Auto merge of #74569 - Manishearth:rollup-hkn5ex9, r=Manishearth

Rollup of 13 pull requests

Successful merges:

 - #72714 (Fix debug assertion in typeck)
 - #73197 (Impl Default for ranges)
 - #73323 (wf: check foreign fn decls for well-formedness)
 - #74051 (disallow non-static lifetimes in const generics)
 - #74376 (test caching opt_const_param_of on disc)
 - #74501 (Ayu theme: Use different background color for Run button)
 - #74505 (Fix search input focus in ayu theme)
 - #74522 (Update sanitizer docs)
 - #74546 (Fix duplicate maybe_uninit_extra attribute)
 - #74552 (Stabilize TAU constant.)
 - #74555 (Improve "important traits" popup display on mobile)
 - #74557 (Fix an ICE on an invalid `binding @ ...` in a tuple struct pattern)
 - #74561 (update backtrace-rs)

Failed merges:

r? @ghost

Author: bors

src/backtrace

@@ -26,6 +26,9 @@ of bugs:
 * Double-free, invalid free
 * Memory leaks
 
+The memory leak detection is enabled by default on Linux, and can be enabled
+with runtime flag `ASAN_OPTIONS=detect_leaks=1` on macOS.
+
 AddressSanitizer is supported on the following targets:
 
