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Pretty print Fn traits in rustc_on_unimplemented

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This commit is contained in:
Michael Goulet 2023-10-05 01:50:00 +00:00
parent b20f40dba9
commit c83f642f12
61 changed files with 169 additions and 154 deletions
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1
compiler/rustc_span/src/symbol.rs
View file

@ -316,6 +316,7 @@ symbols! {
ToOwned,
ToString,
TokenStream,
Trait,
Try,
TryCaptureGeneric,
TryCapturePrintable,

14
compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
View file

@ -53,6 +53,7 @@ static ALLOWED_FORMAT_SYMBOLS: &[Symbol] = &[
sym::float,
sym::_Self,
sym::crate_local,
sym::Trait,
];
impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
@ -183,6 +184,19 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
flags.push((sym::cause, Some("MainFunctionType".to_string())));
}
if let Some(kind) = self.tcx.fn_trait_kind_from_def_id(trait_ref.def_id)
&& let ty::Tuple(args) = trait_ref.args.type_at(1).kind()
{
let args = args
.iter()
.map(|ty| ty.to_string())
.collect::<Vec<_>>()
.join(", ");
flags.push((sym::Trait, Some(format!("{}({args})", kind.as_str()))));
} else {
flags.push((sym::Trait, Some(trait_ref.print_only_trait_path().to_string())));
}
// Add all types without trimmed paths or visible paths, ensuring they end up with
// their "canonical" def path.
ty::print::with_no_trimmed_paths!(ty::print::with_no_visible_paths!({

24
library/core/src/ops/function.rs
View file

@ -56,7 +56,7 @@ use crate::marker::Tuple;
#[lang = "fn"]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_paren_sugar]
#[rustc_on_unimplemented(
#[cfg_attr(not(bootstrap), rustc_on_unimplemented(
on(
Args = "()",
note = "wrap the `{Self}` in a closure with no arguments: `|| {{ /* code */ }}`"
@ -67,9 +67,9 @@ use crate::marker::Tuple;
// SAFETY: tidy is not smart enough to tell that the below unsafe block is a string
label = "call the function in a closure: `|| unsafe {{ /* code */ }}`"
),
message = "expected a `{Fn}<{Args}>` closure, found `{Self}`",
label = "expected an `Fn<{Args}>` closure, found `{Self}`"
)]
message = "expected a `{Trait}` closure, found `{Self}`",
label = "expected an `{Trait}` closure, found `{Self}`"
))]
#[fundamental] // so that regex can rely that `&str: !FnMut`
#[must_use = "closures are lazy and do nothing unless called"]
// FIXME(effects) #[const_trait]
@ -143,7 +143,7 @@ pub trait Fn<Args: Tuple>: FnMut<Args> {
#[lang = "fn_mut"]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_paren_sugar]
#[rustc_on_unimplemented(
#[cfg_attr(not(bootstrap), rustc_on_unimplemented(
on(
Args = "()",
note = "wrap the `{Self}` in a closure with no arguments: `|| {{ /* code */ }}`"
@ -154,9 +154,9 @@ pub trait Fn<Args: Tuple>: FnMut<Args> {
// SAFETY: tidy is not smart enough to tell that the below unsafe block is a string
label = "call the function in a closure: `|| unsafe {{ /* code */ }}`"
),
message = "expected a `{FnMut}<{Args}>` closure, found `{Self}`",
label = "expected an `FnMut<{Args}>` closure, found `{Self}`"
)]
message = "expected a `{Trait}` closure, found `{Self}`",
label = "expected an `{Trait}` closure, found `{Self}`"
))]
#[fundamental] // so that regex can rely that `&str: !FnMut`
#[must_use = "closures are lazy and do nothing unless called"]
// FIXME(effects) #[const_trait]
@ -222,7 +222,7 @@ pub trait FnMut<Args: Tuple>: FnOnce<Args> {
#[lang = "fn_once"]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_paren_sugar]
#[rustc_on_unimplemented(
#[cfg_attr(not(bootstrap), rustc_on_unimplemented(
on(
Args = "()",
note = "wrap the `{Self}` in a closure with no arguments: `|| {{ /* code */ }}`"
@ -233,9 +233,9 @@ pub trait FnMut<Args: Tuple>: FnOnce<Args> {
// SAFETY: tidy is not smart enough to tell that the below unsafe block is a string
label = "call the function in a closure: `|| unsafe {{ /* code */ }}`"
),
message = "expected a `{FnOnce}<{Args}>` closure, found `{Self}`",
label = "expected an `FnOnce<{Args}>` closure, found `{Self}`"
)]
message = "expected a `{Trait}` closure, found `{Self}`",
label = "expected an `{Trait}` closure, found `{Self}`"
))]
#[fundamental] // so that regex can rely that `&str: !FnMut`
#[must_use = "closures are lazy and do nothing unless called"]
// FIXME(effects) #[const_trait]

2
tests/ui/closures/closure-expected.rs
View file

@ -1,5 +1,5 @@
fn main() {
let x = Some(1);
let y = x.or_else(4);
//~^ ERROR expected a `FnOnce<()>` closure, found `{integer}`
//~^ ERROR expected a `FnOnce()` closure, found `{integer}`
}

4
tests/ui/closures/closure-expected.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `FnOnce<()>` closure, found `{integer}`
error[E0277]: expected a `FnOnce()` closure, found `{integer}`
--> $DIR/closure-expected.rs:3:23
|
LL | let y = x.or_else(4);
| ------- ^ expected an `FnOnce<()>` closure, found `{integer}`
| ------- ^ expected an `FnOnce()` closure, found `{integer}`
| |
| required by a bound introduced by this call
|

2
tests/ui/closures/coerce-unsafe-to-closure.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `FnOnce<(&str,)>` closure, found `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}`
error[E0277]: expected a `FnOnce(&str)` closure, found `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}`
--> $DIR/coerce-unsafe-to-closure.rs:2:44
|
LL | let x: Option<&[u8]> = Some("foo").map(std::mem::transmute);

2
tests/ui/expr/malformed_closure/block_instead_of_closure_in_arg.rs
View file

@ -1,6 +1,6 @@
fn main() {
let number = 2;
Some(true).filter({ //~ ERROR expected a `FnOnce<(&bool,)>` closure, found `bool`
Some(true).filter({ //~ ERROR expected a `FnOnce(&bool)` closure, found `bool`
if number % 2 == 0 {
number == 0
} else {

