Auto merge of #82982 - Dylan-DPC:rollup-mt497z7, r=Dylan-DPC

Rollup of 9 pull requests

Successful merges:

 - #81309 (always eagerly eval consts in Relate)
 - #82217 (Edition-specific preludes)
 - #82807 (rustdoc: Remove redundant enableSearchInput function)
 - #82924 (WASI: Switch to crt1-command.o to enable support for new-style commands)
 - #82949 (Do not attempt to unlock envlock in child process after a fork.)
 - #82955 (fix: wrong word)
 - #82962 (Treat header as first paragraph for shortened markdown descriptions)
 - #82976 (fix error message for copy(_nonoverlapping) overflow)
 - #82977 (Rename `Option::get_or_default` to `get_or_insert_default`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_builtin_macros/src/standard_library_imports.rs

@@ -2,7 +2,7 @@ use rustc_ast as ast;
 use rustc_expand::base::{ExtCtxt, ResolverExpand};
 use rustc_expand::expand::ExpansionConfig;
 use rustc_session::Session;
-use rustc_span::edition::Edition;
+use rustc_span::edition::Edition::*;
 use rustc_span::hygiene::AstPass;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::DUMMY_SP;
@@ -13,7 +13,7 @@ pub fn inject(
     sess: &Session,
     alt_std_name: Option<Symbol>,
 ) -> ast::Crate {
-    let rust_2018 = sess.parse_sess.edition >= Edition::Edition2018;
+    let edition = sess.parse_sess.edition;
 
     // the first name in this list is the crate name of the crate with the prelude
     let names: &[Symbol] = if sess.contains_name(&krate.attrs, sym::no_core) {
@@ -42,7 +42,11 @@ pub fn inject(
 
     // .rev() to preserve ordering above in combination with insert(0, ...)
     for &name in names.iter().rev() {
-        let ident = if rust_2018 { Ident::new(name, span) } else { Ident::new(name, call_site) };
+        let ident = if edition >= Edition2018 {
+            Ident::new(name, span)
+        } else {
+            Ident::new(name, call_site)
+        };
         krate.items.insert(
             0,
             cx.item(
@@ -58,14 +62,18 @@ pub fn inject(
     // the one with the prelude.
     let name = names[0];
 
-    let import_path = if rust_2018 {
+    let root = (edition == Edition2015).then(|| kw::PathRoot);
-        [name, sym::prelude, sym::v1].iter().map(|symbol| Ident::new(*symbol, span)).collect()
+
-    } else {
+    let import_path = root
-        [kw::PathRoot, name, sym::prelude, sym::v1]
+        .iter()
-            .iter()
+        .chain(&[name, sym::prelude])
-            .map(|symbol| Ident::new(*symbol, span))
+        .chain(&[match edition {
-            .collect()
+            Edition2015 => sym::rust_2015,
-    };
+            Edition2018 => sym::rust_2018,
+            Edition2021 => sym::rust_2021,
+        }])
+        .map(|&symbol| Ident::new(symbol, span))
+        .collect();
 
     let use_item = cx.item(
         span,

compiler/rustc_middle/src/ty/relate.rs

@@ -421,12 +421,14 @@ pub fn super_relate_tys<R: TypeRelation<'tcx>>(
             let t = relation.relate(a_t, b_t)?;
             match relation.relate(sz_a, sz_b) {
                 Ok(sz) => Ok(tcx.mk_ty(ty::Array(t, sz))),
-                // FIXME(#72219) Implement improved diagnostics for mismatched array
-                // length?
-                Err(err) if relation.tcx().lazy_normalization() => Err(err),
                 Err(err) => {
                     // Check whether the lengths are both concrete/known values,
                     // but are unequal, for better diagnostics.
+                    //
+                    // It might seem dubious to eagerly evaluate these constants here,
+                    // we however cannot end up with errors in `Relate` during both
+                    // `type_of` and `predicates_of`. This means that evaluating the
+                    // constants should not cause cycle errors here.
                     let sz_a = sz_a.try_eval_usize(tcx, relation.param_env());
                     let sz_b = sz_b.try_eval_usize(tcx, relation.param_env());
                     match (sz_a, sz_b) {

