self) -> Box<T> {
Box(Box::into_unique(self).cast())
}
}
impl<T> Box<[mem::MaybeUninit<T>]> {
/// Converts to `Box<[T]>`.
///
/// # Safety
///
/// As with [`MaybeUninit::assume_init`],
/// it is up to the caller to guarantee that the values
/// really are in an initialized state.
/// Calling this when the content is not yet fully initialized
/// causes immediate undefined behavior.
///
/// [`MaybeUninit::assume_init`]: ../../std/mem/union.MaybeUninit.html#method.assume_init
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
///
/// let mut values = Box::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// values[0].as_mut_ptr().write(1);
/// values[1].as_mut_ptr().write(2);
/// values[2].as_mut_ptr().write(3);
///
/// values.assume_init()
/// };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
#[inline]
pub unsafe fn assume_init(self) -> Box<[T]> {
Box(Unique::new_unchecked(Box::into_raw(self) as _))
}
}
impl<T: ?Sized> Box<T> { impl<T: ?Sized> Box<T> {
/// Constructs a box from a raw pointer. /// Constructs a box from a raw pointer.
/// ///

186
src/liballoc/rc.rs
View file

@ -327,6 +327,37 @@ impl<T> Rc<T> {
})) }))
} }
/// Constructs a new `Rc` with uninitialized contents.
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::rc::Rc;
///
/// let mut five = Rc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
///
/// five.assume_init()
/// };
///
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_uninit() -> Rc<mem::MaybeUninit<T>> {
unsafe {
Rc::from_ptr(Rc::allocate_for_layout(
Layout::new::<T>(),
|mem| mem as *mut RcBox<mem::MaybeUninit<T>>,
))
}
}
/// Constructs a new `Pin<Rc<T>>`. If `T` does not implement `Unpin`, then /// Constructs a new `Pin<Rc<T>>`. If `T` does not implement `Unpin`, then
/// `value` will be pinned in memory and unable to be moved. /// `value` will be pinned in memory and unable to be moved.
#[stable(feature = "pin", since = "1.33.0")] #[stable(feature = "pin", since = "1.33.0")]
@ -377,6 +408,118 @@ impl<T> Rc<T> {
} }
} }
impl<T> Rc<[T]> {
/// Constructs a new reference-counted slice with uninitialized contents.
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::rc::Rc;
///
/// let mut values = Rc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Rc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Rc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
///
/// values.assume_init()
/// };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_uninit_slice(len: usize) -> Rc<[mem::MaybeUninit<T>]> {
unsafe {
Rc::from_ptr(Rc::allocate_for_slice(len))
}
}
}
impl<T> Rc<mem::MaybeUninit<T>> {
/// Converts to `Rc<T>`.
///
/// # Safety
///
/// As with [`MaybeUninit::assume_init`],
/// it is up to the caller to guarantee that the value
/// really is in an initialized state.
/// Calling this when the content is not yet fully initialized
/// causes immediate undefined behavior.
///
/// [`MaybeUninit::assume_init`]: ../../std/mem/union.MaybeUninit.html#method.assume_init
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::rc::Rc;
///
/// let mut five = Rc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
///
/// five.assume_init()
/// };
///
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
#[inline]
pub unsafe fn assume_init(self) -> Rc<T> {
Rc::from_inner(mem::ManuallyDrop::new(self).ptr.cast())
}
}
impl<T> Rc<[mem::MaybeUninit<T>]> {
/// Converts to `Rc<[T]>`.
///
/// # Safety
///
/// As with [`MaybeUninit::assume_init`],
/// it is up to the caller to guarantee that the value
/// really is in an initialized state.
/// Calling this when the content is not yet fully initialized
/// causes immediate undefined behavior.
///
/// [`MaybeUninit::assume_init`]: ../../std/mem/union.MaybeUninit.html#method.assume_init
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::rc::Rc;
///
/// let mut values = Rc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Rc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Rc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
///
/// values.assume_init()
/// };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
#[inline]
pub unsafe fn assume_init(self) -> Rc<[T]> {
Rc::from_ptr(mem::ManuallyDrop::new(self).ptr.as_ptr() as _)
}
}
impl<T: ?Sized> Rc<T> { impl<T: ?Sized> Rc<T> {
/// Consumes the `Rc`, returning the wrapped pointer. /// Consumes the `Rc`, returning the wrapped pointer.
/// ///
@ -560,13 +703,46 @@ impl<T: ?Sized> Rc<T> {
pub fn get_mut(this: &mut Self) -> Option<&mut T> { pub fn get_mut(this: &mut Self) -> Option<&mut T> {
if Rc::is_unique(this) { if Rc::is_unique(this) {
unsafe { unsafe {
Some(&mut this.ptr.as_mut().value) Some(Rc::get_mut_unchecked(this))
} }
} else { } else {
None None
} }
} }
/// Returns a mutable reference to the inner value,
/// without any check.
///
/// See also [`get_mut`], which is safe and does appropriate checks.
///
/// [`get_mut`]: struct.Rc.html#method.get_mut
///
/// # Safety
///
/// Any other `Rc` or [`Weak`] pointers to the same value must not be dereferenced
/// for the duration of the returned borrow.
/// This is trivially the case if no such pointers exist,
/// for example immediately after `Rc::new`.
///
/// # Examples
///
/// ```
/// #![feature(get_mut_unchecked)]
///
/// use std::rc::Rc;
///
/// let mut x = Rc::new(String::new());
/// unsafe {
/// Rc::get_mut_unchecked(&mut x).push_str("foo")
/// }
/// assert_eq!(*x, "foo");
/// ```
#[inline]
#[unstable(feature = "get_mut_unchecked", issue = "63292")]
pub unsafe fn get_mut_unchecked(this: &mut Self) -> &mut T {
&mut this.ptr.as_mut().value
}
#[inline] #[inline]
#[stable(feature = "ptr_eq", since = "1.17.0")] #[stable(feature = "ptr_eq", since = "1.17.0")]
/// Returns `true` if the two `Rc`s point to the same value (not /// Returns `true` if the two `Rc`s point to the same value (not
@ -704,11 +880,11 @@ impl Rc<dyn Any> {
impl<T: ?Sized> Rc<T> { impl<T: ?Sized> Rc<T> {
/// Allocates an `RcBox<T>` with sufficient space for /// Allocates an `RcBox<T>` with sufficient space for
/// an unsized value where the value has the layout provided. /// a possibly-unsized value where the value has the layout provided.
/// ///
/// The function `mem_to_rcbox` is called with the data pointer /// The function `mem_to_rcbox` is called with the data pointer
/// and must return back a (potentially fat)-pointer for the `RcBox<T>`. /// and must return back a (potentially fat)-pointer for the `RcBox<T>`.
unsafe fn allocate_for_unsized( unsafe fn allocate_for_layout(
value_layout: Layout, value_layout: Layout,
mem_to_rcbox: impl FnOnce(*mut u8) -> *mut RcBox<T> mem_to_rcbox: impl FnOnce(*mut u8) -> *mut RcBox<T>
) -> *mut RcBox<T> { ) -> *mut RcBox<T> {
@ -737,7 +913,7 @@ impl<T: ?Sized> Rc<T> {
/// Allocates an `RcBox<T>` with sufficient space for an unsized value /// Allocates an `RcBox<T>` with sufficient space for an unsized value
unsafe fn allocate_for_ptr(ptr: *const T) -> *mut RcBox<T> { unsafe fn allocate_for_ptr(ptr: *const T) -> *mut RcBox<T> {
// Allocate for the `RcBox<T>` using the given value. // Allocate for the `RcBox<T>` using the given value.
Self::allocate_for_unsized( Self::allocate_for_layout(
Layout::for_value(&*ptr), Layout::for_value(&*ptr),
|mem| set_data_ptr(ptr as *mut T, mem) as *mut RcBox<T>, |mem| set_data_ptr(ptr as *mut T, mem) as *mut RcBox<T>,
) )
@ -768,7 +944,7 @@ impl<T: ?Sized> Rc<T> {
impl<T> Rc<[T]> { impl<T> Rc<[T]> {
/// Allocates an `RcBox<[T]>` with the given length. /// Allocates an `RcBox<[T]>` with the given length.
unsafe fn allocate_for_slice(len: usize) -> *mut RcBox<[T]> { unsafe fn allocate_for_slice(len: usize) -> *mut RcBox<[T]> {
Self::allocate_for_unsized( Self::allocate_for_layout(
Layout::array::<T>(len).unwrap(), Layout::array::<T>(len).unwrap(),
|mem| ptr::slice_from_raw_parts_mut(mem as *mut T, len) as *mut RcBox<[T]>, |mem| ptr::slice_from_raw_parts_mut(mem as *mut T, len) as *mut RcBox<[T]>,
) )

186
src/liballoc/sync.rs
View file

@ -311,6 +311,37 @@ impl<T> Arc<T> {
Self::from_inner(Box::into_raw_non_null(x)) Self::from_inner(Box::into_raw_non_null(x))
} }
/// Constructs a new `Arc` with uninitialized contents.
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::sync::Arc;
///
/// let mut five = Arc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
///
/// five.assume_init()
/// };
///
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_uninit() -> Arc<mem::MaybeUninit<T>> {
unsafe {
Arc::from_ptr(Arc::allocate_for_layout(
Layout::new::<T>(),
|mem| mem as *mut ArcInner<mem::MaybeUninit<T>>,
))
}
}
/// Constructs a new `Pin<Arc<T>>`. If `T` does not implement `Unpin`, then /// Constructs a new `Pin<Arc<T>>`. If `T` does not implement `Unpin`, then
/// `data` will be pinned in memory and unable to be moved. /// `data` will be pinned in memory and unable to be moved.
#[stable(feature = "pin", since = "1.33.0")] #[stable(feature = "pin", since = "1.33.0")]
@ -361,6 +392,118 @@ impl<T> Arc<T> {
} }
} }
impl<T> Arc<[T]> {
/// Constructs a new reference-counted slice with uninitialized contents.
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::sync::Arc;
///
/// let mut values = Arc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Arc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Arc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
///
/// values.assume_init()
/// };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_uninit_slice(len: usize) -> Arc<[mem::MaybeUninit<T>]> {
unsafe {
Arc::from_ptr(Arc::allocate_for_slice(len))
}
}
}
impl<T> Arc<mem::MaybeUninit<T>> {
/// Converts to `Arc<T>`.
///
/// # Safety
///
/// As with [`MaybeUninit::assume_init`],
/// it is up to the caller to guarantee that the value
/// really is in an initialized state.
/// Calling this when the content is not yet fully initialized
/// causes immediate undefined behavior.
///
/// [`MaybeUninit::assume_init`]: ../../std/mem/union.MaybeUninit.html#method.assume_init
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::sync::Arc;
///
/// let mut five = Arc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
///
/// five.assume_init()
/// };
///
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
#[inline]
pub unsafe fn assume_init(self) -> Arc<T> {
Arc::from_inner(mem::ManuallyDrop::new(self).ptr.cast())
}
}
impl<T> Arc<[mem::MaybeUninit<T>]> {
/// Converts to `Arc<[T]>`.
///
/// # Safety
///
/// As with [`MaybeUninit::assume_init`],
/// it is up to the caller to guarantee that the value
/// really is in an initialized state.
/// Calling this when the content is not yet fully initialized
/// causes immediate undefined behavior.
///
/// [`MaybeUninit::assume_init`]: ../../std/mem/union.MaybeUninit.html#method.assume_init
///
/// # Examples
///
/// ```
/// #![feature(new_uninit)]
/// #![feature(get_mut_unchecked)]
///
/// use std::sync::Arc;
///
/// let mut values = Arc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Arc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Arc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
///
/// values.assume_init()
/// };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
#[inline]
pub unsafe fn assume_init(self) -> Arc<[T]> {
Arc::from_ptr(mem::ManuallyDrop::new(self).ptr.as_ptr() as _)
}
}
impl<T: ?Sized> Arc<T> { impl<T: ?Sized> Arc<T> {
/// Consumes the `Arc`, returning the wrapped pointer. /// Consumes the `Arc`, returning the wrapped pointer.
/// ///
@ -593,11 +736,11 @@ impl<T: ?Sized> Arc<T> {
impl<T: ?Sized> Arc<T> { impl<T: ?Sized> Arc<T> {
/// Allocates an `ArcInner<T>` with sufficient space for /// Allocates an `ArcInner<T>` with sufficient space for
/// an unsized value where the value has the layout provided. /// a possibly-unsized value where the value has the layout provided.
/// ///
/// The function `mem_to_arcinner` is called with the data pointer /// The function `mem_to_arcinner` is called with the data pointer
/// and must return back a (potentially fat)-pointer for the `ArcInner<T>`. /// and must return back a (potentially fat)-pointer for the `ArcInner<T>`.
unsafe fn allocate_for_unsized( unsafe fn allocate_for_layout(
value_layout: Layout, value_layout: Layout,
mem_to_arcinner: impl FnOnce(*mut u8) -> *mut ArcInner<T> mem_to_arcinner: impl FnOnce(*mut u8) -> *mut ArcInner<T>
) -> *mut ArcInner<T> { ) -> *mut ArcInner<T> {
@ -625,7 +768,7 @@ impl<T: ?Sized> Arc<T> {
/// Allocates an `ArcInner<T>` with sufficient space for an unsized value. /// Allocates an `ArcInner<T>` with sufficient space for an unsized value.
unsafe fn allocate_for_ptr(ptr: *const T) -> *mut ArcInner<T> { unsafe fn allocate_for_ptr(ptr: *const T) -> *mut ArcInner<T> {
// Allocate for the `ArcInner<T>` using the given value. // Allocate for the `ArcInner<T>` using the given value.
Self::allocate_for_unsized( Self::allocate_for_layout(
Layout::for_value(&*ptr), Layout::for_value(&*ptr),
|mem| set_data_ptr(ptr as *mut T, mem) as *mut ArcInner<T>, |mem| set_data_ptr(ptr as *mut T, mem) as *mut ArcInner<T>,
) )
@ -656,7 +799,7 @@ impl<T: ?Sized> Arc<T> {
impl<T> Arc<[T]> { impl<T> Arc<[T]> {
/// Allocates an `ArcInner<[T]>` with the given length. /// Allocates an `ArcInner<[T]>` with the given length.
unsafe fn allocate_for_slice(len: usize) -> *mut ArcInner<[T]> { unsafe fn allocate_for_slice(len: usize) -> *mut ArcInner<[T]> {
Self::allocate_for_unsized( Self::allocate_for_layout(
Layout::array::<T>(len).unwrap(), Layout::array::<T>(len).unwrap(),
|mem| ptr::slice_from_raw_parts_mut(mem as *mut T, len) as *mut ArcInner<[T]>, |mem| ptr::slice_from_raw_parts_mut(mem as *mut T, len) as *mut ArcInner<[T]>,
) )
@ -945,13 +1088,46 @@ impl<T: ?Sized> Arc<T> {
// the Arc itself to be `mut`, so we're returning the only possible // the Arc itself to be `mut`, so we're returning the only possible
// reference to the inner data. // reference to the inner data.
unsafe { unsafe {
Some(&mut this.ptr.as_mut().data) Some(Arc::get_mut_unchecked(this))
} }
} else { } else {
None None
} }
} }
/// Returns a mutable reference to the inner value,
/// without any check.
///
/// See also [`get_mut`], which is safe and does appropriate checks.
///
/// [`get_mut`]: struct.Arc.html#method.get_mut
///
/// # Safety
///
/// Any other `Arc` or [`Weak`] pointers to the same value must not be dereferenced
/// for the duration of the returned borrow.
/// This is trivially the case if no such pointers exist,
/// for example immediately after `Arc::new`.
///
/// # Examples
///
/// ```
/// #![feature(get_mut_unchecked)]
///
/// use std::sync::Arc;
///
/// let mut x = Arc::new(String::new());
/// unsafe {
/// Arc::get_mut_unchecked(&mut x).push_str("foo")
/// }
/// assert_eq!(*x, "foo");
/// ```
#[inline]
#[unstable(feature = "get_mut_unchecked", issue = "63292")]
pub unsafe fn get_mut_unchecked(this: &mut Self) -> &mut T {
&mut this.ptr.as_mut().data
}
/// Determine whether this is the unique reference (including weak refs) to /// Determine whether this is the unique reference (including weak refs) to
/// the underlying data. /// the underlying data.
/// ///