4
tests/ui/expr/malformed_closure/block_instead_of_closure_in_arg.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `FnOnce<(&bool,)>` closure, found `bool`
error[E0277]: expected a `FnOnce(&bool)` closure, found `bool`
--> $DIR/block_instead_of_closure_in_arg.rs:3:23
|
LL | Some(true).filter({
@ -12,7 +12,7 @@ LL | || number != 0
LL | || }
| ||_________- this tail expression is of type `bool`
LL | | });
| |______^ expected an `FnOnce<(&bool,)>` closure, found `bool`
| |______^ expected an `FnOnce(&bool)` closure, found `bool`
|
= help: the trait `for<'a> FnOnce<(&'a bool,)>` is not implemented for `bool`
note: required by a bound in `Option::<T>::filter`

2
tests/ui/expr/malformed_closure/ruby_style_closure_successful_parse.rs
View file

@ -1,6 +1,6 @@
const x: usize =42;
fn main() {
let p = Some(45).and_then({|x| //~ ERROR expected a `FnOnce<({integer},)>` closure, found `Option<usize>`
let p = Some(45).and_then({|x| //~ ERROR expected a `FnOnce({integer})` closure, found `Option<usize>`
1 + 1;
Some(x * 2)
});

4
tests/ui/expr/malformed_closure/ruby_style_closure_successful_parse.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `FnOnce<({integer},)>` closure, found `Option<usize>`
error[E0277]: expected a `FnOnce({integer})` closure, found `Option<usize>`
--> $DIR/ruby_style_closure_successful_parse.rs:3:31
|
LL | let p = Some(45).and_then({|x|
@ -9,7 +9,7 @@ LL | | 1 + 1;
LL | | Some(x * 2)
| | ----------- this tail expression is of type `Option<usize>`
LL | | });
| |_____^ expected an `FnOnce<({integer},)>` closure, found `Option<usize>`
| |_____^ expected an `FnOnce({integer})` closure, found `Option<usize>`
|
= help: the trait `FnOnce<({integer},)>` is not implemented for `Option<usize>`
note: required by a bound in `Option::<T>::and_then`

2
tests/ui/extern/extern-wrong-value-type.rs vendored
View file

@ -7,5 +7,5 @@ fn main() {
// extern functions are extern "C" fn
let _x: extern "C" fn() = f; // OK
is_fn(f);
//~^ ERROR expected a `Fn<()>` closure, found `extern "C" fn() {f}`
//~^ ERROR expected a `Fn()` closure, found `extern "C" fn() {f}`
}

4
tests/ui/extern/extern-wrong-value-type.stderr vendored
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<()>` closure, found `extern "C" fn() {f}`
error[E0277]: expected a `Fn()` closure, found `extern "C" fn() {f}`
--> $DIR/extern-wrong-value-type.rs:9:11
|
LL | is_fn(f);
| ----- ^ expected an `Fn<()>` closure, found `extern "C" fn() {f}`
| ----- ^ expected an `Fn()` closure, found `extern "C" fn() {f}`
| |
| required by a bound introduced by this call
|

2
tests/ui/fn/fn-trait-formatting.rs
View file

@ -17,5 +17,5 @@ fn main() {
//~| found struct `Box<dyn FnMut() -> isize>`
needs_fn(1);
//~^ ERROR expected a `Fn<(isize,)>` closure, found `{integer}`
//~^ ERROR expected a `Fn(isize)` closure, found `{integer}`
}

4
tests/ui/fn/fn-trait-formatting.stderr
View file

@ -39,11 +39,11 @@ LL | let _: () = Box::new(|| -> isize { unimplemented!() }) as Box<dyn FnMut
= note: expected unit type `()`
found struct `Box<dyn FnMut() -> isize>`
error[E0277]: expected a `Fn<(isize,)>` closure, found `{integer}`
error[E0277]: expected a `Fn(isize)` closure, found `{integer}`
--> $DIR/fn-trait-formatting.rs:19:14
|
LL | needs_fn(1);
| -------- ^ expected an `Fn<(isize,)>` closure, found `{integer}`
| -------- ^ expected an `Fn(isize)` closure, found `{integer}`
| |
| required by a bound introduced by this call
|

2
tests/ui/generic-associated-types/issue-68642-broken-llvm-ir.rs
View file

@ -10,7 +10,7 @@ trait Fun {
impl<T> Fun for T {
type F<'a> = Self;
//~^ ERROR expected a `Fn<()>` closure, found `T`
//~^ ERROR expected a `Fn()` closure, found `T`
}
fn main() {

4
tests/ui/generic-associated-types/issue-68642-broken-llvm-ir.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<()>` closure, found `T`
error[E0277]: expected a `Fn()` closure, found `T`
--> $DIR/issue-68642-broken-llvm-ir.rs:12:18
|
LL | type F<'a> = Self;
| ^^^^ expected an `Fn<()>` closure, found `T`
| ^^^^ expected an `Fn()` closure, found `T`
|
= note: wrap the `T` in a closure with no arguments: `|| { /* code */ }`
note: required by a bound in `Fun::F`

2
tests/ui/generic-associated-types/issue-68643-broken-mir.rs
View file

@ -10,7 +10,7 @@ trait Fun {
impl<T> Fun for T {
type F<'a> = Self;
//~^ ERROR expected a `Fn<()>` closure, found `T`
//~^ ERROR expected a `Fn()` closure, found `T`
}
pub fn main() {

4
tests/ui/generic-associated-types/issue-68643-broken-mir.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<()>` closure, found `T`
error[E0277]: expected a `Fn()` closure, found `T`
--> $DIR/issue-68643-broken-mir.rs:12:18
|
LL | type F<'a> = Self;
| ^^^^ expected an `Fn<()>` closure, found `T`
| ^^^^ expected an `Fn()` closure, found `T`
|
= note: wrap the `T` in a closure with no arguments: `|| { /* code */ }`
note: required by a bound in `Fun::F`

2
tests/ui/generic-associated-types/issue-68644-codegen-selection.rs
View file

@ -10,7 +10,7 @@ trait Fun {
impl<T> Fun for T {
type F<'a> = Self;
//~^ ERROR expected a `Fn<()>` closure, found `T`
//~^ ERROR expected a `Fn()` closure, found `T`
}
fn main() {