compiler/rustc_mir/src/interpret/step.rs

@@ -160,7 +160,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         let layout = self.layout_of(src.layout.ty.builtin_deref(true).unwrap().ty)?;
         let (size, align) = (layout.size, layout.align.abi);
         let size = size.checked_mul(count, self).ok_or_else(|| {
-            err_ub_format!("overflow computing total size of `copy_nonoverlapping`")
+            err_ub_format!(
+                "overflow computing total size of `{}`",
+                if nonoverlapping { "copy_nonoverlapping" } else { "copy" }
+            )
         })?;
 
         // Make sure we check both pointers for an access of the total size and aligment,

compiler/rustc_mir/src/lib.rs

@@ -25,7 +25,7 @@ Rust MIR: a lowered representation of Rust.
 #![feature(stmt_expr_attributes)]
 #![feature(trait_alias)]
 #![feature(option_expect_none)]
-#![feature(option_get_or_default)]
+#![feature(option_get_or_insert_default)]
 #![feature(or_patterns)]
 #![feature(once_cell)]
 #![feature(control_flow_enum)]

compiler/rustc_mir/src/transform/coverage/graph.rs

@@ -392,7 +392,8 @@ impl BasicCoverageBlockData {
             }
         }
         let operand = counter_kind.as_operand_id();
-        if let Some(replaced) = self.edge_from_bcbs.get_or_default().insert(from_bcb, counter_kind)
+        if let Some(replaced) =
+            self.edge_from_bcbs.get_or_insert_default().insert(from_bcb, counter_kind)
         {
             Error::from_string(format!(
                 "attempt to set an edge counter more than once; from_bcb: \

compiler/rustc_span/src/edition.rs

@@ -20,7 +20,7 @@ pub enum Edition {
     Edition2015,
     /// The 2018 edition
     Edition2018,
-    /// The 2021 ediiton
+    /// The 2021 edition
     Edition2021,
 }
 

compiler/rustc_span/src/symbol.rs

@@ -959,8 +959,11 @@ symbols! {
         rt,
         rtm_target_feature,
         rust,
+        rust_2015,
         rust_2015_preview,
+        rust_2018,
         rust_2018_preview,
+        rust_2021,
         rust_2021_preview,
         rust_begin_unwind,
         rust_eh_catch_typeinfo,

compiler/rustc_target/src/spec/crt_objects.rs

@@ -108,11 +108,13 @@ pub(super) fn post_mingw() -> CrtObjects {
 }
 
 pub(super) fn pre_wasi_fallback() -> CrtObjects {
+    // Use crt1-command.o instead of crt1.o to enable support for new-style
+    // commands. See https://reviews.llvm.org/D81689 for more info.
     new(&[
-        (LinkOutputKind::DynamicNoPicExe, &["crt1.o"]),
+        (LinkOutputKind::DynamicNoPicExe, &["crt1-command.o"]),
-        (LinkOutputKind::DynamicPicExe, &["crt1.o"]),
+        (LinkOutputKind::DynamicPicExe, &["crt1-command.o"]),
-        (LinkOutputKind::StaticNoPicExe, &["crt1.o"]),
+        (LinkOutputKind::StaticNoPicExe, &["crt1-command.o"]),
-        (LinkOutputKind::StaticPicExe, &["crt1.o"]),
+        (LinkOutputKind::StaticPicExe, &["crt1-command.o"]),
         (LinkOutputKind::WasiReactorExe, &["crt1-reactor.o"]),
     ])
 }

library/core/src/option.rs

@@ -854,34 +854,6 @@ impl<T> Option<T> {
     // Entry-like operations to insert if None and return a reference
     /////////////////////////////////////////////////////////////////////////
 