8
src/libcore/ptr/unique.rs
View file

@ -122,6 +122,14 @@ impl<T: ?Sized> Unique<T> {
pub unsafe fn as_mut(&mut self) -> &mut T { pub unsafe fn as_mut(&mut self) -> &mut T {
&mut *self.as_ptr() &mut *self.as_ptr()
} }
/// Casts to a pointer of another type.
#[inline]
pub const fn cast<U>(self) -> Unique<U> {
unsafe {
Unique::new_unchecked(self.as_ptr() as *mut U)
}
}
} }
#[unstable(feature = "ptr_internals", issue = "0")] #[unstable(feature = "ptr_internals", issue = "0")]

2
src/librustc/hir/map/def_collector.rs
View file

@ -74,7 +74,7 @@ impl<'a> DefCollector<'a> {
}) })
} }
fn visit_macro_invoc(&mut self, id: NodeId) { pub fn visit_macro_invoc(&mut self, id: NodeId) {
self.definitions.set_invocation_parent(id.placeholder_to_expn_id(), self.parent_def); self.definitions.set_invocation_parent(id.placeholder_to_expn_id(), self.parent_def);
} }
} }

2
src/librustc/mir/interpret/allocation.rs
View file

@ -306,7 +306,7 @@ impl<'tcx, Tag: Copy, Extra: AllocationExtra<Tag>> Allocation<Tag, Extra> {
/// ///
/// zsts can't be read out of two reasons: /// zsts can't be read out of two reasons:
/// * byteorder cannot work with zero element buffers /// * byteorder cannot work with zero element buffers
/// * in oder to obtain a `Pointer` we need to check for ZSTness anyway due to integer pointers /// * in order to obtain a `Pointer` we need to check for ZSTness anyway due to integer pointers
/// being valid for ZSTs /// being valid for ZSTs
/// ///
/// It is the caller's responsibility to check bounds and alignment beforehand. /// It is the caller's responsibility to check bounds and alignment beforehand.

154
src/librustc_lint/builtin.rs
View file

@ -1876,16 +1876,70 @@ declare_lint_pass!(InvalidValue => [INVALID_VALUE]);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue { impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &hir::Expr) { fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &hir::Expr) {
const ZEROED_PATH: &[Symbol] = &[sym::core, sym::mem, sym::zeroed]; #[derive(Debug, Copy, Clone, PartialEq)]
const UININIT_PATH: &[Symbol] = &[sym::core, sym::mem, sym::uninitialized]; enum InitKind { Zeroed, Uninit };
/// Information about why a type cannot be initialized this way. /// Information about why a type cannot be initialized this way.
/// Contains an error message and optionally a span to point at. /// Contains an error message and optionally a span to point at.
type InitError = (String, Option<Span>); type InitError = (String, Option<Span>);
/// Test if this constant is all-0.
fn is_zero(expr: &hir::Expr) -> bool {
use hir::ExprKind::*;
use syntax::ast::LitKind::*;
match &expr.node {
Lit(lit) =>
if let Int(i, _) = lit.node {
i == 0
} else {
false
},
Tup(tup) =>
tup.iter().all(is_zero),
_ =>
false
}
}
/// Determine if this expression is a "dangerous initialization".
fn is_dangerous_init(cx: &LateContext<'_, '_>, expr: &hir::Expr) -> Option<InitKind> {
const ZEROED_PATH: &[Symbol] = &[sym::core, sym::mem, sym::zeroed];
const UININIT_PATH: &[Symbol] = &[sym::core, sym::mem, sym::uninitialized];
// `transmute` is inside an anonymous module (the `extern` block?);
// `Invalid` represents the empty string and matches that.
const TRANSMUTE_PATH: &[Symbol] =
&[sym::core, sym::intrinsics, kw::Invalid, sym::transmute];
if let hir::ExprKind::Call(ref path_expr, ref args) = expr.node {
if let hir::ExprKind::Path(ref qpath) = path_expr.node {
let def_id = cx.tables.qpath_res(qpath, path_expr.hir_id).opt_def_id()?;
if cx.match_def_path(def_id, ZEROED_PATH) {
return Some(InitKind::Zeroed);
}
if cx.match_def_path(def_id, UININIT_PATH) {
return Some(InitKind::Uninit);
}
if cx.match_def_path(def_id, TRANSMUTE_PATH) {
if is_zero(&args[0]) {
return Some(InitKind::Zeroed);
}
}
// FIXME: Also detect `MaybeUninit::zeroed().assume_init()` and
// `MaybeUninit::uninit().assume_init()`.
}
}
None
}
/// Return `Some` only if we are sure this type does *not* /// Return `Some` only if we are sure this type does *not*
/// allow zero initialization. /// allow zero initialization.
fn ty_find_init_error<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Option<InitError> { fn ty_find_init_error<'tcx>(
tcx: TyCtxt<'tcx>,
ty: Ty<'tcx>,
init: InitKind,
) -> Option<InitError> {
use rustc::ty::TyKind::*; use rustc::ty::TyKind::*;
match ty.sty { match ty.sty {
// Primitive types that don't like 0 as a value. // Primitive types that don't like 0 as a value.
@ -1893,8 +1947,30 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
Adt(..) if ty.is_box() => Some((format!("`Box` must be non-null"), None)), Adt(..) if ty.is_box() => Some((format!("`Box` must be non-null"), None)),
FnPtr(..) => Some((format!("Function pointers must be non-null"), None)), FnPtr(..) => Some((format!("Function pointers must be non-null"), None)),
Never => Some((format!("The never type (`!`) has no valid value"), None)), Never => Some((format!("The never type (`!`) has no valid value"), None)),
// Recurse for some compound types. // Primitive types with other constraints.
Bool if init == InitKind::Uninit =>
Some((format!("Booleans must be `true` or `false`"), None)),
Char if init == InitKind::Uninit =>
Some((format!("Characters must be a valid unicode codepoint"), None)),
// Recurse and checks for some compound types.
Adt(adt_def, substs) if !adt_def.is_union() => { Adt(adt_def, substs) if !adt_def.is_union() => {
// First check f this ADT has a layout attribute (like `NonNull` and friends).
use std::ops::Bound;
match tcx.layout_scalar_valid_range(adt_def.did) {
// We exploit here that `layout_scalar_valid_range` will never
// return `Bound::Excluded`. (And we have tests checking that we
// handle the attribute correctly.)
(Bound::Included(lo), _) if lo > 0 =>
return Some((format!("{} must be non-null", ty), None)),
(Bound::Included(_), _) | (_, Bound::Included(_))
if init == InitKind::Uninit =>
return Some((
format!("{} must be initialized inside its custom valid range", ty),
None,
)),
_ => {}
}
// Now, recurse.
match adt_def.variants.len() { match adt_def.variants.len() {
0 => Some((format!("0-variant enums have no valid value"), None)), 0 => Some((format!("0-variant enums have no valid value"), None)),
1 => { 1 => {
@ -1905,6 +1981,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
ty_find_init_error( ty_find_init_error(
tcx, tcx,
field.ty(tcx, substs), field.ty(tcx, substs),
init,
).map(|(mut msg, span)| if span.is_none() { ).map(|(mut msg, span)| if span.is_none() {
// Point to this field, should be helpful for figuring // Point to this field, should be helpful for figuring
// out where the source of the error is. // out where the source of the error is.
@ -1918,57 +1995,48 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
}) })
}) })
} }
// Multi-variant enums are tricky: if all but one variant are
// uninhabited, we might actually do layout like for a single-variant
// enum, and then even leaving them uninitialized could be okay.
_ => None, // Conservative fallback for multi-variant enum. _ => None, // Conservative fallback for multi-variant enum.
} }
} }
Tuple(..) => { Tuple(..) => {
// Proceed recursively, check all fields. // Proceed recursively, check all fields.
ty.tuple_fields().find_map(|field| ty_find_init_error(tcx, field)) ty.tuple_fields().find_map(|field| ty_find_init_error(tcx, field, init))
} }
// FIXME: Would be nice to also warn for `NonNull`/`NonZero*`.
// FIXME: *Only for `mem::uninitialized`*, we could also warn for `bool`,
// `char`, and any multivariant enum.
// Conservative fallback. // Conservative fallback.
_ => None, _ => None,
} }
} }
if let hir::ExprKind::Call(ref path_expr, ref _args) = expr.node { if let Some(init) = is_dangerous_init(cx, expr) {
if let hir::ExprKind::Path(ref qpath) = path_expr.node { // This conjures an instance of a type out of nothing,
if let Some(def_id) = cx.tables.qpath_res(qpath, path_expr.hir_id).opt_def_id() { // using zeroed or uninitialized memory.
if cx.match_def_path(def_id, &ZEROED_PATH) || // We are extremely conservative with what we warn about.
cx.match_def_path(def_id, &UININIT_PATH) let conjured_ty = cx.tables.expr_ty(expr);
{ if let Some((msg, span)) = ty_find_init_error(cx.tcx, conjured_ty, init) {
// This conjures an instance of a type out of nothing, let mut err = cx.struct_span_lint(
// using zeroed or uninitialized memory. INVALID_VALUE,
// We are extremely conservative with what we warn about. expr.span,
let conjured_ty = cx.tables.expr_ty(expr); &format!(
if let Some((msg, span)) = ty_find_init_error(cx.tcx, conjured_ty) { "the type `{}` does not permit {}",
let mut err = cx.struct_span_lint( conjured_ty,
INVALID_VALUE, match init {
expr.span, InitKind::Zeroed => "zero-initialization",
&format!( InitKind::Uninit => "being left uninitialized",
"the type `{}` does not permit {}", },
conjured_ty, ),
if cx.match_def_path(def_id, &ZEROED_PATH) { );
"zero-initialization" err.span_label(expr.span,
} else { "this code causes undefined behavior when executed");
"being left uninitialized" err.span_label(expr.span, "help: use `MaybeUninit<T>` instead");
} if let Some(span) = span {
), err.span_note(span, &msg);
); } else {
err.span_label(expr.span, err.note(&msg);
"this code causes undefined behavior when executed");
err.span_label(expr.span, "help: use `MaybeUninit<T>` instead");
if let Some(span) = span {
err.span_note(span, &msg);
} else {
err.note(&msg);
}
err.emit();
}
}
} }
err.emit();
} }
} }
} }