4
tests/ui/generic-associated-types/issue-68644-codegen-selection.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<()>` closure, found `T`
error[E0277]: expected a `Fn()` closure, found `T`
--> $DIR/issue-68644-codegen-selection.rs:12:18
|
LL | type F<'a> = Self;
| ^^^^ expected an `Fn<()>` closure, found `T`
| ^^^^ expected an `Fn()` closure, found `T`
|
= note: wrap the `T` in a closure with no arguments: `|| { /* code */ }`
note: required by a bound in `Fun::F`

2
tests/ui/generic-associated-types/issue-68645-codegen-fulfillment.rs
View file

@ -10,7 +10,7 @@ trait Fun {
impl<T> Fun for T {
type F<'a> = Self;
//~^ ERROR expected a `Fn<()>` closure, found `T`
//~^ ERROR expected a `Fn()` closure, found `T`
}
fn main() {

4
tests/ui/generic-associated-types/issue-68645-codegen-fulfillment.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<()>` closure, found `T`
error[E0277]: expected a `Fn()` closure, found `T`
--> $DIR/issue-68645-codegen-fulfillment.rs:12:18
|
LL | type F<'a> = Self;
| ^^^^ expected an `Fn<()>` closure, found `T`
| ^^^^ expected an `Fn()` closure, found `T`
|
= note: wrap the `T` in a closure with no arguments: `|| { /* code */ }`
note: required by a bound in `Fun::F`

4
tests/ui/higher-ranked/trait-bounds/fn-ptr.classic.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<(&'w (),)>` closure, found `fn(&'w ())`
error[E0277]: expected a `Fn(&'w ())` closure, found `fn(&'w ())`
--> $DIR/fn-ptr.rs:12:5
|
LL | ice();
| ^^^ expected an `Fn<(&'w (),)>` closure, found `fn(&'w ())`
| ^^^ expected an `Fn(&'w ())` closure, found `fn(&'w ())`
|
= help: the trait `for<'w> Fn<(&'w (),)>` is not implemented for `fn(&'w ())`
note: required by a bound in `ice`

2
tests/ui/higher-ranked/trait-bounds/fn-ptr.rs
View file

@ -10,5 +10,5 @@ where
fn main() {
ice();
//[classic]~^ ERROR expected a `Fn<(&'w (),)>` closure, found `fn(&'w ())`
//[classic]~^ ERROR expected a `Fn(&'w ())` closure, found `fn(&'w ())`
}

4
tests/ui/higher-ranked/trait-bounds/normalize-under-binder/issue-62529-3.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<(<_ as ATC<'a>>::Type,)>` closure, found `F`
error[E0277]: expected a `Fn(<_ as ATC<'a>>::Type)` closure, found `F`
--> $DIR/issue-62529-3.rs:25:14
|
LL | call(f, ());
| ---- ^ expected an `Fn<(<_ as ATC<'a>>::Type,)>` closure, found `F`
| ---- ^ expected an `Fn(<_ as ATC<'a>>::Type)` closure, found `F`
| |
| required by a bound introduced by this call
|

4
tests/ui/implied-bounds/issue-100690.rs
View file

@ -35,8 +35,8 @@ impl<'a, T: 'a> Handle<'a, T, UIView<'a, T>, Result<(), io::Error>> for TUIHandl
F: FnOnce(&mut UIView<'a, T>) -> Result<(), io::Error> + Send + 'static,
{
real_dispatch(f)
//~^ ERROR expected a `FnOnce<(&mut UIView<'_, T>,)>` closure, found `F`
//~| NOTE expected an `FnOnce<(&mut UIView<'_, T>,)>` closure, found `F`
//~^ ERROR expected a `FnOnce(&mut UIView<'_, T>)` closure, found `F`
//~| NOTE expected an `FnOnce(&mut UIView<'_, T>)` closure, found `F`
//~| NOTE expected a closure with arguments
//~| NOTE required by a bound introduced by this call
}

4
tests/ui/implied-bounds/issue-100690.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `FnOnce<(&mut UIView<'_, T>,)>` closure, found `F`
error[E0277]: expected a `FnOnce(&mut UIView<'_, T>)` closure, found `F`
--> $DIR/issue-100690.rs:37:23
|
LL | real_dispatch(f)
| ------------- ^ expected an `FnOnce<(&mut UIView<'_, T>,)>` closure, found `F`
| ------------- ^ expected an `FnOnce(&mut UIView<'_, T>)` closure, found `F`
| |
| required by a bound introduced by this call
|

4
tests/ui/intrinsics/const-eval-select-bad.rs
View file

@ -8,8 +8,8 @@ const fn not_fn_items() {
//~^ ERROR this argument must be a function item
//~| ERROR this argument must be a function item
const_eval_select((), 42, 0xDEADBEEF);
//~^ ERROR expected a `FnOnce<()>` closure
//~| ERROR expected a `FnOnce<()>` closure
//~^ ERROR expected a `FnOnce()` closure
//~| ERROR expected a `FnOnce()` closure
//~| ERROR this argument must be a function item
//~| ERROR this argument must be a function item
}

8
tests/ui/intrinsics/const-eval-select-bad.stderr
View file

@ -25,11 +25,11 @@ LL | const_eval_select((), 42, 0xDEADBEEF);
= note: expected a function item, found {integer}
= help: consult the documentation on `const_eval_select` for more information
error[E0277]: expected a `FnOnce<()>` closure, found `{integer}`
error[E0277]: expected a `FnOnce()` closure, found `{integer}`
--> $DIR/const-eval-select-bad.rs:10:27
|
LL | const_eval_select((), 42, 0xDEADBEEF);
| ----------------- ^^ expected an `FnOnce<()>` closure, found `{integer}`
| ----------------- ^^ expected an `FnOnce()` closure, found `{integer}`
| |
| required by a bound introduced by this call
|
@ -47,11 +47,11 @@ LL | const_eval_select((), 42, 0xDEADBEEF);
= note: expected a function item, found {integer}
= help: consult the documentation on `const_eval_select` for more information
error[E0277]: expected a `FnOnce<()>` closure, found `{integer}`
error[E0277]: expected a `FnOnce()` closure, found `{integer}`
--> $DIR/const-eval-select-bad.rs:10:31
|
LL | const_eval_select((), 42, 0xDEADBEEF);
| ----------------- ^^^^^^^^^^ expected an `FnOnce<()>` closure, found `{integer}`
| ----------------- ^^^^^^^^^^ expected an `FnOnce()` closure, found `{integer}`
| |
| required by a bound introduced by this call
|