-    /// Inserts the default value into the option if it is [`None`], then
-    /// returns a mutable reference to the contained value.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// #![feature(option_get_or_default)]
-    ///
-    /// let mut x = None;
-    ///
-    /// {
-    ///     let y: &mut u32 = x.get_or_default();
-    ///     assert_eq!(y, &0);
-    ///
-    ///     *y = 7;
-    /// }
-    ///
-    /// assert_eq!(x, Some(7));
-    /// ```
-    #[inline]
-    #[unstable(feature = "option_get_or_default", issue = "82901")]
-    pub fn get_or_default(&mut self) -> &mut T
-    where
-        T: Default,
-    {
-        self.get_or_insert_with(Default::default)
-    }
-
     /// Inserts `value` into the option if it is [`None`], then
     /// returns a mutable reference to the contained value.
     ///
@@ -905,6 +877,34 @@ impl<T> Option<T> {
         self.get_or_insert_with(|| value)
     }
 
+    /// Inserts the default value into the option if it is [`None`], then
+    /// returns a mutable reference to the contained value.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(option_get_or_insert_default)]
+    ///
+    /// let mut x = None;
+    ///
+    /// {
+    ///     let y: &mut u32 = x.get_or_insert_default();
+    ///     assert_eq!(y, &0);
+    ///
+    ///     *y = 7;
+    /// }
+    ///
+    /// assert_eq!(x, Some(7));
+    /// ```
+    #[inline]
+    #[unstable(feature = "option_get_or_insert_default", issue = "82901")]
+    pub fn get_or_insert_default(&mut self) -> &mut T
+    where
+        T: Default,
+    {
+        self.get_or_insert_with(Default::default)
+    }
+
     /// Inserts a value computed from `f` into the option if it is [`None`],
     /// then returns a mutable reference to the contained value.
     ///

library/core/src/prelude/mod.rs

@@ -1,5 +1,41 @@
 //! The libcore prelude
+//!
+//! This module is intended for users of libcore which do not link to libstd as
+//! well. This module is imported by default when `#![no_std]` is used in the
+//! same manner as the standard library's prelude.
 
 #![stable(feature = "core_prelude", since = "1.4.0")]
 
 pub mod v1;
+
+/// The 2015 version of the core prelude.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2015", issue = "none")]
+pub mod rust_2015 {
+    #[unstable(feature = "prelude_2015", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2018 version of the core prelude.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2018", issue = "none")]
+pub mod rust_2018 {
+    #[unstable(feature = "prelude_2018", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2021 version of the core prelude.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2021", issue = "none")]
+pub mod rust_2021 {
+    #[unstable(feature = "prelude_2021", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+
+    // FIXME: Add more things.
+}

library/core/src/prelude/v1.rs

@@ -1,8 +1,6 @@
-//! The core prelude
+//! The first version of the core prelude.
 //!
-//! This module is intended for users of libcore which do not link to libstd as
+//! See the [module-level documentation](super) for more.
-//! well. This module is imported by default when `#![no_std]` is used in the
-//! same manner as the standard library's prelude.
 
 #![stable(feature = "core_prelude", since = "1.4.0")]
 

library/std/src/lib.rs

@@ -302,6 +302,7 @@
 #![feature(panic_internals)]
 #![feature(panic_unwind)]
 #![feature(pin_static_ref)]
+#![feature(prelude_2021)]
 #![feature(prelude_import)]
 #![feature(ptr_internals)]
 #![feature(raw)]

library/std/src/prelude/mod.rs

@@ -84,3 +84,37 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 pub mod v1;
+
+/// The 2015 version of the prelude of The Rust Standard Library.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2015", issue = "none")]
+pub mod rust_2015 {
+    #[unstable(feature = "prelude_2015", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2018 version of the prelude of The Rust Standard Library.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2018", issue = "none")]
+pub mod rust_2018 {
+    #[unstable(feature = "prelude_2018", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2021 version of the prelude of The Rust Standard Library.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2021", issue = "none")]
+pub mod rust_2021 {
+    #[unstable(feature = "prelude_2021", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+
+    #[unstable(feature = "prelude_2021", issue = "none")]
+    #[doc(no_inline)]
+    pub use core::prelude::rust_2021::*;
+}