2
src/librustc_mir/interpret/memory.rs
View file

@ -297,7 +297,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
/// and `align`. On success, returns `None` for zero-sized accesses (where /// and `align`. On success, returns `None` for zero-sized accesses (where
/// nothing else is left to do) and a `Pointer` to use for the actual access otherwise. /// nothing else is left to do) and a `Pointer` to use for the actual access otherwise.
/// Crucially, if the input is a `Pointer`, we will test it for liveness /// Crucially, if the input is a `Pointer`, we will test it for liveness
/// *even of* the size is 0. /// *even if* the size is 0.
/// ///
/// Everyone accessing memory based on a `Scalar` should use this method to get the /// Everyone accessing memory based on a `Scalar` should use this method to get the
/// `Pointer` they need. And even if you already have a `Pointer`, call this method /// `Pointer` they need. And even if you already have a `Pointer`, call this method

23
src/librustc_resolve/build_reduced_graph.rs
View file

@ -160,12 +160,25 @@ impl<'a> Resolver<'a> {
Some(ext) Some(ext)
} }
// FIXME: `extra_placeholders` should be included into the `fragment` as regular placeholders.
crate fn build_reduced_graph( crate fn build_reduced_graph(
&mut self, fragment: &AstFragment, parent_scope: ParentScope<'a> &mut self,
fragment: &AstFragment,
extra_placeholders: &[NodeId],
parent_scope: ParentScope<'a>,
) -> LegacyScope<'a> { ) -> LegacyScope<'a> {
fragment.visit_with(&mut DefCollector::new(&mut self.definitions, parent_scope.expansion)); let mut def_collector = DefCollector::new(&mut self.definitions, parent_scope.expansion);
fragment.visit_with(&mut def_collector);
for placeholder in extra_placeholders {
def_collector.visit_macro_invoc(*placeholder);
}
let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope }; let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope };
fragment.visit_with(&mut visitor); fragment.visit_with(&mut visitor);
for placeholder in extra_placeholders {
visitor.parent_scope.legacy = visitor.visit_invoc(*placeholder);
}
visitor.parent_scope.legacy visitor.parent_scope.legacy
} }
@ -871,7 +884,7 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
} }
/// Builds the reduced graph for a single item in an external crate. /// Builds the reduced graph for a single item in an external crate.
fn build_reduced_graph_for_external_crate_res(&mut self, child: Export<ast::NodeId>) { fn build_reduced_graph_for_external_crate_res(&mut self, child: Export<NodeId>) {
let parent = self.parent_scope.module; let parent = self.parent_scope.module;
let Export { ident, res, vis, span } = child; let Export { ident, res, vis, span } = child;
// FIXME: We shouldn't create the gensym here, it should come from metadata, // FIXME: We shouldn't create the gensym here, it should come from metadata,
@ -1060,10 +1073,10 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
false false
} }
fn visit_invoc(&mut self, id: ast::NodeId) -> LegacyScope<'a> { fn visit_invoc(&mut self, id: NodeId) -> LegacyScope<'a> {
let invoc_id = id.placeholder_to_expn_id(); let invoc_id = id.placeholder_to_expn_id();
self.parent_scope.module.unresolved_invocations.borrow_mut().insert(invoc_id); self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id);
let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope); let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope);
assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation"); assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation");

4
src/librustc_resolve/lib.rs
View file

@ -448,7 +448,7 @@ pub struct ModuleData<'a> {
populate_on_access: Cell<bool>, populate_on_access: Cell<bool>,
// Macro invocations that can expand into items in this module. // Macro invocations that can expand into items in this module.
unresolved_invocations: RefCell<FxHashSet<ExpnId>>, unexpanded_invocations: RefCell<FxHashSet<ExpnId>>,
no_implicit_prelude: bool, no_implicit_prelude: bool,
@ -478,7 +478,7 @@ impl<'a> ModuleData<'a> {
normal_ancestor_id, normal_ancestor_id,
lazy_resolutions: Default::default(), lazy_resolutions: Default::default(),
populate_on_access: Cell::new(!normal_ancestor_id.is_local()), populate_on_access: Cell::new(!normal_ancestor_id.is_local()),
unresolved_invocations: Default::default(), unexpanded_invocations: Default::default(),
no_implicit_prelude: false, no_implicit_prelude: false,
glob_importers: RefCell::new(Vec::new()), glob_importers: RefCell::new(Vec::new()),
globs: RefCell::new(Vec::new()), globs: RefCell::new(Vec::new()),

31
src/librustc_resolve/macros.rs
View file

@ -10,7 +10,7 @@ use crate::resolve_imports::ImportResolver;
use rustc::hir::def::{self, DefKind, NonMacroAttrKind}; use rustc::hir::def::{self, DefKind, NonMacroAttrKind};
use rustc::middle::stability; use rustc::middle::stability;
use rustc::{ty, lint, span_bug}; use rustc::{ty, lint, span_bug};
use syntax::ast::{self, Ident}; use syntax::ast::{self, NodeId, Ident};
use syntax::attr::StabilityLevel; use syntax::attr::StabilityLevel;
use syntax::edition::Edition; use syntax::edition::Edition;
use syntax::ext::base::{self, Indeterminate, SpecialDerives}; use syntax::ext::base::{self, Indeterminate, SpecialDerives};
@ -26,7 +26,7 @@ use syntax_pos::{Span, DUMMY_SP};
use std::{mem, ptr}; use std::{mem, ptr};
use rustc_data_structures::sync::Lrc; use rustc_data_structures::sync::Lrc;
type Res = def::Res<ast::NodeId>; type Res = def::Res<NodeId>;
/// Binding produced by a `macro_rules` item. /// Binding produced by a `macro_rules` item.
/// Not modularized, can shadow previous legacy bindings, etc. /// Not modularized, can shadow previous legacy bindings, etc.
@ -91,11 +91,11 @@ fn fast_print_path(path: &ast::Path) -> Symbol {
} }
impl<'a> base::Resolver for Resolver<'a> { impl<'a> base::Resolver for Resolver<'a> {
fn next_node_id(&mut self) -> ast::NodeId { fn next_node_id(&mut self) -> NodeId {
self.session.next_node_id() self.session.next_node_id()
} }
fn get_module_scope(&mut self, id: ast::NodeId) -> ExpnId { fn get_module_scope(&mut self, id: NodeId) -> ExpnId {
let expn_id = ExpnId::fresh(Some(ExpnData::default( let expn_id = ExpnId::fresh(Some(ExpnData::default(
ExpnKind::Macro(MacroKind::Attr, sym::test_case), DUMMY_SP, self.session.edition() ExpnKind::Macro(MacroKind::Attr, sym::test_case), DUMMY_SP, self.session.edition()
))); )));
@ -115,23 +115,18 @@ impl<'a> base::Resolver for Resolver<'a> {
}); });
} }
// FIXME: `extra_placeholders` should be included into the `fragment` as regular placeholders.
fn visit_ast_fragment_with_placeholders( fn visit_ast_fragment_with_placeholders(
&mut self, expansion: ExpnId, fragment: &AstFragment, derives: &[ExpnId] &mut self, expansion: ExpnId, fragment: &AstFragment, extra_placeholders: &[NodeId]
) { ) {
// Fill in some data for derives if the fragment is from a derive container. // Integrate the new AST fragment into all the definition and module structures.
// We are inside the `expansion` now, but other parent scope components are still the same. // We are inside the `expansion` now, but other parent scope components are still the same.
let parent_scope = ParentScope { expansion, ..self.invocation_parent_scopes[&expansion] }; let parent_scope = ParentScope { expansion, ..self.invocation_parent_scopes[&expansion] };
let parent_def = self.definitions.invocation_parent(expansion); let output_legacy_scope =
self.invocation_parent_scopes.extend(derives.iter().map(|&derive| (derive, parent_scope))); self.build_reduced_graph(fragment, extra_placeholders, parent_scope);
for &derive_invoc_id in derives {
self.definitions.set_invocation_parent(derive_invoc_id, parent_def);
}
parent_scope.module.unresolved_invocations.borrow_mut().remove(&expansion);
parent_scope.module.unresolved_invocations.borrow_mut().extend(derives);
// Integrate the new AST fragment into all the definition and module structures.
let output_legacy_scope = self.build_reduced_graph(fragment, parent_scope);
self.output_legacy_scopes.insert(expansion, output_legacy_scope); self.output_legacy_scopes.insert(expansion, output_legacy_scope);
parent_scope.module.unexpanded_invocations.borrow_mut().remove(&expansion);
} }
fn register_builtin_macro(&mut self, ident: ast::Ident, ext: SyntaxExtension) { fn register_builtin_macro(&mut self, ident: ast::Ident, ext: SyntaxExtension) {
@ -485,7 +480,7 @@ impl<'a> Resolver<'a> {
Scope::MacroUsePrelude => match this.macro_use_prelude.get(&ident.name).cloned() { Scope::MacroUsePrelude => match this.macro_use_prelude.get(&ident.name).cloned() {
Some(binding) => Ok((binding, Flags::PRELUDE | Flags::MISC_FROM_PRELUDE)), Some(binding) => Ok((binding, Flags::PRELUDE | Flags::MISC_FROM_PRELUDE)),
None => Err(Determinacy::determined( None => Err(Determinacy::determined(
this.graph_root.unresolved_invocations.borrow().is_empty() this.graph_root.unexpanded_invocations.borrow().is_empty()
)) ))
} }
Scope::BuiltinAttrs => if is_builtin_attr_name(ident.name) { Scope::BuiltinAttrs => if is_builtin_attr_name(ident.name) {
@ -508,7 +503,7 @@ impl<'a> Resolver<'a> {
Scope::ExternPrelude => match this.extern_prelude_get(ident, !record_used) { Scope::ExternPrelude => match this.extern_prelude_get(ident, !record_used) {
Some(binding) => Ok((binding, Flags::PRELUDE)), Some(binding) => Ok((binding, Flags::PRELUDE)),
None => Err(Determinacy::determined( None => Err(Determinacy::determined(
this.graph_root.unresolved_invocations.borrow().is_empty() this.graph_root.unexpanded_invocations.borrow().is_empty()
)), )),
} }
Scope::ToolPrelude => if KNOWN_TOOLS.contains(&ident.name) { Scope::ToolPrelude => if KNOWN_TOOLS.contains(&ident.name) {

4
src/librustc_resolve/resolve_imports.rs
View file

@ -202,7 +202,7 @@ impl<'a> Resolver<'a> {
Err((Determined, Weak::No)) Err((Determined, Weak::No))
} else if let Some(binding) = self.extern_prelude_get(ident, !record_used) { } else if let Some(binding) = self.extern_prelude_get(ident, !record_used) {
Ok(binding) Ok(binding)
} else if !self.graph_root.unresolved_invocations.borrow().is_empty() { } else if !self.graph_root.unexpanded_invocations.borrow().is_empty() {
// Macro-expanded `extern crate` items can add names to extern prelude. // Macro-expanded `extern crate` items can add names to extern prelude.
Err((Undetermined, Weak::No)) Err((Undetermined, Weak::No))
} else { } else {
@ -348,7 +348,7 @@ impl<'a> Resolver<'a> {
// progress, we have to ignore those potential unresolved invocations from other modules // progress, we have to ignore those potential unresolved invocations from other modules
// and prohibit access to macro-expanded `macro_export` macros instead (unless restricted // and prohibit access to macro-expanded `macro_export` macros instead (unless restricted
// shadowing is enabled, see `macro_expanded_macro_export_errors`). // shadowing is enabled, see `macro_expanded_macro_export_errors`).
let unexpanded_macros = !module.unresolved_invocations.borrow().is_empty(); let unexpanded_macros = !module.unexpanded_invocations.borrow().is_empty();
if let Some(binding) = resolution.binding { if let Some(binding) = resolution.binding {
if !unexpanded_macros || ns == MacroNS || restricted_shadowing { if !unexpanded_macros || ns == MacroNS || restricted_shadowing {
return check_usable(self, binding); return check_usable(self, binding);

8
src/libsyntax/ext/base.rs
View file

@ -1,4 +1,4 @@
use crate::ast::{self, Attribute, Name, PatKind}; use crate::ast::{self, NodeId, Attribute, Name, PatKind};
use crate::attr::{HasAttrs, Stability, Deprecation}; use crate::attr::{HasAttrs, Stability, Deprecation};
use crate::source_map::SourceMap; use crate::source_map::SourceMap;
use crate::edition::Edition; use crate::edition::Edition;
@ -671,13 +671,13 @@ bitflags::bitflags! {
} }
pub trait Resolver { pub trait Resolver {
fn next_node_id(&mut self) -> ast::NodeId; fn next_node_id(&mut self) -> NodeId;
fn get_module_scope(&mut self, id: ast::NodeId) -> ExpnId; fn get_module_scope(&mut self, id: NodeId) -> ExpnId;
fn resolve_dollar_crates(&mut self); fn resolve_dollar_crates(&mut self);
fn visit_ast_fragment_with_placeholders(&mut self, expn_id: ExpnId, fragment: &AstFragment, fn visit_ast_fragment_with_placeholders(&mut self, expn_id: ExpnId, fragment: &AstFragment,
derives: &[ExpnId]); extra_placeholders: &[NodeId]);
fn register_builtin_macro(&mut self, ident: ast::Ident, ext: SyntaxExtension); fn register_builtin_macro(&mut self, ident: ast::Ident, ext: SyntaxExtension);
fn resolve_imports(&mut self); fn resolve_imports(&mut self);