2
tests/ui/issues/issue-22034.rs
View file

@ -6,6 +6,6 @@ fn main() {
let ptr: *mut () = core::ptr::null_mut();
let _: &mut dyn Fn() = unsafe {
&mut *(ptr as *mut dyn Fn())
//~^ ERROR expected a `Fn<()>` closure, found `()`
//~^ ERROR expected a `Fn()` closure, found `()`
};
}

4
tests/ui/issues/issue-22034.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<()>` closure, found `()`
error[E0277]: expected a `Fn()` closure, found `()`
--> $DIR/issue-22034.rs:8:16
|
LL | &mut *(ptr as *mut dyn Fn())
| ^^^ expected an `Fn<()>` closure, found `()`
| ^^^ expected an `Fn()` closure, found `()`
|
= help: the trait `Fn<()>` is not implemented for `()`
= note: wrap the `()` in a closure with no arguments: `|| { /* code */ }`

4
tests/ui/issues/issue-23966.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `FnMut<(_, char)>` closure, found `()`
error[E0277]: expected a `FnMut(_, char)` closure, found `()`
--> $DIR/issue-23966.rs:2:32
|
LL | "".chars().fold(|_, _| (), ());
| ---- ^^ expected an `FnMut<(_, char)>` closure, found `()`
| ---- ^^ expected an `FnMut(_, char)` closure, found `()`
| |
| required by a bound introduced by this call
|

2
tests/ui/issues/issue-59494.rs
View file

@ -19,5 +19,5 @@ fn main() {
let g = |(a, _)| a;
let t7 = |env| |a| |b| t7p(f, g)(((env, a), b));
let t8 = t8n(t7, t7p(f, g));
//~^ ERROR: expected a `Fn<(_,)>` closure, found `impl Fn(((_, _), _))` [E0277]
//~^ ERROR: expected a `Fn(_)` closure, found `impl Fn(((_, _), _))` [E0277]
}

4
tests/ui/issues/issue-59494.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<(_,)>` closure, found `impl Fn(((_, _), _))`
error[E0277]: expected a `Fn(_)` closure, found `impl Fn(((_, _), _))`
--> $DIR/issue-59494.rs:21:22
|
LL | let t8 = t8n(t7, t7p(f, g));
| --- ^^^^^^^^^ expected an `Fn<(_,)>` closure, found `impl Fn(((_, _), _))`
| --- ^^^^^^^^^ expected an `Fn(_)` closure, found `impl Fn(((_, _), _))`
| |
| required by a bound introduced by this call
|

8
tests/ui/lifetimes/issue-76168-hr-outlives-3.rs
View file

@ -4,14 +4,14 @@
use std::future::Future;
async fn wrapper<F>(f: F)
//~^ ERROR: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
//~| ERROR: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
//~| ERROR: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
//~^ ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
//~| ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
//~| ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
where
F:,
for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a,
{
//~^ ERROR: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
//~^ ERROR: expected a `FnOnce(&'a mut i32)` closure, found `i32`
let mut i = 41;
&mut i;
}

16
tests/ui/lifetimes/issue-76168-hr-outlives-3.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
--> $DIR/issue-76168-hr-outlives-3.rs:6:1
|
LL | / async fn wrapper<F>(f: F)
@ -8,19 +8,19 @@ LL | |
LL | | where
LL | | F:,
LL | | for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a,
| |______________________________________________________________________________^ expected an `FnOnce<(&'a mut i32,)>` closure, found `i32`
| |______________________________________________________________________________^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
|
= help: the trait `for<'a> FnOnce<(&'a mut i32,)>` is not implemented for `i32`
error[E0277]: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
--> $DIR/issue-76168-hr-outlives-3.rs:6:10
|
LL | async fn wrapper<F>(f: F)
| ^^^^^^^ expected an `FnOnce<(&'a mut i32,)>` closure, found `i32`
| ^^^^^^^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
|
= help: the trait `for<'a> FnOnce<(&'a mut i32,)>` is not implemented for `i32`
error[E0277]: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
--> $DIR/issue-76168-hr-outlives-3.rs:13:1
|
LL | / {
@ -28,11 +28,11 @@ LL | |
LL | | let mut i = 41;
LL | | &mut i;
LL | | }
| |_^ expected an `FnOnce<(&'a mut i32,)>` closure, found `i32`
| |_^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
|
= help: the trait `for<'a> FnOnce<(&'a mut i32,)>` is not implemented for `i32`
error[E0277]: expected a `FnOnce<(&'a mut i32,)>` closure, found `i32`
error[E0277]: expected a `FnOnce(&'a mut i32)` closure, found `i32`
--> $DIR/issue-76168-hr-outlives-3.rs:6:1
|
LL | / async fn wrapper<F>(f: F)
@ -42,7 +42,7 @@ LL | |
LL | | where
LL | | F:,
LL | | for<'a> <i32 as FnOnce<(&'a mut i32,)>>::Output: Future<Output = ()> + 'a,
| |______________________________________________________________________________^ expected an `FnOnce<(&'a mut i32,)>` closure, found `i32`
| |______________________________________________________________________________^ expected an `FnOnce(&'a mut i32)` closure, found `i32`
|
= help: the trait `for<'a> FnOnce<(&'a mut i32,)>` is not implemented for `i32`

4
tests/ui/mismatched_types/suggest-option-asderef-unfixable.rs
View file

@ -24,9 +24,9 @@ fn main() {
let _ = produces_string().and_then(takes_str_but_too_many_refs);
//~^ ERROR type mismatch in function arguments
let _ = produces_string().and_then(takes_str_but_wrong_abi);
//~^ ERROR expected a `FnOnce<(String,)>` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
//~^ ERROR expected a `FnOnce(String)` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
let _ = produces_string().and_then(takes_str_but_unsafe);
//~^ ERROR expected a `FnOnce<(String,)>` closure, found `for<'a> unsafe fn(&'a str) -> Option<()> {takes_str_but_unsafe}`
//~^ ERROR expected a `FnOnce(String)` closure, found `for<'a> unsafe fn(&'a str) -> Option<()> {takes_str_but_unsafe}`
let _ = produces_string().and_then(no_args);
//~^ ERROR function is expected to take 1 argument, but it takes 0 arguments
let _ = Some(TypeWithoutDeref).and_then(takes_str_but_too_many_refs);