library/std/src/prelude/v1.rs

@@ -1,6 +1,6 @@
 //! The first version of the prelude of The Rust Standard Library.
 //!
-//! See the [module-level documentation](../index.html) for more.
+//! See the [module-level documentation](super) for more.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 

library/std/src/sys/unix/ext/process.rs

@@ -62,9 +62,14 @@ pub trait CommandExt: Sealed {
     /// `fork`. This primarily means that any modifications made to memory on
     /// behalf of this closure will **not** be visible to the parent process.
     /// This is often a very constrained environment where normal operations
-    /// like `malloc` or acquiring a mutex are not guaranteed to work (due to
+    /// like `malloc`, accessing environment variables through [`std::env`]
+    /// or acquiring a mutex are not guaranteed to work (due to
     /// other threads perhaps still running when the `fork` was run).
     ///
+    /// For further details refer to the [POSIX fork() specification]
+    /// and the equivalent documentation for any targeted
+    /// platform, especially the requirements around *async-signal-safety*.
+    ///
     /// This also means that all resources such as file descriptors and
     /// memory-mapped regions got duplicated. It is your responsibility to make
     /// sure that the closure does not violate library invariants by making
@@ -73,6 +78,10 @@ pub trait CommandExt: Sealed {
     /// When this closure is run, aspects such as the stdio file descriptors and
     /// working directory have successfully been changed, so output to these
     /// locations may not appear where intended.
+    ///
+    /// [POSIX fork() specification]:
+    ///     https://pubs.opengroup.org/onlinepubs/9699919799/functions/fork.html
+    /// [`std::env`]: mod@crate::env
     #[stable(feature = "process_pre_exec", since = "1.34.0")]
     unsafe fn pre_exec<F>(&mut self, f: F) -> &mut process::Command
     where

library/std/src/sys/unix/process/process_unix.rs

@@ -1,6 +1,7 @@
 use crate::convert::TryInto;
 use crate::fmt;
 use crate::io::{self, Error, ErrorKind};
+use crate::mem;
 use crate::ptr;
 use crate::sys;
 use crate::sys::cvt;
@@ -45,15 +46,14 @@ impl Command {
         //
         // Note that as soon as we're done with the fork there's no need to hold
         // a lock any more because the parent won't do anything and the child is
-        // in its own process.
+        // in its own process. Thus the parent drops the lock guard while the child
-        let result = unsafe {
+        // forgets it to avoid unlocking it on a new thread, which would be invalid.
-            let _env_lock = sys::os::env_lock();
+        let (env_lock, result) = unsafe { (sys::os::env_lock(), cvt(libc::fork())?) };
-            cvt(libc::fork())?
-        };
 
         let pid = unsafe {
             match result {
                 0 => {
+                    mem::forget(env_lock);
                     drop(input);
                     let Err(err) = self.do_exec(theirs, envp.as_ref());
                     let errno = err.raw_os_error().unwrap_or(libc::EINVAL) as u32;
@@ -74,7 +74,10 @@ impl Command {
                     rtassert!(output.write(&bytes).is_ok());
                     libc::_exit(1)
                 }
-                n => n,
+                n => {
+                    drop(env_lock);
+                    n
+                }
             }
         };
 

src/bootstrap/compile.rs

@@ -210,7 +210,7 @@ fn copy_self_contained_objects(
                 panic!("Target {:?} does not have a \"wasi-root\" key", target.triple)
             })
             .join("lib/wasm32-wasi");
-        for &obj in &["crt1.o", "crt1-reactor.o"] {
+        for &obj in &["crt1-command.o", "crt1-reactor.o"] {
             copy_and_stamp(
                 builder,
                 &libdir_self_contained,