25
src/libsyntax/ext/expand.rs
View file

@ -291,7 +291,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
// Unresolved macros produce dummy outputs as a recovery measure. // Unresolved macros produce dummy outputs as a recovery measure.
invocations.reverse(); invocations.reverse();
let mut expanded_fragments = Vec::new(); let mut expanded_fragments = Vec::new();
let mut derives: FxHashMap<ExpnId, Vec<_>> = FxHashMap::default(); let mut all_derive_placeholders: FxHashMap<ExpnId, Vec<_>> = FxHashMap::default();
let mut undetermined_invocations = Vec::new(); let mut undetermined_invocations = Vec::new();
let (mut progress, mut force) = (false, !self.monotonic); let (mut progress, mut force) = (false, !self.monotonic);
loop { loop {
@ -347,13 +347,14 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
let mut item = self.fully_configure(item); let mut item = self.fully_configure(item);
item.visit_attrs(|attrs| attrs.retain(|a| a.path != sym::derive)); item.visit_attrs(|attrs| attrs.retain(|a| a.path != sym::derive));
let derives = derives.entry(invoc.expansion_data.id).or_default(); let derive_placeholders =
all_derive_placeholders.entry(invoc.expansion_data.id).or_default();
derives.reserve(traits.len()); derive_placeholders.reserve(traits.len());
invocations.reserve(traits.len()); invocations.reserve(traits.len());
for path in traits { for path in traits {
let expn_id = ExpnId::fresh(None); let expn_id = ExpnId::fresh(None);
derives.push(expn_id); derive_placeholders.push(NodeId::placeholder_from_expn_id(expn_id));
invocations.push(Invocation { invocations.push(Invocation {
kind: InvocationKind::Derive { path, item: item.clone() }, kind: InvocationKind::Derive { path, item: item.clone() },
fragment_kind: invoc.fragment_kind, fragment_kind: invoc.fragment_kind,
@ -365,7 +366,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
} }
let fragment = invoc.fragment_kind let fragment = invoc.fragment_kind
.expect_from_annotatables(::std::iter::once(item)); .expect_from_annotatables(::std::iter::once(item));
self.collect_invocations(fragment, derives) self.collect_invocations(fragment, derive_placeholders)
} else { } else {
unreachable!() unreachable!()
}; };
@ -384,10 +385,11 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
// Finally incorporate all the expanded macros into the input AST fragment. // Finally incorporate all the expanded macros into the input AST fragment.
let mut placeholder_expander = PlaceholderExpander::new(self.cx, self.monotonic); let mut placeholder_expander = PlaceholderExpander::new(self.cx, self.monotonic);
while let Some(expanded_fragments) = expanded_fragments.pop() { while let Some(expanded_fragments) = expanded_fragments.pop() {
for (mark, expanded_fragment) in expanded_fragments.into_iter().rev() { for (expn_id, expanded_fragment) in expanded_fragments.into_iter().rev() {
let derives = derives.remove(&mark).unwrap_or_else(Vec::new); let derive_placeholders =
placeholder_expander.add(NodeId::placeholder_from_expn_id(mark), all_derive_placeholders.remove(&expn_id).unwrap_or_else(Vec::new);
expanded_fragment, derives); placeholder_expander.add(NodeId::placeholder_from_expn_id(expn_id),
expanded_fragment, derive_placeholders);
} }
} }
fragment_with_placeholders.mut_visit_with(&mut placeholder_expander); fragment_with_placeholders.mut_visit_with(&mut placeholder_expander);
@ -404,7 +406,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
/// them with "placeholders" - dummy macro invocations with specially crafted `NodeId`s. /// them with "placeholders" - dummy macro invocations with specially crafted `NodeId`s.
/// Then call into resolver that builds a skeleton ("reduced graph") of the fragment and /// Then call into resolver that builds a skeleton ("reduced graph") of the fragment and
/// prepares data for resolving paths of macro invocations. /// prepares data for resolving paths of macro invocations.
fn collect_invocations(&mut self, mut fragment: AstFragment, derives: &[ExpnId]) fn collect_invocations(&mut self, mut fragment: AstFragment, extra_placeholders: &[NodeId])
-> (AstFragment, Vec<Invocation>) { -> (AstFragment, Vec<Invocation>) {
// Resolve `$crate`s in the fragment for pretty-printing. // Resolve `$crate`s in the fragment for pretty-printing.
self.cx.resolver.resolve_dollar_crates(); self.cx.resolver.resolve_dollar_crates();
@ -423,9 +425,10 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
collector.invocations collector.invocations
}; };
// FIXME: Merge `extra_placeholders` into the `fragment` as regular placeholders.
if self.monotonic { if self.monotonic {
self.cx.resolver.visit_ast_fragment_with_placeholders( self.cx.resolver.visit_ast_fragment_with_placeholders(
self.cx.current_expansion.id, &fragment, derives); self.cx.current_expansion.id, &fragment, extra_placeholders);
} }
(fragment, invocations) (fragment, invocations)

7
src/libsyntax/ext/placeholders.rs
View file

@ -2,7 +2,6 @@ use crate::ast::{self, NodeId};
use crate::source_map::{DUMMY_SP, dummy_spanned}; use crate::source_map::{DUMMY_SP, dummy_spanned};
use crate::ext::base::ExtCtxt; use crate::ext::base::ExtCtxt;
use crate::ext::expand::{AstFragment, AstFragmentKind}; use crate::ext::expand::{AstFragment, AstFragmentKind};
use crate::ext::hygiene::ExpnId;
use crate::tokenstream::TokenStream; use crate::tokenstream::TokenStream;
use crate::mut_visit::*; use crate::mut_visit::*;
use crate::ptr::P; use crate::ptr::P;
@ -86,11 +85,11 @@ impl<'a, 'b> PlaceholderExpander<'a, 'b> {
} }
} }
pub fn add(&mut self, id: ast::NodeId, mut fragment: AstFragment, derives: Vec<ExpnId>) { pub fn add(&mut self, id: ast::NodeId, mut fragment: AstFragment, placeholders: Vec<NodeId>) {
fragment.mut_visit_with(self); fragment.mut_visit_with(self);
if let AstFragment::Items(mut items) = fragment { if let AstFragment::Items(mut items) = fragment {
for derive in derives { for placeholder in placeholders {
match self.remove(NodeId::placeholder_from_expn_id(derive)) { match self.remove(placeholder) {
AstFragment::Items(derived_items) => items.extend(derived_items), AstFragment::Items(derived_items) => items.extend(derived_items),
_ => unreachable!(), _ => unreachable!(),
} }

2
src/test/pretty/stmt_expr_attributes.rs
View file

@ -259,8 +259,6 @@ fn _12() {
} }
} }
/////////////////
fn foo() { } fn foo() { }
fn foo3(_: i32, _: (), _: ()) { } fn foo3(_: i32, _: (), _: ()) { }
fn qux(_: i32) { } fn qux(_: i32) { }

8
src/test/ui/associated-type/associated-type-projection-from-supertrait.rs
View file

@ -12,30 +12,22 @@ pub trait Car : Vehicle {
fn chip_paint(&self, c: Self::Color) { } fn chip_paint(&self, c: Self::Color) { }
} }
///////////////////////////////////////////////////////////////////////////
struct Black; struct Black;
struct ModelT; struct ModelT;
impl Vehicle for ModelT { type Color = Black; } impl Vehicle for ModelT { type Color = Black; }
impl Car for ModelT { } impl Car for ModelT { }
///////////////////////////////////////////////////////////////////////////
struct Blue; struct Blue;
struct ModelU; struct ModelU;
impl Vehicle for ModelU { type Color = Blue; } impl Vehicle for ModelU { type Color = Blue; }
impl Car for ModelU { } impl Car for ModelU { }
///////////////////////////////////////////////////////////////////////////
fn dent<C:Car>(c: C, color: C::Color) { c.chip_paint(color) } fn dent<C:Car>(c: C, color: C::Color) { c.chip_paint(color) }
fn a() { dent(ModelT, Black); } fn a() { dent(ModelT, Black); }
fn b() { dent(ModelT, Blue); } //~ ERROR mismatched types fn b() { dent(ModelT, Blue); } //~ ERROR mismatched types
fn c() { dent(ModelU, Black); } //~ ERROR mismatched types fn c() { dent(ModelU, Black); } //~ ERROR mismatched types
fn d() { dent(ModelU, Blue); } fn d() { dent(ModelU, Blue); }
///////////////////////////////////////////////////////////////////////////
fn e() { ModelT.chip_paint(Black); } fn e() { ModelT.chip_paint(Black); }
fn f() { ModelT.chip_paint(Blue); } //~ ERROR mismatched types fn f() { ModelT.chip_paint(Blue); } //~ ERROR mismatched types
fn g() { ModelU.chip_paint(Black); } //~ ERROR mismatched types fn g() { ModelU.chip_paint(Black); } //~ ERROR mismatched types

8
src/test/ui/associated-type/associated-type-projection-from-supertrait.stderr
View file

@ -1,5 +1,5 @@
error[E0308]: mismatched types error[E0308]: mismatched types
--> $DIR/associated-type-projection-from-supertrait.rs:33:23 --> $DIR/associated-type-projection-from-supertrait.rs:27:23
| |
LL | fn b() { dent(ModelT, Blue); } LL | fn b() { dent(ModelT, Blue); }
| ^^^^ expected struct `Black`, found struct `Blue` | ^^^^ expected struct `Black`, found struct `Blue`
@ -8,7 +8,7 @@ LL | fn b() { dent(ModelT, Blue); }
found type `Blue` found type `Blue`
error[E0308]: mismatched types error[E0308]: mismatched types
--> $DIR/associated-type-projection-from-supertrait.rs:34:23 --> $DIR/associated-type-projection-from-supertrait.rs:28:23
| |
LL | fn c() { dent(ModelU, Black); } LL | fn c() { dent(ModelU, Black); }
| ^^^^^ expected struct `Blue`, found struct `Black` | ^^^^^ expected struct `Blue`, found struct `Black`
@ -17,7 +17,7 @@ LL | fn c() { dent(ModelU, Black); }
found type `Black` found type `Black`
error[E0308]: mismatched types error[E0308]: mismatched types
--> $DIR/associated-type-projection-from-supertrait.rs:40:28 --> $DIR/associated-type-projection-from-supertrait.rs:32:28
| |
LL | fn f() { ModelT.chip_paint(Blue); } LL | fn f() { ModelT.chip_paint(Blue); }
| ^^^^ expected struct `Black`, found struct `Blue` | ^^^^ expected struct `Black`, found struct `Blue`
@ -26,7 +26,7 @@ LL | fn f() { ModelT.chip_paint(Blue); }
found type `Blue` found type `Blue`
error[E0308]: mismatched types error[E0308]: mismatched types
--> $DIR/associated-type-projection-from-supertrait.rs:41:28 --> $DIR/associated-type-projection-from-supertrait.rs:33:28
| |
LL | fn g() { ModelU.chip_paint(Black); } LL | fn g() { ModelU.chip_paint(Black); }
| ^^^^^ expected struct `Blue`, found struct `Black` | ^^^^^ expected struct `Blue`, found struct `Black`

6
src/test/ui/associated-types/associated-types-binding-to-type-defined-in-supertrait.rs
View file

@ -11,22 +11,16 @@ pub trait Car : Vehicle {
fn honk(&self) { } fn honk(&self) { }
} }
///////////////////////////////////////////////////////////////////////////
struct Black; struct Black;
struct ModelT; struct ModelT;
impl Vehicle for ModelT { type Color = Black; } impl Vehicle for ModelT { type Color = Black; }
impl Car for ModelT { } impl Car for ModelT { }
///////////////////////////////////////////////////////////////////////////
struct Blue; struct Blue;
struct ModelU; struct ModelU;
impl Vehicle for ModelU { type Color = Blue; } impl Vehicle for ModelU { type Color = Blue; }
impl Car for ModelU { } impl Car for ModelU { }
///////////////////////////////////////////////////////////////////////////
fn black_car<C:Car<Color=Black>>(c: C) { fn black_car<C:Car<Color=Black>>(c: C) {
} }

8
src/test/ui/associated-types/associated-types-binding-to-type-defined-in-supertrait.stderr
View file