6
tests/ui/mismatched_types/suggest-option-asderef-unfixable.stderr
View file

@ -14,11 +14,11 @@ LL | let _ = produces_string().and_then(takes_str_but_too_many_refs);
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
error[E0277]: expected a `FnOnce<(String,)>` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
error[E0277]: expected a `FnOnce(String)` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
--> $DIR/suggest-option-asderef-unfixable.rs:26:40
|
LL | let _ = produces_string().and_then(takes_str_but_wrong_abi);
| -------- ^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce<(String,)>` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
| -------- ^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(String)` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
| |
| required by a bound introduced by this call
|
@ -26,7 +26,7 @@ LL | let _ = produces_string().and_then(takes_str_but_wrong_abi);
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
error[E0277]: expected a `FnOnce<(String,)>` closure, found `for<'a> unsafe fn(&'a str) -> Option<()> {takes_str_but_unsafe}`
error[E0277]: expected a `FnOnce(String)` closure, found `for<'a> unsafe fn(&'a str) -> Option<()> {takes_str_but_unsafe}`
--> $DIR/suggest-option-asderef-unfixable.rs:28:40
|
LL | let _ = produces_string().and_then(takes_str_but_unsafe);

12
tests/ui/rfcs/rfc-2396-target_feature-11/fn-traits.rs
View file

@ -21,14 +21,14 @@ fn call_once(f: impl FnOnce()) {
}
fn main() {
call(foo); //~ ERROR expected a `Fn<()>` closure, found `fn() {foo}`
call_mut(foo); //~ ERROR expected a `FnMut<()>` closure, found `fn() {foo}`
call_once(foo); //~ ERROR expected a `FnOnce<()>` closure, found `fn() {foo}`
call(foo); //~ ERROR expected a `Fn()` closure, found `fn() {foo}`
call_mut(foo); //~ ERROR expected a `FnMut()` closure, found `fn() {foo}`
call_once(foo); //~ ERROR expected a `FnOnce()` closure, found `fn() {foo}`
call(foo_unsafe);
//~^ ERROR expected a `Fn<()>` closure, found `unsafe fn() {foo_unsafe}`
//~^ ERROR expected a `Fn()` closure, found `unsafe fn() {foo_unsafe}`
call_mut(foo_unsafe);
//~^ ERROR expected a `FnMut<()>` closure, found `unsafe fn() {foo_unsafe}`
//~^ ERROR expected a `FnMut()` closure, found `unsafe fn() {foo_unsafe}`
call_once(foo_unsafe);
//~^ ERROR expected a `FnOnce<()>` closure, found `unsafe fn() {foo_unsafe}`
//~^ ERROR expected a `FnOnce()` closure, found `unsafe fn() {foo_unsafe}`
}

18
tests/ui/rfcs/rfc-2396-target_feature-11/fn-traits.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<()>` closure, found `fn() {foo}`
error[E0277]: expected a `Fn()` closure, found `fn() {foo}`
--> $DIR/fn-traits.rs:24:10
|
LL | call(foo);
| ---- ^^^ expected an `Fn<()>` closure, found `fn() {foo}`
| ---- ^^^ expected an `Fn()` closure, found `fn() {foo}`
| |
| required by a bound introduced by this call
|
@ -15,11 +15,11 @@ note: required by a bound in `call`
LL | fn call(f: impl Fn()) {
| ^^^^ required by this bound in `call`
error[E0277]: expected a `FnMut<()>` closure, found `fn() {foo}`
error[E0277]: expected a `FnMut()` closure, found `fn() {foo}`
--> $DIR/fn-traits.rs:25:14
|
LL | call_mut(foo);
| -------- ^^^ expected an `FnMut<()>` closure, found `fn() {foo}`
| -------- ^^^ expected an `FnMut()` closure, found `fn() {foo}`
| |
| required by a bound introduced by this call
|
@ -32,11 +32,11 @@ note: required by a bound in `call_mut`
LL | fn call_mut(f: impl FnMut()) {
| ^^^^^^^ required by this bound in `call_mut`
error[E0277]: expected a `FnOnce<()>` closure, found `fn() {foo}`
error[E0277]: expected a `FnOnce()` closure, found `fn() {foo}`
--> $DIR/fn-traits.rs:26:15
|
LL | call_once(foo);
| --------- ^^^ expected an `FnOnce<()>` closure, found `fn() {foo}`
| --------- ^^^ expected an `FnOnce()` closure, found `fn() {foo}`
| |
| required by a bound introduced by this call
|
@ -49,7 +49,7 @@ note: required by a bound in `call_once`
LL | fn call_once(f: impl FnOnce()) {
| ^^^^^^^^ required by this bound in `call_once`
error[E0277]: expected a `Fn<()>` closure, found `unsafe fn() {foo_unsafe}`
error[E0277]: expected a `Fn()` closure, found `unsafe fn() {foo_unsafe}`
--> $DIR/fn-traits.rs:28:10
|
LL | call(foo_unsafe);
@ -67,7 +67,7 @@ note: required by a bound in `call`
LL | fn call(f: impl Fn()) {
| ^^^^ required by this bound in `call`
error[E0277]: expected a `FnMut<()>` closure, found `unsafe fn() {foo_unsafe}`
error[E0277]: expected a `FnMut()` closure, found `unsafe fn() {foo_unsafe}`
--> $DIR/fn-traits.rs:30:14
|
LL | call_mut(foo_unsafe);
@ -85,7 +85,7 @@ note: required by a bound in `call_mut`
LL | fn call_mut(f: impl FnMut()) {
| ^^^^^^^ required by this bound in `call_mut`
error[E0277]: expected a `FnOnce<()>` closure, found `unsafe fn() {foo_unsafe}`
error[E0277]: expected a `FnOnce()` closure, found `unsafe fn() {foo_unsafe}`
--> $DIR/fn-traits.rs:32:15
|
LL | call_once(foo_unsafe);

4
tests/ui/suggestions/issue-104961.fixed
View file

@ -2,12 +2,12 @@
fn foo(x: &str) -> bool {
x.starts_with(&("hi".to_string() + " you"))
//~^ ERROR expected a `FnMut<(char,)>` closure, found `String`
//~^ ERROR expected a `FnMut(char)` closure, found `String`
}
fn foo2(x: &str) -> bool {
x.starts_with(&"hi".to_string())
//~^ ERROR expected a `FnMut<(char,)>` closure, found `String`
//~^ ERROR expected a `FnMut(char)` closure, found `String`
}
fn main() {