src/librustdoc/html/markdown.rs

@@ -1093,6 +1093,7 @@ fn markdown_summary_with_limit(md: &str, length_limit: usize) -> (String, bool)
                 Tag::Emphasis => s.push_str("</em>"),
                 Tag::Strong => s.push_str("</strong>"),
                 Tag::Paragraph => break,
+                Tag::Heading(..) => break,
                 _ => {}
             },
             Event::HardBreak | Event::SoftBreak => {

src/librustdoc/html/markdown/tests.rs

@@ -235,6 +235,7 @@ fn test_short_markdown_summary() {
     t("code `let x = i32;` ...", "code <code>let x = i32;</code> …");
     t("type `Type<'static>` ...", "type <code>Type<'static></code> …");
     t("# top header", "top header");
+    t("# top header\n\nfollowed by a paragraph", "top header");
     t("## header", "header");
     t("first paragraph\n\nsecond paragraph", "first paragraph");
     t("```\nfn main() {}\n```", "");

src/librustdoc/html/render/mod.rs

@@ -286,11 +286,7 @@ impl Serialize for TypeWithKind {
     where
         S: Serializer,
     {
-        let mut seq = serializer.serialize_seq(None)?;
+        (&self.ty.name, ItemType::from(self.kind)).serialize(serializer)
-        seq.serialize_element(&self.ty.name)?;
-        let x: ItemType = self.kind.into();
-        seq.serialize_element(&x)?;
-        seq.end()
     }
 }
 

src/librustdoc/html/static/main.js

@@ -2188,7 +2188,7 @@ function defocusSearchBar() {
             return "+";
         }
         // button will collapse the section
-        // note that this text is also set in the HTML template in render.rs
+        // note that this text is also set in the HTML template in ../render/mod.rs
         return "\u2212"; // "\u2212" is "−" minus sign
     }
 
@@ -2831,17 +2831,10 @@ function defocusSearchBar() {
         });
     }
 
-    function enableSearchInput() {
-        if (search_input) {
-            search_input.removeAttribute('disabled');
-        }
-    }
-
     function addSearchOptions(crates) {
         var elem = document.getElementById("crate-search");
 
         if (!elem) {
-            enableSearchInput();
             return;
         }
         var savedCrate = getSettingValue("saved-filter-crate");
@@ -2860,7 +2853,6 @@ function defocusSearchBar() {
                 elem.value = savedCrate;
             }
         }
-        enableSearchInput();
     };
 
     function buildHelperPopup() {
@@ -2952,7 +2944,7 @@ function defocusSearchBar() {
         search_input.addEventListener("blur", function() {
             search_input.placeholder = search_input.origPlaceholder;
         });
-        enableSearchInput();
+        search_input.removeAttribute('disabled');
 
         var crateSearchDropDown = document.getElementById("crate-search");
         crateSearchDropDown.addEventListener("focus", loadSearch);

src/test/pretty/asm.pp

@@ -2,7 +2,7 @@
 #![no_std]
 #![feature(asm)]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 

src/test/pretty/cast-lt.pp

@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only

src/test/pretty/dollar-crate.pp

@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only

src/test/pretty/expanded-and-path-remap-80832.pp

@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // Test for issue 80832

src/test/pretty/issue-12590-c.pp

@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only

src/test/pretty/issue-4264.pp

@@ -1,5 +1,5 @@
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only

src/test/ui/ast-json/ast-json-output.stdout

@@ -1 +1 @@
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src/test/ui/command/command-pre-exec.rs

@@ -43,20 +43,6 @@ fn main() {
     assert!(output.stderr.is_empty());
     assert_eq!(output.stdout, b"hello\nhello2\n");
 