@ -1,5 +1,5 @@
error[E0271]: type mismatch resolving `<ModelT as Vehicle>::Color == Blue` error[E0271]: type mismatch resolving `<ModelT as Vehicle>::Color == Blue`
--> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:37:10 --> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:31:10
| |
LL | fn b() { blue_car(ModelT); } LL | fn b() { blue_car(ModelT); }
| ^^^^^^^^ expected struct `Black`, found struct `Blue` | ^^^^^^^^ expected struct `Black`, found struct `Blue`
@ -7,13 +7,13 @@ LL | fn b() { blue_car(ModelT); }
= note: expected type `Black` = note: expected type `Black`
found type `Blue` found type `Blue`
note: required by `blue_car` note: required by `blue_car`
--> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:33:1 --> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:27:1
| |
LL | fn blue_car<C:Car<Color=Blue>>(c: C) { LL | fn blue_car<C:Car<Color=Blue>>(c: C) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0271]: type mismatch resolving `<ModelU as Vehicle>::Color == Black` error[E0271]: type mismatch resolving `<ModelU as Vehicle>::Color == Black`
--> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:38:10 --> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:32:10
| |
LL | fn c() { black_car(ModelU); } LL | fn c() { black_car(ModelU); }
| ^^^^^^^^^ expected struct `Blue`, found struct `Black` | ^^^^^^^^^ expected struct `Blue`, found struct `Black`
@ -21,7 +21,7 @@ LL | fn c() { black_car(ModelU); }
= note: expected type `Blue` = note: expected type `Blue`
found type `Black` found type `Black`
note: required by `black_car` note: required by `black_car`
--> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:30:1 --> $DIR/associated-types-binding-to-type-defined-in-supertrait.rs:24:1
| |
LL | fn black_car<C:Car<Color=Black>>(c: C) { LL | fn black_car<C:Car<Color=Black>>(c: C) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

4
src/test/ui/associated-types/associated-types-ref-from-struct.rs
View file

@ -9,8 +9,6 @@ trait Test {
fn test(&self, value: &Self::V) -> bool; fn test(&self, value: &Self::V) -> bool;
} }
///////////////////////////////////////////////////////////////////////////
struct TesterPair<T:Test> { struct TesterPair<T:Test> {
tester: T, tester: T,
value: T::V, value: T::V,
@ -26,8 +24,6 @@ impl<T:Test> TesterPair<T> {
} }
} }
///////////////////////////////////////////////////////////////////////////
struct EqU32(u32); struct EqU32(u32);
impl Test for EqU32 { impl Test for EqU32 {
type V = u32; type V = u32;

2
src/test/ui/consts/const-eval/ub-nonnull.rs
View file

@ -1,5 +1,5 @@
#![feature(rustc_attrs, const_transmute)] #![feature(rustc_attrs, const_transmute)]
#![allow(const_err)] // make sure we cannot allow away the errors tested here #![allow(const_err, invalid_value)] // make sure we cannot allow away the errors tested here
use std::mem; use std::mem;
use std::ptr::NonNull; use std::ptr::NonNull;

2
src/test/ui/consts/const-eval/ub-ref.rs
View file

@ -1,6 +1,6 @@
// ignore-tidy-linelength // ignore-tidy-linelength
#![feature(const_transmute)] #![feature(const_transmute)]
#![allow(const_err)] // make sure we cannot allow away the errors tested here #![allow(const_err, invalid_value)] // make sure we cannot allow away the errors tested here
use std::mem; use std::mem;

2
src/test/ui/consts/const-eval/ub-upvars.rs
View file

@ -1,5 +1,5 @@
#![feature(const_transmute)] #![feature(const_transmute)]
#![allow(const_err)] // make sure we cannot allow away the errors tested here #![allow(const_err, invalid_value)] // make sure we cannot allow away the errors tested here
use std::mem; use std::mem;

2
src/test/ui/higher-rank-trait-bounds/hrtb-type-outlives.rs
View file

@ -14,7 +14,6 @@ fn want_foo<T>()
{ {
} }
///////////////////////////////////////////////////////////////////////////
// Expressed as a where clause // Expressed as a where clause
struct SomeStruct<X> { struct SomeStruct<X> {
@ -30,7 +29,6 @@ fn one() {
want_foo::<SomeStruct<usize>>(); want_foo::<SomeStruct<usize>>();
} }
///////////////////////////////////////////////////////////////////////////
// Expressed as shorthand // Expressed as shorthand
struct AnotherStruct<X> { struct AnotherStruct<X> {

1
src/test/ui/hrtb/hrtb-conflate-regions.rs
View file

@ -15,7 +15,6 @@ fn want_foo1<T>()
{ {
} }
///////////////////////////////////////////////////////////////////////////
// Expressed as a where clause // Expressed as a where clause
struct SomeStruct; struct SomeStruct;

2
src/test/ui/hrtb/hrtb-conflate-regions.stderr
View file

@ -1,5 +1,5 @@
error[E0277]: the trait bound `for<'a, 'b> SomeStruct: Foo<(&'a isize, &'b isize)>` is not satisfied error[E0277]: the trait bound `for<'a, 'b> SomeStruct: Foo<(&'a isize, &'b isize)>` is not satisfied
--> $DIR/hrtb-conflate-regions.rs:28:10 --> $DIR/hrtb-conflate-regions.rs:27:10
| |
LL | fn b() { want_foo2::<SomeStruct>(); } LL | fn b() { want_foo2::<SomeStruct>(); }
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `for<'a, 'b> Foo<(&'a isize, &'b isize)>` is not implemented for `SomeStruct` | ^^^^^^^^^^^^^^^^^^^^^^^ the trait `for<'a, 'b> Foo<(&'a isize, &'b isize)>` is not implemented for `SomeStruct`

2
src/test/ui/impl-trait/bound-normalization-fail.rs
View file

@ -8,7 +8,6 @@
// See issue 60414 // See issue 60414
/////////////////////////////////////////////
// Reduction to `impl Trait` // Reduction to `impl Trait`
struct Foo<T>(T); struct Foo<T>(T);
@ -33,7 +32,6 @@ mod impl_trait {
} }
} }
/////////////////////////////////////////////
// Same with lifetimes in the trait // Same with lifetimes in the trait
mod lifetimes { mod lifetimes {

6
src/test/ui/impl-trait/bound-normalization-fail.stderr
View file

@ -7,7 +7,7 @@ LL | #![feature(impl_trait_in_bindings)]
= note: `#[warn(incomplete_features)]` on by default = note: `#[warn(incomplete_features)]` on by default
error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as impl_trait::Trait>::Assoc` error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as impl_trait::Trait>::Assoc`
--> $DIR/bound-normalization-fail.rs:30:32 --> $DIR/bound-normalization-fail.rs:29:32
| |
LL | fn foo_fail<T: Trait>() -> impl FooLike<Output=T::Assoc> { LL | fn foo_fail<T: Trait>() -> impl FooLike<Output=T::Assoc> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected (), found associated type | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected (), found associated type
@ -17,13 +17,13 @@ LL | fn foo_fail<T: Trait>() -> impl FooLike<Output=T::Assoc> {
= note: the return type of a function must have a statically known size = note: the return type of a function must have a statically known size
error: `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope error: `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
--> $DIR/bound-normalization-fail.rs:47:41 --> $DIR/bound-normalization-fail.rs:45:41
| |
LL | fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> { LL | fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as lifetimes::Trait<'static>>::Assoc` error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as lifetimes::Trait<'static>>::Assoc`
--> $DIR/bound-normalization-fail.rs:47:41 --> $DIR/bound-normalization-fail.rs:45:41
| |
LL | fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> { LL | fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected (), found associated type | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected (), found associated type

4
src/test/ui/impl-trait/bound-normalization-pass.rs
View file

@ -8,7 +8,6 @@
// See issue 60414 // See issue 60414
/////////////////////////////////////////////
// Reduction to `impl Trait` // Reduction to `impl Trait`
struct Foo<T>(T); struct Foo<T>(T);
@ -32,7 +31,6 @@ mod impl_trait {
} }
} }
/////////////////////////////////////////////
// Same with lifetimes in the trait // Same with lifetimes in the trait
mod lifetimes { mod lifetimes {
@ -59,7 +57,6 @@ mod lifetimes {
} }
} }
/////////////////////////////////////////////
// Reduction using `impl Trait` in bindings // Reduction using `impl Trait` in bindings
mod impl_trait_in_bindings { mod impl_trait_in_bindings {
@ -80,7 +77,6 @@ mod impl_trait_in_bindings {
} }
} }
/////////////////////////////////////////////
// The same applied to `type Foo = impl Bar`s // The same applied to `type Foo = impl Bar`s
mod opaque_types { mod opaque_types {

2
src/test/ui/issues/issue-12028.rs
View file

@ -17,8 +17,6 @@ trait StreamHasher {
fn stream(&self) -> Self::S; fn stream(&self) -> Self::S;
} }
//////////////////////////////////////////////////////////////////////////////
trait StreamHash<H: StreamHasher>: Hash<H> { trait StreamHash<H: StreamHasher>: Hash<H> {
fn input_stream(&self, stream: &mut H::S); fn input_stream(&self, stream: &mut H::S);
} }

2
src/test/ui/issues/issue-12028.stderr
View file

@ -1,5 +1,5 @@
error[E0284]: type annotations required: cannot resolve `<_ as StreamHasher>::S == <H as StreamHasher>::S` error[E0284]: type annotations required: cannot resolve `<_ as StreamHasher>::S == <H as StreamHasher>::S`
--> $DIR/issue-12028.rs:29:14 --> $DIR/issue-12028.rs:27:14
| |
LL | self.input_stream(&mut stream); LL | self.input_stream(&mut stream);
| ^^^^^^^^^^^^ | ^^^^^^^^^^^^

4
src/test/ui/issues/issue-16739.rs
View file

@ -16,8 +16,6 @@ impl FnOnce<()> for Foo {
extern "rust-call" fn call_once(mut self, _: ()) -> u32 { self.call_mut(()) } extern "rust-call" fn call_once(mut self, _: ()) -> u32 { self.call_mut(()) }
} }
/////////////////////////////////////////////////////////////////////////
impl FnMut<(u32,)> for Foo { impl FnMut<(u32,)> for Foo {
extern "rust-call" fn call_mut(&mut self, (x,): (u32,)) -> u32 { self.foo + x } extern "rust-call" fn call_mut(&mut self, (x,): (u32,)) -> u32 { self.foo + x }
} }
@ -27,8 +25,6 @@ impl FnOnce<(u32,)> for Foo {
extern "rust-call" fn call_once(mut self, args: (u32,)) -> u32 { self.call_mut(args) } extern "rust-call" fn call_once(mut self, args: (u32,)) -> u32 { self.call_mut(args) }
} }
/////////////////////////////////////////////////////////////////////////
impl FnMut<(u32,u32)> for Foo { impl FnMut<(u32,u32)> for Foo {
extern "rust-call" fn call_mut(&mut self, (x, y): (u32, u32)) -> u32 { self.foo + x + y } extern "rust-call" fn call_mut(&mut self, (x, y): (u32, u32)) -> u32 { self.foo + x + y }
} }

31
src/test/ui/lint/uninitialized-zeroed.rs
View file

@ -2,11 +2,13 @@
// This test checks that calling `mem::{uninitialized,zeroed}` with certain types results // This test checks that calling `mem::{uninitialized,zeroed}` with certain types results
// in a lint. // in a lint.
#![feature(never_type)] #![feature(never_type, rustc_attrs)]
#![allow(deprecated)] #![allow(deprecated)]
#![deny(invalid_value)] #![deny(invalid_value)]
use std::mem::{self, MaybeUninit}; use std::mem::{self, MaybeUninit};
use std::ptr::NonNull;
use std::num::NonZeroU32;
enum Void {} enum Void {}
@ -16,6 +18,11 @@ struct RefPair((&'static i32, i32));
struct Wrap<T> { wrapped: T } struct Wrap<T> { wrapped: T }
enum WrapEnum<T> { Wrapped(T) } enum WrapEnum<T> { Wrapped(T) }
#[rustc_layout_scalar_valid_range_start(0)]
#[rustc_layout_scalar_valid_range_end(128)]
#[repr(transparent)]
pub(crate) struct NonBig(u64);
#[allow(unused)] #[allow(unused)]
fn generic<T: 'static>() { fn generic<T: 'static>() {
unsafe { unsafe {
@ -29,6 +36,7 @@ fn generic<T: 'static>() {
fn main() { fn main() {
unsafe { unsafe {
// Things that cannot even be zero.
let _val: ! = mem::zeroed(); //~ ERROR: does not permit zero-initialization let _val: ! = mem::zeroed(); //~ ERROR: does not permit zero-initialization
let _val: ! = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized let _val: ! = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
@ -56,11 +64,28 @@ fn main() {
let _val: Wrap<(RefPair, i32)> = mem::zeroed(); //~ ERROR: does not permit zero-initialization let _val: Wrap<(RefPair, i32)> = mem::zeroed(); //~ ERROR: does not permit zero-initialization
let _val: Wrap<(RefPair, i32)> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized let _val: Wrap<(RefPair, i32)> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
// Some types that should work just fine. let _val: NonNull<i32> = mem::zeroed(); //~ ERROR: does not permit zero-initialization
let _val: NonNull<i32> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
// Things that can be zero, but not uninit.
let _val: bool = mem::zeroed();
let _val: bool = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
let _val: Wrap<char> = mem::zeroed();
let _val: Wrap<char> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
let _val: NonBig = mem::zeroed();
let _val: NonBig = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
// Transmute-from-0
let _val: &'static i32 = mem::transmute(0usize); //~ ERROR: does not permit zero-initialization
let _val: &'static [i32] = mem::transmute((0usize, 0usize)); //~ ERROR: does not permit zero-initialization
let _val: NonZeroU32 = mem::transmute(0); //~ ERROR: does not permit zero-initialization
// Some more types that should work just fine.
let _val: Option<&'static i32> = mem::zeroed(); let _val: Option<&'static i32> = mem::zeroed();
let _val: Option<fn()> = mem::zeroed(); let _val: Option<fn()> = mem::zeroed();
let _val: MaybeUninit<&'static i32> = mem::zeroed(); let _val: MaybeUninit<&'static i32> = mem::zeroed();
let _val: bool = mem::zeroed();
let _val: i32 = mem::zeroed(); let _val: i32 = mem::zeroed();
} }
} }