4
tests/ui/suggestions/issue-104961.rs
View file

@ -2,12 +2,12 @@
fn foo(x: &str) -> bool {
x.starts_with("hi".to_string() + " you")
//~^ ERROR expected a `FnMut<(char,)>` closure, found `String`
//~^ ERROR expected a `FnMut(char)` closure, found `String`
}
fn foo2(x: &str) -> bool {
x.starts_with("hi".to_string())
//~^ ERROR expected a `FnMut<(char,)>` closure, found `String`
//~^ ERROR expected a `FnMut(char)` closure, found `String`
}
fn main() {

4
tests/ui/suggestions/issue-104961.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `FnMut<(char,)>` closure, found `String`
error[E0277]: expected a `FnMut(char)` closure, found `String`
--> $DIR/issue-104961.rs:4:19
|
LL | x.starts_with("hi".to_string() + " you")
@ -15,7 +15,7 @@ help: consider borrowing here
LL | x.starts_with(&("hi".to_string() + " you"))
| ++ +
error[E0277]: expected a `FnMut<(char,)>` closure, found `String`
error[E0277]: expected a `FnMut(char)` closure, found `String`
--> $DIR/issue-104961.rs:9:19
|
LL | x.starts_with("hi".to_string())

2
tests/ui/suggestions/issue-62843.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `FnMut<(char,)>` closure, found `String`
error[E0277]: expected a `FnMut(char)` closure, found `String`
--> $DIR/issue-62843.rs:4:32
|
LL | println!("{:?}", line.find(pattern));

20
tests/ui/trait-bounds/mismatch-fn-trait.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `FnMut<(i32,)>` closure, found `impl FnMut(u32)`
error[E0277]: expected a `FnMut(i32)` closure, found `impl FnMut(u32)`
--> $DIR/mismatch-fn-trait.rs:4:10
|
LL | take(f)
| ---- ^ expected an `FnMut<(i32,)>` closure, found `impl FnMut(u32)`
| ---- ^ expected an `FnMut(i32)` closure, found `impl FnMut(u32)`
| |
| required by a bound introduced by this call
|
@ -14,11 +14,11 @@ note: required by a bound in `take`
LL | fn take(_f: impl FnMut(i32)) {}
| ^^^^^^^^^^ required by this bound in `take`
error[E0277]: expected a `FnMut<(i32,)>` closure, found `impl FnMut(i32, i32)`
error[E0277]: expected a `FnMut(i32)` closure, found `impl FnMut(i32, i32)`
--> $DIR/mismatch-fn-trait.rs:9:10
|
LL | take(f)
| ---- ^ expected an `FnMut<(i32,)>` closure, found `impl FnMut(i32, i32)`
| ---- ^ expected an `FnMut(i32)` closure, found `impl FnMut(i32, i32)`
| |
| required by a bound introduced by this call
|
@ -29,11 +29,11 @@ note: required by a bound in `take`
LL | fn take(_f: impl FnMut(i32)) {}
| ^^^^^^^^^^ required by this bound in `take`
error[E0277]: expected a `FnMut<(i32,)>` closure, found `impl FnMut()`
error[E0277]: expected a `FnMut(i32)` closure, found `impl FnMut()`
--> $DIR/mismatch-fn-trait.rs:14:10
|
LL | take(f)
| ---- ^ expected an `FnMut<(i32,)>` closure, found `impl FnMut()`
| ---- ^ expected an `FnMut(i32)` closure, found `impl FnMut()`
| |
| required by a bound introduced by this call
|
@ -44,11 +44,11 @@ note: required by a bound in `take`
LL | fn take(_f: impl FnMut(i32)) {}
| ^^^^^^^^^^ required by this bound in `take`
error[E0277]: expected a `FnMut<(i32,)>` closure, found `impl FnOnce(i32)`
error[E0277]: expected a `FnMut(i32)` closure, found `impl FnOnce(i32)`
--> $DIR/mismatch-fn-trait.rs:19:10
|
LL | take(f)
| ---- ^ expected an `FnMut<(i32,)>` closure, found `impl FnOnce(i32)`
| ---- ^ expected an `FnMut(i32)` closure, found `impl FnOnce(i32)`
| |
| required by a bound introduced by this call
|
@ -59,11 +59,11 @@ note: required by a bound in `take`
LL | fn take(_f: impl FnMut(i32)) {}
| ^^^^^^^^^^ required by this bound in `take`
error[E0277]: expected a `FnMut<(i32,)>` closure, found `impl FnOnce(u32)`
error[E0277]: expected a `FnMut(i32)` closure, found `impl FnOnce(u32)`
--> $DIR/mismatch-fn-trait.rs:24:10
|
LL | take(f)
| ---- ^ expected an `FnMut<(i32,)>` closure, found `impl FnOnce(u32)`
| ---- ^ expected an `FnMut(i32)` closure, found `impl FnOnce(u32)`
| |
| required by a bound introduced by this call
|

2
tests/ui/traits/associated_type_bound/check-trait-object-bounds-2.rs
View file

@ -11,5 +11,5 @@ fn f<T: for<'r> X<'r> + ?Sized>() {
fn main() {
f::<dyn for<'x> X<'x, F = i32>>();
//~^ expected a `FnOnce<(&i32,)>` closure, found `i32`
//~^ expected a `FnOnce(&i32)` closure, found `i32`
}

4
tests/ui/traits/associated_type_bound/check-trait-object-bounds-2.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `FnOnce<(&i32,)>` closure, found `i32`
error[E0277]: expected a `FnOnce(&i32)` closure, found `i32`
--> $DIR/check-trait-object-bounds-2.rs:13:9
|
LL | f::<dyn for<'x> X<'x, F = i32>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce<(&i32,)>` closure, found `i32`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(&i32)` closure, found `i32`
|
= help: the trait `for<'a> FnOnce<(&'a i32,)>` is not implemented for `i32`
note: required by a bound in `f`