 * `x86_64-apple-darwin`
@@ -196,10 +199,6 @@ fn main() {
 
 ```shell
 $ export \
-  CC=clang \
-  CXX=clang++ \
-  CFLAGS='-fsanitize=memory -fsanitize-memory-track-origins' \
-  CXXFLAGS='-fsanitize=memory -fsanitize-memory-track-origins' \
   RUSTFLAGS='-Zsanitizer=memory -Zsanitizer-memory-track-origins' \
   RUSTDOCFLAGS='-Zsanitizer=memory -Zsanitizer-memory-track-origins'
 $ cargo clean

src/doc/unstable-book/src/compiler-flags/sanitizer.md

@@ -242,7 +242,7 @@ pub mod consts {
     /// The full circle constant (τ)
     ///
     /// Equal to 2π.
-    #[unstable(feature = "tau_constant", issue = "66770")]
+    #[stable(feature = "tau_constant", since = "1.47.0")]
     pub const TAU: f32 = 6.28318530717958647692528676655900577_f32;
 
     /// π/2

src/libcore/num/f32.rs

@@ -242,7 +242,7 @@ pub mod consts {
     /// The full circle constant (τ)
     ///
     /// Equal to 2π.
-    #[unstable(feature = "tau_constant", issue = "66770")]
+    #[stable(feature = "tau_constant", since = "1.47.0")]
     pub const TAU: f64 = 6.28318530717958647692528676655900577_f64;
 
     /// π/2

src/libcore/num/f64.rs

@@ -39,7 +39,7 @@ use crate::hash::Hash;
 /// [`Iterator`]: ../iter/trait.IntoIterator.html
 /// [slicing index]: ../slice/trait.SliceIndex.html
 #[doc(alias = "..")]
-#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+#[derive(Copy, Clone, Default, PartialEq, Eq, Hash)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct RangeFull;
 
@@ -71,7 +71,7 @@ impl fmt::Debug for RangeFull {
 /// assert_eq!(arr[1..=3], [  1,2,3  ]);
 /// ```
 #[doc(alias = "..")]
-#[derive(Clone, PartialEq, Eq, Hash)] // not Copy -- see #27186
+#[derive(Clone, Default, PartialEq, Eq, Hash)] // not Copy -- see #27186
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Range<Idx> {
     /// The lower bound of the range (inclusive).

src/libcore/ops/range.rs

@@ -453,6 +453,7 @@ E0767: include_str!("./error_codes/E0767.md"),
 E0768: include_str!("./error_codes/E0768.md"),
 E0769: include_str!("./error_codes/E0769.md"),
 E0770: include_str!("./error_codes/E0770.md"),
+E0771: include_str!("./error_codes/E0771.md"),
 ;
 //  E0006, // merged with E0005
 //  E0008, // cannot bind by-move into a pattern guard

src/librustc_error_codes/error_codes.rs

@@ -0,0 +1,23 @@
+A non-`'static` lifetime was used in a const generic. This is currently not
+allowed.
+
+Erroneous code example:
+
+```compile_fail,E0771
+#![feature(const_generics)]
+
+fn function_with_str<'a, const STRING: &'a str>() {} // error!
+```
+
+To fix this issue, the lifetime in the const generic need to be changed to
+`'static`:
+
+```
+#![feature(const_generics)]
+
+fn function_with_str<const STRING: &'static str>() {} // ok!
+```
+
+For more information, see [GitHub issue #74052].
+
+[GitHub issue #74052]: https://github.com/rust-lang/rust/issues/74052

src/librustc_error_codes/error_codes/E0771.md

@@ -103,9 +103,13 @@ rustc_queries! {
         /// // ^ While calling `opt_const_param_of` for other bodies returns `None`.
         /// }
         /// ```
+        // It looks like caching this query on disk actually slightly
+        // worsened performance in #74376.
+        //
+        // Once const generics are more prevalently used, we might want to
+        // consider only caching calls returning `Some`.
         query opt_const_param_of(key: LocalDefId) -> Option<DefId> {
             desc { |tcx| "computing the optional const parameter of `{}`", tcx.def_path_str(key.to_def_id()) }
-            // FIXME(#74113): consider storing this query on disk.
         }
 
         /// Records the type of every item.

src/librustc_middle/query/mod.rs

@@ -1500,11 +1500,17 @@ impl<'a, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
         pat_src: PatternSource,
         bindings: &mut SmallVec<[(PatBoundCtx, FxHashSet<Ident>); 1]>,
     ) {
+        let is_tuple_struct_pat = matches!(pat.kind, PatKind::TupleStruct(_, _));
+
         // Visit all direct subpatterns of this pattern.
         pat.walk(&mut |pat| {
             debug!("resolve_pattern pat={:?} node={:?}", pat, pat.kind);
             match pat.kind {
-                PatKind::Ident(bmode, ident, ref sub) => {
+                // In tuple struct patterns ignore the invalid `ident @ ...`.
+                // It will be handled as an error by the AST lowering.
+                PatKind::Ident(bmode, ident, ref sub)
+                    if !(is_tuple_struct_pat && sub.as_ref().filter(|p| p.is_rest()).is_some()) =>
+                {
                     // First try to resolve the identifier as some existing entity,
                     // then fall back to a fresh binding.
                     let has_sub = sub.is_some();

src/librustc_resolve/late.rs

@@ -1141,6 +1141,24 @@ impl<'tcx> LifetimeContext<'_, 'tcx> {
         err.emit();
     }
 
+    // FIXME(const_generics): This patches over a ICE caused by non-'static lifetimes in const
+    // generics. We are disallowing this until we can decide on how we want to handle non-'static
+    // lifetimes in const generics. See issue #74052 for discussion.
+    crate fn emit_non_static_lt_in_const_generic_error(&self, lifetime_ref: &hir::Lifetime) {
+        let mut err = struct_span_err!(
+            self.tcx.sess,
+            lifetime_ref.span,
+            E0771,
+            "use of non-static lifetime `{}` in const generic",
+            lifetime_ref
+        );
+        err.note(
+            "for more information, see issue #74052 \
+            <https://github.com/rust-lang/rust/issues/74052>",
+        );
+        err.emit();
+    }
+
     crate fn is_trait_ref_fn_scope(&mut self, trait_ref: &'tcx hir::PolyTraitRef<'tcx>) -> bool {
         if let def::Res::Def(_, did) = trait_ref.trait_ref.path.res {
             if [