158
src/test/ui/lint/uninitialized-zeroed.stderr
View file

@ -1,5 +1,5 @@
error: the type `&'static T` does not permit zero-initialization error: the type `&'static T` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:22:32 --> $DIR/uninitialized-zeroed.rs:29:32
| |
LL | let _val: &'static T = mem::zeroed(); LL | let _val: &'static T = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -15,7 +15,7 @@ LL | #![deny(invalid_value)]
= note: References must be non-null = note: References must be non-null
error: the type `&'static T` does not permit being left uninitialized error: the type `&'static T` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:23:32 --> $DIR/uninitialized-zeroed.rs:30:32
| |
LL | let _val: &'static T = mem::uninitialized(); LL | let _val: &'static T = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -26,7 +26,7 @@ LL | let _val: &'static T = mem::uninitialized();
= note: References must be non-null = note: References must be non-null
error: the type `Wrap<&'static T>` does not permit zero-initialization error: the type `Wrap<&'static T>` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:25:38 --> $DIR/uninitialized-zeroed.rs:32:38
| |
LL | let _val: Wrap<&'static T> = mem::zeroed(); LL | let _val: Wrap<&'static T> = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -35,13 +35,13 @@ LL | let _val: Wrap<&'static T> = mem::zeroed();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: References must be non-null (in this struct field) note: References must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:16:18 --> $DIR/uninitialized-zeroed.rs:18:18
| |
LL | struct Wrap<T> { wrapped: T } LL | struct Wrap<T> { wrapped: T }
| ^^^^^^^^^^ | ^^^^^^^^^^
error: the type `Wrap<&'static T>` does not permit being left uninitialized error: the type `Wrap<&'static T>` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:26:38 --> $DIR/uninitialized-zeroed.rs:33:38
| |
LL | let _val: Wrap<&'static T> = mem::uninitialized(); LL | let _val: Wrap<&'static T> = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -50,13 +50,13 @@ LL | let _val: Wrap<&'static T> = mem::uninitialized();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: References must be non-null (in this struct field) note: References must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:16:18 --> $DIR/uninitialized-zeroed.rs:18:18
| |
LL | struct Wrap<T> { wrapped: T } LL | struct Wrap<T> { wrapped: T }
| ^^^^^^^^^^ | ^^^^^^^^^^
error: the type `!` does not permit zero-initialization error: the type `!` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:32:23 --> $DIR/uninitialized-zeroed.rs:40:23
| |
LL | let _val: ! = mem::zeroed(); LL | let _val: ! = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -67,7 +67,7 @@ LL | let _val: ! = mem::zeroed();
= note: The never type (`!`) has no valid value = note: The never type (`!`) has no valid value
error: the type `!` does not permit being left uninitialized error: the type `!` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:33:23 --> $DIR/uninitialized-zeroed.rs:41:23
| |
LL | let _val: ! = mem::uninitialized(); LL | let _val: ! = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -78,7 +78,7 @@ LL | let _val: ! = mem::uninitialized();
= note: The never type (`!`) has no valid value = note: The never type (`!`) has no valid value
error: the type `(i32, !)` does not permit zero-initialization error: the type `(i32, !)` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:35:30 --> $DIR/uninitialized-zeroed.rs:43:30
| |
LL | let _val: (i32, !) = mem::zeroed(); LL | let _val: (i32, !) = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -89,7 +89,7 @@ LL | let _val: (i32, !) = mem::zeroed();
= note: The never type (`!`) has no valid value = note: The never type (`!`) has no valid value
error: the type `(i32, !)` does not permit being left uninitialized error: the type `(i32, !)` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:36:30 --> $DIR/uninitialized-zeroed.rs:44:30
| |
LL | let _val: (i32, !) = mem::uninitialized(); LL | let _val: (i32, !) = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -100,7 +100,7 @@ LL | let _val: (i32, !) = mem::uninitialized();
= note: The never type (`!`) has no valid value = note: The never type (`!`) has no valid value
error: the type `Void` does not permit zero-initialization error: the type `Void` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:38:26 --> $DIR/uninitialized-zeroed.rs:46:26
| |
LL | let _val: Void = mem::zeroed(); LL | let _val: Void = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -111,7 +111,7 @@ LL | let _val: Void = mem::zeroed();
= note: 0-variant enums have no valid value = note: 0-variant enums have no valid value
error: the type `Void` does not permit being left uninitialized error: the type `Void` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:39:26 --> $DIR/uninitialized-zeroed.rs:47:26
| |
LL | let _val: Void = mem::uninitialized(); LL | let _val: Void = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -122,7 +122,7 @@ LL | let _val: Void = mem::uninitialized();
= note: 0-variant enums have no valid value = note: 0-variant enums have no valid value
error: the type `&'static i32` does not permit zero-initialization error: the type `&'static i32` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:41:34 --> $DIR/uninitialized-zeroed.rs:49:34
| |
LL | let _val: &'static i32 = mem::zeroed(); LL | let _val: &'static i32 = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -133,7 +133,7 @@ LL | let _val: &'static i32 = mem::zeroed();
= note: References must be non-null = note: References must be non-null
error: the type `&'static i32` does not permit being left uninitialized error: the type `&'static i32` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:42:34 --> $DIR/uninitialized-zeroed.rs:50:34
| |
LL | let _val: &'static i32 = mem::uninitialized(); LL | let _val: &'static i32 = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -144,7 +144,7 @@ LL | let _val: &'static i32 = mem::uninitialized();
= note: References must be non-null = note: References must be non-null
error: the type `Ref` does not permit zero-initialization error: the type `Ref` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:44:25 --> $DIR/uninitialized-zeroed.rs:52:25
| |
LL | let _val: Ref = mem::zeroed(); LL | let _val: Ref = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -153,13 +153,13 @@ LL | let _val: Ref = mem::zeroed();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: References must be non-null (in this struct field) note: References must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:13:12 --> $DIR/uninitialized-zeroed.rs:15:12
| |
LL | struct Ref(&'static i32); LL | struct Ref(&'static i32);
| ^^^^^^^^^^^^ | ^^^^^^^^^^^^
error: the type `Ref` does not permit being left uninitialized error: the type `Ref` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:45:25 --> $DIR/uninitialized-zeroed.rs:53:25
| |
LL | let _val: Ref = mem::uninitialized(); LL | let _val: Ref = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -168,13 +168,13 @@ LL | let _val: Ref = mem::uninitialized();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: References must be non-null (in this struct field) note: References must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:13:12 --> $DIR/uninitialized-zeroed.rs:15:12
| |
LL | struct Ref(&'static i32); LL | struct Ref(&'static i32);
| ^^^^^^^^^^^^ | ^^^^^^^^^^^^
error: the type `fn()` does not permit zero-initialization error: the type `fn()` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:47:26 --> $DIR/uninitialized-zeroed.rs:55:26
| |
LL | let _val: fn() = mem::zeroed(); LL | let _val: fn() = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -185,7 +185,7 @@ LL | let _val: fn() = mem::zeroed();
= note: Function pointers must be non-null = note: Function pointers must be non-null
error: the type `fn()` does not permit being left uninitialized error: the type `fn()` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:48:26 --> $DIR/uninitialized-zeroed.rs:56:26
| |
LL | let _val: fn() = mem::uninitialized(); LL | let _val: fn() = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -196,7 +196,7 @@ LL | let _val: fn() = mem::uninitialized();
= note: Function pointers must be non-null = note: Function pointers must be non-null
error: the type `Wrap<fn()>` does not permit zero-initialization error: the type `Wrap<fn()>` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:50:32 --> $DIR/uninitialized-zeroed.rs:58:32
| |
LL | let _val: Wrap<fn()> = mem::zeroed(); LL | let _val: Wrap<fn()> = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -205,13 +205,13 @@ LL | let _val: Wrap<fn()> = mem::zeroed();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: Function pointers must be non-null (in this struct field) note: Function pointers must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:16:18 --> $DIR/uninitialized-zeroed.rs:18:18
| |
LL | struct Wrap<T> { wrapped: T } LL | struct Wrap<T> { wrapped: T }
| ^^^^^^^^^^ | ^^^^^^^^^^
error: the type `Wrap<fn()>` does not permit being left uninitialized error: the type `Wrap<fn()>` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:51:32 --> $DIR/uninitialized-zeroed.rs:59:32
| |
LL | let _val: Wrap<fn()> = mem::uninitialized(); LL | let _val: Wrap<fn()> = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -220,13 +220,13 @@ LL | let _val: Wrap<fn()> = mem::uninitialized();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: Function pointers must be non-null (in this struct field) note: Function pointers must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:16:18 --> $DIR/uninitialized-zeroed.rs:18:18
| |
LL | struct Wrap<T> { wrapped: T } LL | struct Wrap<T> { wrapped: T }
| ^^^^^^^^^^ | ^^^^^^^^^^
error: the type `WrapEnum<fn()>` does not permit zero-initialization error: the type `WrapEnum<fn()>` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:53:36 --> $DIR/uninitialized-zeroed.rs:61:36
| |
LL | let _val: WrapEnum<fn()> = mem::zeroed(); LL | let _val: WrapEnum<fn()> = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -235,13 +235,13 @@ LL | let _val: WrapEnum<fn()> = mem::zeroed();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: Function pointers must be non-null (in this enum field) note: Function pointers must be non-null (in this enum field)
--> $DIR/uninitialized-zeroed.rs:17:28 --> $DIR/uninitialized-zeroed.rs:19:28
| |
LL | enum WrapEnum<T> { Wrapped(T) } LL | enum WrapEnum<T> { Wrapped(T) }
| ^ | ^
error: the type `WrapEnum<fn()>` does not permit being left uninitialized error: the type `WrapEnum<fn()>` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:54:36 --> $DIR/uninitialized-zeroed.rs:62:36
| |
LL | let _val: WrapEnum<fn()> = mem::uninitialized(); LL | let _val: WrapEnum<fn()> = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -250,13 +250,13 @@ LL | let _val: WrapEnum<fn()> = mem::uninitialized();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: Function pointers must be non-null (in this enum field) note: Function pointers must be non-null (in this enum field)
--> $DIR/uninitialized-zeroed.rs:17:28 --> $DIR/uninitialized-zeroed.rs:19:28
| |
LL | enum WrapEnum<T> { Wrapped(T) } LL | enum WrapEnum<T> { Wrapped(T) }
| ^ | ^
error: the type `Wrap<(RefPair, i32)>` does not permit zero-initialization error: the type `Wrap<(RefPair, i32)>` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:56:42 --> $DIR/uninitialized-zeroed.rs:64:42
| |
LL | let _val: Wrap<(RefPair, i32)> = mem::zeroed(); LL | let _val: Wrap<(RefPair, i32)> = mem::zeroed();
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
@ -265,13 +265,13 @@ LL | let _val: Wrap<(RefPair, i32)> = mem::zeroed();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: References must be non-null (in this struct field) note: References must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:14:16 --> $DIR/uninitialized-zeroed.rs:16:16
| |
LL | struct RefPair((&'static i32, i32)); LL | struct RefPair((&'static i32, i32));
| ^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^
error: the type `Wrap<(RefPair, i32)>` does not permit being left uninitialized error: the type `Wrap<(RefPair, i32)>` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:57:42 --> $DIR/uninitialized-zeroed.rs:65:42
| |
LL | let _val: Wrap<(RefPair, i32)> = mem::uninitialized(); LL | let _val: Wrap<(RefPair, i32)> = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
@ -280,10 +280,102 @@ LL | let _val: Wrap<(RefPair, i32)> = mem::uninitialized();
| help: use `MaybeUninit<T>` instead | help: use `MaybeUninit<T>` instead
| |
note: References must be non-null (in this struct field) note: References must be non-null (in this struct field)
--> $DIR/uninitialized-zeroed.rs:14:16 --> $DIR/uninitialized-zeroed.rs:16:16
| |
LL | struct RefPair((&'static i32, i32)); LL | struct RefPair((&'static i32, i32));
| ^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^
error: aborting due to 22 previous errors error: the type `std::ptr::NonNull<i32>` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:67:34
|
LL | let _val: NonNull<i32> = mem::zeroed();
| ^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
= note: std::ptr::NonNull<i32> must be non-null
error: the type `std::ptr::NonNull<i32>` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:68:34
|
LL | let _val: NonNull<i32> = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
= note: std::ptr::NonNull<i32> must be non-null
error: the type `bool` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:72:26
|
LL | let _val: bool = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
= note: Booleans must be `true` or `false`
error: the type `Wrap<char>` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:75:32
|
LL | let _val: Wrap<char> = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
note: Characters must be a valid unicode codepoint (in this struct field)
--> $DIR/uninitialized-zeroed.rs:18:18
|
LL | struct Wrap<T> { wrapped: T }
| ^^^^^^^^^^
error: the type `NonBig` does not permit being left uninitialized
--> $DIR/uninitialized-zeroed.rs:78:28
|
LL | let _val: NonBig = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
= note: NonBig must be initialized inside its custom valid range
error: the type `&'static i32` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:81:34
|
LL | let _val: &'static i32 = mem::transmute(0usize);
| ^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
= note: References must be non-null
error: the type `&'static [i32]` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:82:36
|
LL | let _val: &'static [i32] = mem::transmute((0usize, 0usize));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
= note: References must be non-null
error: the type `std::num::NonZeroU32` does not permit zero-initialization
--> $DIR/uninitialized-zeroed.rs:83:32
|
LL | let _val: NonZeroU32 = mem::transmute(0);
| ^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead
|
= note: std::num::NonZeroU32 must be non-null
error: aborting due to 30 previous errors