-    let output = unsafe {
-        Command::new(&me)
-            .arg("test2")
-            .pre_exec(|| {
-                env::set_var("FOO", "BAR");
-                Ok(())
-            })
-            .output()
-            .unwrap()
-    };
-    assert!(output.status.success());
-    assert!(output.stderr.is_empty());
-    assert!(output.stdout.is_empty());
-
     let output = unsafe {
         Command::new(&me)
             .arg("test3")

src/test/ui/const-generics/const-argument-cross-crate-mismatch.full.stderr

@@ -1,11 +1,11 @@
 error[E0308]: mismatched types
-  --> $DIR/const-argument-cross-crate-mismatch.rs:7:67
+  --> $DIR/const-argument-cross-crate-mismatch.rs:9:67
    |
 LL |     let _ = const_generic_lib::function(const_generic_lib::Struct([0u8, 1u8]));
    |                                                                   ^^^^^^^^^^ expected an array with a fixed size of 3 elements, found one with 2 elements
 
 error[E0308]: mismatched types
-  --> $DIR/const-argument-cross-crate-mismatch.rs:9:65
+  --> $DIR/const-argument-cross-crate-mismatch.rs:11:65
    |
 LL |     let _: const_generic_lib::Alias = const_generic_lib::Struct([0u8, 1u8, 2u8]);
    |                                                                 ^^^^^^^^^^^^^^^ expected an array with a fixed size of 2 elements, found one with 3 elements

src/test/ui/const-generics/const-argument-cross-crate-mismatch.min.stderr

@@ -1,11 +1,11 @@
 error[E0308]: mismatched types
-  --> $DIR/const-argument-cross-crate-mismatch.rs:7:67
+  --> $DIR/const-argument-cross-crate-mismatch.rs:9:67
    |
 LL |     let _ = const_generic_lib::function(const_generic_lib::Struct([0u8, 1u8]));
    |                                                                   ^^^^^^^^^^ expected an array with a fixed size of 3 elements, found one with 2 elements
 
 error[E0308]: mismatched types
-  --> $DIR/const-argument-cross-crate-mismatch.rs:9:65
+  --> $DIR/const-argument-cross-crate-mismatch.rs:11:65
    |
 LL |     let _: const_generic_lib::Alias = const_generic_lib::Struct([0u8, 1u8, 2u8]);
    |                                                                 ^^^^^^^^^^^^^^^ expected an array with a fixed size of 2 elements, found one with 3 elements

src/test/ui/const-generics/const-argument-cross-crate-mismatch.rs

@@ -1,5 +1,7 @@
 // aux-build:const_generic_lib.rs
 // revisions: full min
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
 
 extern crate const_generic_lib;
 

src/test/ui/consts/copy-intrinsic.rs

@@ -1,6 +1,6 @@
 // ignore-tidy-linelength
 #![feature(const_mut_refs, const_intrinsic_copy, const_ptr_offset)]
-use std::ptr;
+use std::{ptr, mem};
 
 const COPY_ZERO: () = unsafe {
     // Since we are not copying anything, this should be allowed.
@@ -26,6 +26,20 @@ const COPY_OOB_2: () = unsafe {
     //~| previously accepted
 };
 
+const COPY_SIZE_OVERFLOW: () = unsafe {
+    let x = 0;
+    let mut y = 0;
+    ptr::copy(&x, &mut y, 1usize << (mem::size_of::<usize>() * 8 - 1)); //~ ERROR any use of this value will cause an error
+    //~| overflow computing total size of `copy`
+    //~| previously accepted
+};
+const COPY_NONOVERLAPPING_SIZE_OVERFLOW: () = unsafe {
+    let x = 0;
+    let mut y = 0;
+    ptr::copy_nonoverlapping(&x, &mut y, 1usize << (mem::size_of::<usize>() * 8 - 1)); //~ ERROR any use of this value will cause an error
+    //~| overflow computing total size of `copy_nonoverlapping`
+    //~| previously accepted
+};
 
 fn main() {
 }

src/test/ui/consts/copy-intrinsic.stderr

@@ -33,5 +33,37 @@ LL | | };
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
 