4
tests/ui/traits/bound/assoc-fn-bound-root-obligation.rs
View file

@ -1,7 +1,7 @@
fn strip_lf(s: &str) -> &str {
s.strip_suffix(b'\n').unwrap_or(s)
//~^ ERROR expected a `FnMut<(char,)>` closure, found `u8`
//~| NOTE expected an `FnMut<(char,)>` closure, found `u8`
//~^ ERROR expected a `FnMut(char)` closure, found `u8`
//~| NOTE expected an `FnMut(char)` closure, found `u8`
//~| HELP the trait `FnMut<(char,)>` is not implemented for `u8`
//~| HELP the following other types implement trait `Pattern<'a>`:
//~| NOTE required for `u8` to implement `Pattern<'_>`

4
tests/ui/traits/bound/assoc-fn-bound-root-obligation.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `FnMut<(char,)>` closure, found `u8`
error[E0277]: expected a `FnMut(char)` closure, found `u8`
--> $DIR/assoc-fn-bound-root-obligation.rs:2:7
|
LL | s.strip_suffix(b'\n').unwrap_or(s)
| ^^^^^^^^^^^^ expected an `FnMut<(char,)>` closure, found `u8`
| ^^^^^^^^^^^^ expected an `FnMut(char)` closure, found `u8`
|
= help: the trait `FnMut<(char,)>` is not implemented for `u8`
= help: the following other types implement trait `Pattern<'a>`:

8
tests/ui/traits/new-solver/fn-trait.rs
View file

@ -18,15 +18,15 @@ fn main() {
require_fn(f);
require_fn(f as fn() -> i32);
require_fn(f as unsafe fn() -> i32);
//~^ ERROR: expected a `Fn<()>` closure, found `unsafe fn() -> i32`
//~^ ERROR: expected a `Fn()` closure, found `unsafe fn() -> i32`
//~| ERROR: type mismatch resolving `<unsafe fn() -> i32 as FnOnce<()>>::Output == i32`
require_fn(g);
//~^ ERROR: expected a `Fn<()>` closure, found `extern "C" fn() -> i32 {g}`
//~^ ERROR: expected a `Fn()` closure, found `extern "C" fn() -> i32 {g}`
//~| ERROR: type mismatch resolving `<extern "C" fn() -> i32 {g} as FnOnce<()>>::Output == i32`
require_fn(g as extern "C" fn() -> i32);
//~^ ERROR: expected a `Fn<()>` closure, found `extern "C" fn() -> i32`
//~^ ERROR: expected a `Fn()` closure, found `extern "C" fn() -> i32`
//~| ERROR: type mismatch resolving `<extern "C" fn() -> i32 as FnOnce<()>>::Output == i32`
require_fn(h);
//~^ ERROR: expected a `Fn<()>` closure, found `unsafe fn() -> i32 {h}`
//~^ ERROR: expected a `Fn()` closure, found `unsafe fn() -> i32 {h}`
//~| ERROR: type mismatch resolving `<unsafe fn() -> i32 {h} as FnOnce<()>>::Output == i32`
}

12
tests/ui/traits/new-solver/fn-trait.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `Fn<()>` closure, found `unsafe fn() -> i32`
error[E0277]: expected a `Fn()` closure, found `unsafe fn() -> i32`
--> $DIR/fn-trait.rs:20:16
|
LL | require_fn(f as unsafe fn() -> i32);
@ -29,11 +29,11 @@ note: required by a bound in `require_fn`
LL | fn require_fn(_: impl Fn() -> i32) {}
| ^^^ required by this bound in `require_fn`
error[E0277]: expected a `Fn<()>` closure, found `extern "C" fn() -> i32 {g}`
error[E0277]: expected a `Fn()` closure, found `extern "C" fn() -> i32 {g}`
--> $DIR/fn-trait.rs:23:16
|
LL | require_fn(g);
| ---------- ^ expected an `Fn<()>` closure, found `extern "C" fn() -> i32 {g}`
| ---------- ^ expected an `Fn()` closure, found `extern "C" fn() -> i32 {g}`
| |
| required by a bound introduced by this call
|
@ -59,11 +59,11 @@ note: required by a bound in `require_fn`
LL | fn require_fn(_: impl Fn() -> i32) {}
| ^^^ required by this bound in `require_fn`
error[E0277]: expected a `Fn<()>` closure, found `extern "C" fn() -> i32`
error[E0277]: expected a `Fn()` closure, found `extern "C" fn() -> i32`
--> $DIR/fn-trait.rs:26:16
|
LL | require_fn(g as extern "C" fn() -> i32);
| ---------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `Fn<()>` closure, found `extern "C" fn() -> i32`
| ---------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `Fn()` closure, found `extern "C" fn() -> i32`
| |
| required by a bound introduced by this call
|
@ -89,7 +89,7 @@ note: required by a bound in `require_fn`
LL | fn require_fn(_: impl Fn() -> i32) {}
| ^^^ required by this bound in `require_fn`
error[E0277]: expected a `Fn<()>` closure, found `unsafe fn() -> i32 {h}`
error[E0277]: expected a `Fn()` closure, found `unsafe fn() -> i32 {h}`
--> $DIR/fn-trait.rs:29:16
|
LL | require_fn(h);

2
tests/ui/traits/suggest-dereferences/root-obligation.fixed
View file

@ -4,7 +4,7 @@ fn get_vowel_count(string: &str) -> usize {
string
.chars()
.filter(|c| "aeiou".contains(*c))
//~^ ERROR expected a `Fn<(char,)>` closure, found `char`
//~^ ERROR expected a `Fn(char)` closure, found `char`
.count()
}

2
tests/ui/traits/suggest-dereferences/root-obligation.rs
View file

@ -4,7 +4,7 @@ fn get_vowel_count(string: &str) -> usize {
string
.chars()
.filter(|c| "aeiou".contains(c))
//~^ ERROR expected a `Fn<(char,)>` closure, found `char`
//~^ ERROR expected a `Fn(char)` closure, found `char`
.count()
}

4
tests/ui/traits/suggest-dereferences/root-obligation.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<(char,)>` closure, found `char`
error[E0277]: expected a `Fn(char)` closure, found `char`
--> $DIR/root-obligation.rs:6:38
|
LL | .filter(|c| "aeiou".contains(c))
| -------- ^ expected an `Fn<(char,)>` closure, found `char`
| -------- ^ expected an `Fn(char)` closure, found `char`
| |
| required by a bound introduced by this call
|