9
src/test/ui/methods/method-projection.rs
View file

@ -2,9 +2,6 @@
// Test that we can use method notation to call methods based on a // Test that we can use method notation to call methods based on a
// projection bound from a trait. Issue #20469. // projection bound from a trait. Issue #20469.
///////////////////////////////////////////////////////////////////////////
trait MakeString { trait MakeString {
fn make_string(&self) -> String; fn make_string(&self) -> String;
} }
@ -21,8 +18,6 @@ impl MakeString for usize {
} }
} }
///////////////////////////////////////////////////////////////////////////
trait Foo { trait Foo {
type F: MakeString; type F: MakeString;
@ -33,8 +28,6 @@ fn foo<F:Foo>(f: &F) -> String {
f.get().make_string() f.get().make_string()
} }
///////////////////////////////////////////////////////////////////////////
struct SomeStruct { struct SomeStruct {
field: isize, field: isize,
} }
@ -47,8 +40,6 @@ impl Foo for SomeStruct {
} }
} }
///////////////////////////////////////////////////////////////////////////
struct SomeOtherStruct { struct SomeOtherStruct {
field: usize, field: usize,
} }

12
src/test/ui/proc-macro/auxiliary/gen-macro-rules.rs Normal file
View file

@ -0,0 +1,12 @@
// force-host
// no-prefer-dynamic
#![crate_type = "proc-macro"]
extern crate proc_macro;
use proc_macro::TokenStream;
#[proc_macro_derive(repro)]
pub fn proc_macro_hack_expr(_input: TokenStream) -> TokenStream {
"macro_rules! m {()=>{}}".parse().unwrap()
}

13
src/test/ui/proc-macro/gen-macro-rules.rs Normal file
View file

@ -0,0 +1,13 @@
// Derive macros can generate `macro_rules` items, regression test for issue #63651.
// check-pass
// aux-build:gen-macro-rules.rs
extern crate gen_macro_rules as repro;
#[derive(repro::repro)]
pub struct S;
m!(); // OK
fn main() {}

4
src/test/ui/regions/regions-outlives-projection-container-hrtb.migrate.nll.stderr
View file

@ -1,5 +1,5 @@
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container-hrtb.rs:35:12 --> $DIR/regions-outlives-projection-container-hrtb.rs:30:12
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here
@ -10,7 +10,7 @@ LL | let _: &'a WithHrAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a` | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container-hrtb.rs:57:12 --> $DIR/regions-outlives-projection-container-hrtb.rs:50:12
| |
LL | fn with_assoc_sub<'a,'b>() { LL | fn with_assoc_sub<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here

20
src/test/ui/regions/regions-outlives-projection-container-hrtb.migrate.stderr
View file

@ -1,33 +1,33 @@
error[E0491]: in type `&'a WithHrAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references error[E0491]: in type `&'a WithHrAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references
--> $DIR/regions-outlives-projection-container-hrtb.rs:35:12 --> $DIR/regions-outlives-projection-container-hrtb.rs:30:12
| |
LL | let _: &'a WithHrAssoc<TheType<'b>> = loop { }; LL | let _: &'a WithHrAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
note: the pointer is valid for the lifetime 'a as defined on the function body at 32:15 note: the pointer is valid for the lifetime 'a as defined on the function body at 27:15
--> $DIR/regions-outlives-projection-container-hrtb.rs:32:15 --> $DIR/regions-outlives-projection-container-hrtb.rs:27:15
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| ^^ | ^^
note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 32:18 note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 27:18
--> $DIR/regions-outlives-projection-container-hrtb.rs:32:18 --> $DIR/regions-outlives-projection-container-hrtb.rs:27:18
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| ^^ | ^^
error[E0491]: in type `&'a WithHrAssocSub<TheType<'b>>`, reference has a longer lifetime than the data it references error[E0491]: in type `&'a WithHrAssocSub<TheType<'b>>`, reference has a longer lifetime than the data it references
--> $DIR/regions-outlives-projection-container-hrtb.rs:57:12 --> $DIR/regions-outlives-projection-container-hrtb.rs:50:12
| |
LL | let _: &'a WithHrAssocSub<TheType<'b>> = loop { }; LL | let _: &'a WithHrAssocSub<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
note: the pointer is valid for the lifetime 'a as defined on the function body at 53:19 note: the pointer is valid for the lifetime 'a as defined on the function body at 46:19
--> $DIR/regions-outlives-projection-container-hrtb.rs:53:19 --> $DIR/regions-outlives-projection-container-hrtb.rs:46:19
| |
LL | fn with_assoc_sub<'a,'b>() { LL | fn with_assoc_sub<'a,'b>() {
| ^^ | ^^
note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 53:22 note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 46:22
--> $DIR/regions-outlives-projection-container-hrtb.rs:53:22 --> $DIR/regions-outlives-projection-container-hrtb.rs:46:22
| |
LL | fn with_assoc_sub<'a,'b>() { LL | fn with_assoc_sub<'a,'b>() {
| ^^ | ^^

4
src/test/ui/regions/regions-outlives-projection-container-hrtb.nll.stderr
View file

@ -1,5 +1,5 @@
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container-hrtb.rs:35:12 --> $DIR/regions-outlives-projection-container-hrtb.rs:30:12
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here
@ -10,7 +10,7 @@ LL | let _: &'a WithHrAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a` | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container-hrtb.rs:57:12 --> $DIR/regions-outlives-projection-container-hrtb.rs:50:12
| |
LL | fn with_assoc_sub<'a,'b>() { LL | fn with_assoc_sub<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here

7
src/test/ui/regions/regions-outlives-projection-container-hrtb.rs
View file

@ -6,9 +6,6 @@
#![allow(dead_code)] #![allow(dead_code)]
///////////////////////////////////////////////////////////////////////////
pub trait TheTrait<'b> { pub trait TheTrait<'b> {
type TheAssocType; type TheAssocType;
} }
@ -21,8 +18,6 @@ impl<'a,'b> TheTrait<'a> for TheType<'b> {
type TheAssocType = &'b (); type TheAssocType = &'b ();
} }
///////////////////////////////////////////////////////////////////////////
pub struct WithHrAssoc<T> pub struct WithHrAssoc<T>
where for<'a> T : TheTrait<'a> where for<'a> T : TheTrait<'a>
{ {
@ -37,8 +32,6 @@ fn with_assoc<'a,'b>() {
//[nll]~^^ ERROR lifetime may not live long enough //[nll]~^^ ERROR lifetime may not live long enough
} }
///////////////////////////////////////////////////////////////////////////
pub trait TheSubTrait : for<'a> TheTrait<'a> { pub trait TheSubTrait : for<'a> TheTrait<'a> {
} }

2
src/test/ui/regions/regions-outlives-projection-container-wc.migrate.nll.stderr
View file

@ -1,5 +1,5 @@
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container-wc.rs:37:12 --> $DIR/regions-outlives-projection-container-wc.rs:33:12
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here

10
src/test/ui/regions/regions-outlives-projection-container-wc.migrate.stderr
View file

@ -1,16 +1,16 @@
error[E0491]: in type `&'a WithAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references error[E0491]: in type `&'a WithAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references
--> $DIR/regions-outlives-projection-container-wc.rs:37:12 --> $DIR/regions-outlives-projection-container-wc.rs:33:12
| |
LL | let _: &'a WithAssoc<TheType<'b>> = loop { }; LL | let _: &'a WithAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
note: the pointer is valid for the lifetime 'a as defined on the function body at 31:15 note: the pointer is valid for the lifetime 'a as defined on the function body at 27:15
--> $DIR/regions-outlives-projection-container-wc.rs:31:15 --> $DIR/regions-outlives-projection-container-wc.rs:27:15
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| ^^ | ^^
note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 31:18 note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 27:18
--> $DIR/regions-outlives-projection-container-wc.rs:31:18 --> $DIR/regions-outlives-projection-container-wc.rs:27:18
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| ^^ | ^^

2
src/test/ui/regions/regions-outlives-projection-container-wc.nll.stderr
View file

@ -1,5 +1,5 @@
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container-wc.rs:37:12 --> $DIR/regions-outlives-projection-container-wc.rs:33:12
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here

4
src/test/ui/regions/regions-outlives-projection-container-wc.rs
View file

@ -8,8 +8,6 @@
#![allow(dead_code)] #![allow(dead_code)]
///////////////////////////////////////////////////////////////////////////
pub trait TheTrait { pub trait TheTrait {
type TheAssocType; type TheAssocType;
} }
@ -22,8 +20,6 @@ impl<'b> TheTrait for TheType<'b> {
type TheAssocType = &'b (); type TheAssocType = &'b ();
} }
///////////////////////////////////////////////////////////////////////////
pub struct WithAssoc<T> where T : TheTrait { pub struct WithAssoc<T> where T : TheTrait {
m: [T; 0] m: [T; 0]
} }

8
src/test/ui/regions/regions-outlives-projection-container.nll.stderr
View file

@ -1,5 +1,5 @@
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container.rs:40:13 --> $DIR/regions-outlives-projection-container.rs:36:13
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here
@ -10,7 +10,7 @@ LL | let _x: &'a WithAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a` | ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container.rs:58:13 --> $DIR/regions-outlives-projection-container.rs:54:13
| |
LL | fn without_assoc<'a,'b>() { LL | fn without_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here
@ -21,7 +21,7 @@ LL | let _x: &'a WithoutAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a` | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container.rs:67:5 --> $DIR/regions-outlives-projection-container.rs:63:5
| |
LL | fn call_with_assoc<'a,'b>() { LL | fn call_with_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here
@ -32,7 +32,7 @@ LL | call::<&'a WithAssoc<TheType<'b>>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a` | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
error: lifetime may not live long enough error: lifetime may not live long enough
--> $DIR/regions-outlives-projection-container.rs:74:5 --> $DIR/regions-outlives-projection-container.rs:70:5
| |
LL | fn call_without_assoc<'a,'b>() { LL | fn call_without_assoc<'a,'b>() {
| -- -- lifetime `'b` defined here | -- -- lifetime `'b` defined here

4
src/test/ui/regions/regions-outlives-projection-container.rs
View file

@ -5,8 +5,6 @@
#![allow(dead_code)] #![allow(dead_code)]
#![feature(rustc_attrs)] #![feature(rustc_attrs)]
///////////////////////////////////////////////////////////////////////////
pub trait TheTrait { pub trait TheTrait {
type TheAssocType; type TheAssocType;
} }
@ -19,8 +17,6 @@ impl<'b> TheTrait for TheType<'b> {
type TheAssocType = &'b (); type TheAssocType = &'b ();
} }
///////////////////////////////////////////////////////////////////////////
pub struct WithAssoc<T:TheTrait> { pub struct WithAssoc<T:TheTrait> {
m: [T; 0] m: [T; 0]
} }