-error: aborting due to 2 previous errors
+error: any use of this value will cause an error
+  --> $DIR/copy-intrinsic.rs:32:5
+   |
+LL | / const COPY_SIZE_OVERFLOW: () = unsafe {
+LL | |     let x = 0;
+LL | |     let mut y = 0;
+LL | |     ptr::copy(&x, &mut y, 1usize << (mem::size_of::<usize>() * 8 - 1));
+   | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overflow computing total size of `copy`
+LL | |
+LL | |
+LL | | };
+   | |__-
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
+
+error: any use of this value will cause an error
+  --> $DIR/copy-intrinsic.rs:39:5
+   |
+LL | / const COPY_NONOVERLAPPING_SIZE_OVERFLOW: () = unsafe {
+LL | |     let x = 0;
+LL | |     let mut y = 0;
+LL | |     ptr::copy_nonoverlapping(&x, &mut y, 1usize << (mem::size_of::<usize>() * 8 - 1));
+   | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overflow computing total size of `copy_nonoverlapping`
+LL | |
+LL | |
+LL | | };
+   | |__-
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
+
+error: aborting due to 4 previous errors
 

src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.stderr

@@ -24,10 +24,10 @@ LL |         extern crate std as Vec;
 LL | define_vec!();
    | -------------- in this macro invocation
 note: `Vec` could also refer to the struct defined here
-  --> $SRC_DIR/std/src/prelude/v1.rs:LL:COL
+  --> $SRC_DIR/std/src/prelude/mod.rs:LL:COL
    |
-LL | pub use crate::vec::Vec;
+LL |     pub use super::v1::*;
-   |         ^^^^^^^^^^^^^^^
+   |             ^^^^^^^^^^^^
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 2 previous errors

src/test/ui/issues/issue-27033.stderr

@@ -4,10 +4,10 @@ error[E0530]: match bindings cannot shadow unit variants
 LL |         None @ _ => {}
    |         ^^^^ cannot be named the same as a unit variant
    | 
-  ::: $SRC_DIR/std/src/prelude/v1.rs:LL:COL
+  ::: $SRC_DIR/std/src/prelude/mod.rs:LL:COL
    |
-LL | pub use crate::option::Option::{self, None, Some};
+LL |     pub use super::v1::*;
-   |                                       ---- the unit variant `None` is defined here
+   |             ------------ the unit variant `None` is defined here
 
 error[E0530]: match bindings cannot shadow constants
   --> $DIR/issue-27033.rs:7:9

src/test/ui/issues/issue-60662.stdout

@@ -3,7 +3,7 @@
 
 #![feature(type_alias_impl_trait)]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 

src/test/ui/proc-macro/meta-macro-hygiene.stdout

@@ -15,7 +15,7 @@ Respanned: TokenStream [Ident { ident: "$crate", span: $DIR/auxiliary/make-macro
 
 #![no_std /* 0#0 */]
 #[prelude_import /* 0#1 */]
-use core /* 0#1 */::prelude /* 0#1 */::v1 /* 0#1 */::*;
+use core /* 0#1 */::prelude /* 0#1 */::rust_2018 /* 0#1 */::*;
 #[macro_use /* 0#1 */]
 extern crate core /* 0#1 */;
 #[macro_use /* 0#1 */]

src/test/ui/proc-macro/nonterminal-token-hygiene.stdout

@@ -35,7 +35,7 @@ PRINT-BANG INPUT (DEBUG): TokenStream [
 
 #![no_std /* 0#0 */]
 #[prelude_import /* 0#1 */]
-use ::core /* 0#1 */::prelude /* 0#1 */::v1 /* 0#1 */::*;
+use ::core /* 0#1 */::prelude /* 0#1 */::rust_2015 /* 0#1 */::*;
 #[macro_use /* 0#1 */]
 extern crate core /* 0#2 */;
 #[macro_use /* 0#1 */]

src/test/ui/rfc-2497-if-let-chains/ast-pretty-check.stdout

@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // build-pass (FIXME(62277): could be check-pass?)