4
tests/ui/type-alias-impl-trait/issue-63279.rs
View file

@ -3,11 +3,11 @@
type Closure = impl FnOnce();
fn c() -> Closure {
//~^ ERROR: expected a `FnOnce<()>` closure, found `()`
//~^ ERROR: expected a `FnOnce()` closure, found `()`
|| -> Closure { || () }
//~^ ERROR: mismatched types
//~| ERROR: mismatched types
//~| ERROR: expected a `FnOnce<()>` closure, found `()`
//~| ERROR: expected a `FnOnce()` closure, found `()`
}
fn main() {}

8
tests/ui/type-alias-impl-trait/issue-63279.stderr
View file

@ -1,17 +1,17 @@
error[E0277]: expected a `FnOnce<()>` closure, found `()`
error[E0277]: expected a `FnOnce()` closure, found `()`
--> $DIR/issue-63279.rs:5:11
|
LL | fn c() -> Closure {
| ^^^^^^^ expected an `FnOnce<()>` closure, found `()`
| ^^^^^^^ expected an `FnOnce()` closure, found `()`
|
= help: the trait `FnOnce<()>` is not implemented for `()`
= note: wrap the `()` in a closure with no arguments: `|| { /* code */ }`
error[E0277]: expected a `FnOnce<()>` closure, found `()`
error[E0277]: expected a `FnOnce()` closure, found `()`
--> $DIR/issue-63279.rs:7:11
|
LL | || -> Closure { || () }
| ^^^^^^^ expected an `FnOnce<()>` closure, found `()`
| ^^^^^^^ expected an `FnOnce()` closure, found `()`
|
= help: the trait `FnOnce<()>` is not implemented for `()`
= note: wrap the `()` in a closure with no arguments: `|| { /* code */ }`

4
tests/ui/unboxed-closures/unboxed-closures-fnmut-as-fn.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<(isize,)>` closure, found `S`
error[E0277]: expected a `Fn(isize)` closure, found `S`
--> $DIR/unboxed-closures-fnmut-as-fn.rs:27:21
|
LL | let x = call_it(&S, 22);
| ------- ^^ expected an `Fn<(isize,)>` closure, found `S`
| ------- ^^ expected an `Fn(isize)` closure, found `S`
| |
| required by a bound introduced by this call
|

6
tests/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `Fn<(&isize,)>` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
error[E0277]: expected a `Fn(&isize)` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
--> $DIR/unboxed-closures-unsafe-extern-fn.rs:20:21
|
LL | let x = call_it(&square, 22);
@ -14,7 +14,7 @@ note: required by a bound in `call_it`
LL | fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
| ^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it`
error[E0277]: expected a `FnMut<(&isize,)>` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
error[E0277]: expected a `FnMut(&isize)` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
--> $DIR/unboxed-closures-unsafe-extern-fn.rs:25:25
|
LL | let y = call_it_mut(&mut square, 22);
@ -30,7 +30,7 @@ note: required by a bound in `call_it_mut`
LL | fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
| ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_mut`
error[E0277]: expected a `FnOnce<(&isize,)>` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
error[E0277]: expected a `FnOnce(&isize)` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
--> $DIR/unboxed-closures-unsafe-extern-fn.rs:30:26
|
LL | let z = call_it_once(square, 22);

12
tests/ui/unboxed-closures/unboxed-closures-wrong-abi.stderr
View file

@ -1,8 +1,8 @@
error[E0277]: expected a `Fn<(&isize,)>` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
error[E0277]: expected a `Fn(&isize)` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
--> $DIR/unboxed-closures-wrong-abi.rs:20:21
|
LL | let x = call_it(&square, 22);
| ------- ^^^^^^^ expected an `Fn<(&isize,)>` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
| ------- ^^^^^^^ expected an `Fn(&isize)` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
| |
| required by a bound introduced by this call
|
@ -13,11 +13,11 @@ note: required by a bound in `call_it`
LL | fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
| ^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it`
error[E0277]: expected a `FnMut<(&isize,)>` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
error[E0277]: expected a `FnMut(&isize)` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
--> $DIR/unboxed-closures-wrong-abi.rs:25:25
|
LL | let y = call_it_mut(&mut square, 22);
| ----------- ^^^^^^^^^^^ expected an `FnMut<(&isize,)>` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
| ----------- ^^^^^^^^^^^ expected an `FnMut(&isize)` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
| |
| required by a bound introduced by this call
|
@ -28,11 +28,11 @@ note: required by a bound in `call_it_mut`
LL | fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
| ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_mut`
error[E0277]: expected a `FnOnce<(&isize,)>` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
error[E0277]: expected a `FnOnce(&isize)` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
--> $DIR/unboxed-closures-wrong-abi.rs:30:26
|
LL | let z = call_it_once(square, 22);
| ------------ ^^^^^^ expected an `FnOnce<(&isize,)>` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
| ------------ ^^^^^^ expected an `FnOnce(&isize)` closure, found `for<'a> extern "C" fn(&'a isize) -> isize {square}`
| |
| required by a bound introduced by this call
|

6
tests/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `Fn<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
error[E0277]: expected a `Fn(&isize)` closure, found `unsafe fn(isize) -> isize {square}`
--> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:21:21
|
LL | let x = call_it(&square, 22);
@ -14,7 +14,7 @@ note: required by a bound in `call_it`
LL | fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
| ^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it`
error[E0277]: expected a `FnMut<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
error[E0277]: expected a `FnMut(&isize)` closure, found `unsafe fn(isize) -> isize {square}`
--> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:26:25
|
LL | let y = call_it_mut(&mut square, 22);
@ -30,7 +30,7 @@ note: required by a bound in `call_it_mut`
LL | fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
| ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_mut`
error[E0277]: expected a `FnOnce<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
error[E0277]: expected a `FnOnce(&isize)` closure, found `unsafe fn(isize) -> isize {square}`
--> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:31:26
|
LL | let z = call_it_once(square, 22);

2
tests/ui/unsafe/initializing-ranged-via-ctor.stderr
View file

@ -1,4 +1,4 @@
error[E0277]: expected a `FnOnce<({integer},)>` closure, found `unsafe fn(u8) -> NonZeroAndOneU8 {NonZeroAndOneU8}`
error[E0277]: expected a `FnOnce({integer})` closure, found `unsafe fn(u8) -> NonZeroAndOneU8 {NonZeroAndOneU8}`
--> $DIR/initializing-ranged-via-ctor.rs:9:34
|
LL | println!("{:?}", Some(1).map(NonZeroAndOneU8).unwrap());