40
src/test/ui/regions/regions-outlives-projection-container.stderr
View file

@ -1,67 +1,67 @@
error[E0491]: in type `&'a WithAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references error[E0491]: in type `&'a WithAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references
--> $DIR/regions-outlives-projection-container.rs:40:13 --> $DIR/regions-outlives-projection-container.rs:36:13
| |
LL | let _x: &'a WithAssoc<TheType<'b>> = loop { }; LL | let _x: &'a WithAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
note: the pointer is valid for the lifetime 'a as defined on the function body at 32:15 note: the pointer is valid for the lifetime 'a as defined on the function body at 28:15
--> $DIR/regions-outlives-projection-container.rs:32:15 --> $DIR/regions-outlives-projection-container.rs:28:15
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| ^^ | ^^
note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 32:18 note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 28:18
--> $DIR/regions-outlives-projection-container.rs:32:18 --> $DIR/regions-outlives-projection-container.rs:28:18
| |
LL | fn with_assoc<'a,'b>() { LL | fn with_assoc<'a,'b>() {
| ^^ | ^^
error[E0491]: in type `&'a WithoutAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references error[E0491]: in type `&'a WithoutAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references
--> $DIR/regions-outlives-projection-container.rs:58:13 --> $DIR/regions-outlives-projection-container.rs:54:13
| |
LL | let _x: &'a WithoutAssoc<TheType<'b>> = loop { }; LL | let _x: &'a WithoutAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
note: the pointer is valid for the lifetime 'a as defined on the function body at 54:18 note: the pointer is valid for the lifetime 'a as defined on the function body at 50:18
--> $DIR/regions-outlives-projection-container.rs:54:18 --> $DIR/regions-outlives-projection-container.rs:50:18
| |
LL | fn without_assoc<'a,'b>() { LL | fn without_assoc<'a,'b>() {
| ^^ | ^^
note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 54:21 note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 50:21
--> $DIR/regions-outlives-projection-container.rs:54:21 --> $DIR/regions-outlives-projection-container.rs:50:21
| |
LL | fn without_assoc<'a,'b>() { LL | fn without_assoc<'a,'b>() {
| ^^ | ^^
error[E0491]: in type `&'a WithAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references error[E0491]: in type `&'a WithAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references
--> $DIR/regions-outlives-projection-container.rs:67:12 --> $DIR/regions-outlives-projection-container.rs:63:12
| |
LL | call::<&'a WithAssoc<TheType<'b>>>(); LL | call::<&'a WithAssoc<TheType<'b>>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
note: the pointer is valid for the lifetime 'a as defined on the function body at 62:20 note: the pointer is valid for the lifetime 'a as defined on the function body at 58:20
--> $DIR/regions-outlives-projection-container.rs:62:20 --> $DIR/regions-outlives-projection-container.rs:58:20
| |
LL | fn call_with_assoc<'a,'b>() { LL | fn call_with_assoc<'a,'b>() {
| ^^ | ^^
note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 62:23 note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 58:23
--> $DIR/regions-outlives-projection-container.rs:62:23 --> $DIR/regions-outlives-projection-container.rs:58:23
| |
LL | fn call_with_assoc<'a,'b>() { LL | fn call_with_assoc<'a,'b>() {
| ^^ | ^^
error[E0491]: in type `&'a WithoutAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references error[E0491]: in type `&'a WithoutAssoc<TheType<'b>>`, reference has a longer lifetime than the data it references
--> $DIR/regions-outlives-projection-container.rs:74:12 --> $DIR/regions-outlives-projection-container.rs:70:12
| |
LL | call::<&'a WithoutAssoc<TheType<'b>>>(); LL | call::<&'a WithoutAssoc<TheType<'b>>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
note: the pointer is valid for the lifetime 'a as defined on the function body at 71:23 note: the pointer is valid for the lifetime 'a as defined on the function body at 67:23
--> $DIR/regions-outlives-projection-container.rs:71:23 --> $DIR/regions-outlives-projection-container.rs:67:23
| |
LL | fn call_without_assoc<'a,'b>() { LL | fn call_without_assoc<'a,'b>() {
| ^^ | ^^
note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 71:26 note: but the referenced data is only valid for the lifetime 'b as defined on the function body at 67:26
--> $DIR/regions-outlives-projection-container.rs:71:26 --> $DIR/regions-outlives-projection-container.rs:67:26
| |
LL | fn call_without_assoc<'a,'b>() { LL | fn call_without_assoc<'a,'b>() {
| ^^ | ^^

8
src/test/ui/specialization/defaultimpl/specialization-no-default.rs
View file

@ -3,9 +3,7 @@
// Check a number of scenarios in which one impl tries to override another, // Check a number of scenarios in which one impl tries to override another,
// without correctly using `default`. // without correctly using `default`.
////////////////////////////////////////////////////////////////////////////////
// Test 1: one layer of specialization, multiple methods, missing `default` // Test 1: one layer of specialization, multiple methods, missing `default`
////////////////////////////////////////////////////////////////////////////////
trait Foo { trait Foo {
fn foo(&self); fn foo(&self);
@ -25,9 +23,7 @@ impl Foo for u32 {
fn bar(&self) {} //~ ERROR E0520 fn bar(&self) {} //~ ERROR E0520
} }
////////////////////////////////////////////////////////////////////////////////
// Test 2: one layer of specialization, missing `default` on associated type // Test 2: one layer of specialization, missing `default` on associated type
////////////////////////////////////////////////////////////////////////////////
trait Bar { trait Bar {
type T; type T;
@ -41,9 +37,7 @@ impl Bar for u8 {
type T = (); //~ ERROR E0520 type T = (); //~ ERROR E0520
} }
////////////////////////////////////////////////////////////////////////////////
// Test 3a: multiple layers of specialization, missing interior `default` // Test 3a: multiple layers of specialization, missing interior `default`
////////////////////////////////////////////////////////////////////////////////
trait Baz { trait Baz {
fn baz(&self); fn baz(&self);
@ -61,10 +55,8 @@ impl Baz for i32 {
fn baz(&self) {} //~ ERROR E0520 fn baz(&self) {} //~ ERROR E0520
} }
////////////////////////////////////////////////////////////////////////////////
// Test 3b: multiple layers of specialization, missing interior `default`, // Test 3b: multiple layers of specialization, missing interior `default`,
// redundant `default` in bottom layer. // redundant `default` in bottom layer.
////////////////////////////////////////////////////////////////////////////////
trait Redundant { trait Redundant {
fn redundant(&self); fn redundant(&self);

10
src/test/ui/specialization/defaultimpl/specialization-no-default.stderr
View file

@ -1,5 +1,5 @@
error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:22:5 --> $DIR/specialization-no-default.rs:20:5
| |
LL | / impl<T> Foo for T { LL | / impl<T> Foo for T {
LL | | fn foo(&self) {} LL | | fn foo(&self) {}
@ -13,7 +13,7 @@ LL | fn foo(&self) {}
= note: to specialize, `foo` in the parent `impl` must be marked `default` = note: to specialize, `foo` in the parent `impl` must be marked `default`
error[E0520]: `bar` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `bar` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:25:5 --> $DIR/specialization-no-default.rs:23:5
| |
LL | / impl<T> Foo for T { LL | / impl<T> Foo for T {
LL | | fn foo(&self) {} LL | | fn foo(&self) {}
@ -27,7 +27,7 @@ LL | fn bar(&self) {}
= note: to specialize, `bar` in the parent `impl` must be marked `default` = note: to specialize, `bar` in the parent `impl` must be marked `default`
error[E0520]: `T` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `T` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:41:5 --> $DIR/specialization-no-default.rs:37:5
| |
LL | / impl<T> Bar for T { LL | / impl<T> Bar for T {
LL | | type T = u8; LL | | type T = u8;
@ -40,7 +40,7 @@ LL | type T = ();
= note: to specialize, `T` in the parent `impl` must be marked `default` = note: to specialize, `T` in the parent `impl` must be marked `default`
error[E0520]: `baz` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `baz` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:61:5 --> $DIR/specialization-no-default.rs:55:5
| |
LL | / impl<T: Clone> Baz for T { LL | / impl<T: Clone> Baz for T {
LL | | fn baz(&self) {} LL | | fn baz(&self) {}
@ -53,7 +53,7 @@ LL | fn baz(&self) {}
= note: to specialize, `baz` in the parent `impl` must be marked `default` = note: to specialize, `baz` in the parent `impl` must be marked `default`
error[E0520]: `redundant` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `redundant` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:82:5 --> $DIR/specialization-no-default.rs:74:5
| |
LL | / impl<T: Clone> Redundant for T { LL | / impl<T: Clone> Redundant for T {
LL | | fn redundant(&self) {} LL | | fn redundant(&self) {}

8
src/test/ui/specialization/specialization-no-default.rs
View file

@ -3,9 +3,7 @@
// Check a number of scenarios in which one impl tries to override another, // Check a number of scenarios in which one impl tries to override another,
// without correctly using `default`. // without correctly using `default`.
////////////////////////////////////////////////////////////////////////////////
// Test 1: one layer of specialization, multiple methods, missing `default` // Test 1: one layer of specialization, multiple methods, missing `default`
////////////////////////////////////////////////////////////////////////////////
trait Foo { trait Foo {
fn foo(&self); fn foo(&self);
@ -25,9 +23,7 @@ impl Foo for u32 {
fn bar(&self) {} //~ ERROR E0520 fn bar(&self) {} //~ ERROR E0520
} }
////////////////////////////////////////////////////////////////////////////////
// Test 2: one layer of specialization, missing `default` on associated type // Test 2: one layer of specialization, missing `default` on associated type
////////////////////////////////////////////////////////////////////////////////
trait Bar { trait Bar {
type T; type T;
@ -41,9 +37,7 @@ impl Bar for u8 {
type T = (); //~ ERROR E0520 type T = (); //~ ERROR E0520
} }
////////////////////////////////////////////////////////////////////////////////
// Test 3a: multiple layers of specialization, missing interior `default` // Test 3a: multiple layers of specialization, missing interior `default`
////////////////////////////////////////////////////////////////////////////////
trait Baz { trait Baz {
fn baz(&self); fn baz(&self);
@ -61,10 +55,8 @@ impl Baz for i32 {
fn baz(&self) {} //~ ERROR E0520 fn baz(&self) {} //~ ERROR E0520
} }
////////////////////////////////////////////////////////////////////////////////
// Test 3b: multiple layers of specialization, missing interior `default`, // Test 3b: multiple layers of specialization, missing interior `default`,
// redundant `default` in bottom layer. // redundant `default` in bottom layer.
////////////////////////////////////////////////////////////////////////////////
trait Redundant { trait Redundant {
fn redundant(&self); fn redundant(&self);

10
src/test/ui/specialization/specialization-no-default.stderr
View file

@ -1,5 +1,5 @@
error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:22:5 --> $DIR/specialization-no-default.rs:20:5
| |
LL | / impl<T> Foo for T { LL | / impl<T> Foo for T {
LL | | fn foo(&self) {} LL | | fn foo(&self) {}
@ -13,7 +13,7 @@ LL | fn foo(&self) {}
= note: to specialize, `foo` in the parent `impl` must be marked `default` = note: to specialize, `foo` in the parent `impl` must be marked `default`
error[E0520]: `bar` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `bar` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:25:5 --> $DIR/specialization-no-default.rs:23:5
| |
LL | / impl<T> Foo for T { LL | / impl<T> Foo for T {
LL | | fn foo(&self) {} LL | | fn foo(&self) {}
@ -27,7 +27,7 @@ LL | fn bar(&self) {}
= note: to specialize, `bar` in the parent `impl` must be marked `default` = note: to specialize, `bar` in the parent `impl` must be marked `default`
error[E0520]: `T` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `T` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:41:5 --> $DIR/specialization-no-default.rs:37:5
| |
LL | / impl<T> Bar for T { LL | / impl<T> Bar for T {
LL | | type T = u8; LL | | type T = u8;
@ -40,7 +40,7 @@ LL | type T = ();
= note: to specialize, `T` in the parent `impl` must be marked `default` = note: to specialize, `T` in the parent `impl` must be marked `default`
error[E0520]: `baz` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `baz` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:61:5 --> $DIR/specialization-no-default.rs:55:5
| |
LL | / impl<T: Clone> Baz for T { LL | / impl<T: Clone> Baz for T {
LL | | fn baz(&self) {} LL | | fn baz(&self) {}
@ -53,7 +53,7 @@ LL | fn baz(&self) {}
= note: to specialize, `baz` in the parent `impl` must be marked `default` = note: to specialize, `baz` in the parent `impl` must be marked `default`
error[E0520]: `redundant` specializes an item from a parent `impl`, but that item is not marked `default` error[E0520]: `redundant` specializes an item from a parent `impl`, but that item is not marked `default`
--> $DIR/specialization-no-default.rs:82:5 --> $DIR/specialization-no-default.rs:74:5
| |
LL | / impl<T: Clone> Redundant for T { LL | / impl<T: Clone> Redundant for T {
LL | | fn redundant(&self) {} LL | | fn redundant(&self) {}

6
src/test/ui/traits/traits-conditional-model-fn.rs
View file

@ -14,8 +14,6 @@ use go_trait::{Go, GoMut, GoOnce, go, go_mut, go_once};
use std::rc::Rc; use std::rc::Rc;
use std::cell::Cell; use std::cell::Cell;
///////////////////////////////////////////////////////////////////////////
struct SomeGoableThing { struct SomeGoableThing {
counter: Rc<Cell<isize>> counter: Rc<Cell<isize>>
} }
@ -26,8 +24,6 @@ impl Go for SomeGoableThing {
} }
} }
///////////////////////////////////////////////////////////////////////////
struct SomeGoOnceableThing { struct SomeGoOnceableThing {
counter: Rc<Cell<isize>> counter: Rc<Cell<isize>>
} }
@ -38,8 +34,6 @@ impl GoOnce for SomeGoOnceableThing {
} }
} }
///////////////////////////////////////////////////////////////////////////
fn main() { fn main() {
let counter = Rc::new(Cell::new(0)); let counter = Rc::new(Cell::new(0));
let mut x = SomeGoableThing { counter: counter.clone() }; let mut x = SomeGoableThing { counter: counter.clone() };