Auto merge of #55347 - pietroalbini:rollup, r=pietroalbini

Rollup of 22 pull requests

Successful merges:

 - #53507 (Add doc for impl From for Waker)
 - #53931 (Gradually expanding libstd's keyword documentation)
 - #54965 (update tcp stream documentation)
 - #54977 (Accept `Option<Box<$t:ty>>` in macro argument)
 - #55138 (in which unused-parens suggestions heed what the user actually wrote)
 - #55173 (Suggest appropriate syntax on missing lifetime specifier in return type)
 - #55200 (Documents `From` implementations for `Stdio`)
 - #55245 (submodules: update clippy from 5afdf8b7 to b1d03437)
 - #55247 (Clarified code example in char primitive doc)
 - #55251 (Fix a typo in the documentation of RangeInclusive)
 - #55253 (only issue "variant of the expected type" suggestion for enums)
 - #55254 (Correct trailing ellipsis in name_from_pat)
 - #55269 (fix typos in various places)
 - #55282 (Remove redundant clone)
 - #55285 (Do some copy editing on the release notes)
 - #55291 (Update stdsimd submodule)
 - #55296 (Set RUST_BACKTRACE=0 for rustdoc-ui/failed-doctest-output.rs)
 - #55306 (Regression test for #54478.)
 - #55328 (Fix doc for new copysign functions)
 - #55340 (Operands no longer appear in places)
 - #55345 (Remove is_null)
 - #55348 (Update RELEASES.md after destabilization of non_modrs_mods)

Failed merges:

r? @ghost

1 files changed, 42 insertions, 0 deletions

diff --git a/src/test/rustdoc/issue-54478-demo-allocator.rs b/src/test/rustdoc/issue-54478-demo-allocator.rs
new file mode 100644
index 00000000000..4811f363bc9
--- /dev/null
+++ b/src/test/rustdoc/issue-54478-demo-allocator.rs
@@ -0,0 +1,42 @@
+// Issue #54478: regression test showing that we can demonstrate
+// `#[global_allocator]` in code blocks built by `rustdoc`.
+//
+// ## Background
+//
+// Changes in lang-item visibility injected failures that were only
+// exposed when compiling with `-C prefer-dynamic`. But `rustdoc` used
+// `-C prefer-dynamic` (and had done so for years, for reasons we did
+// not document at that time).
+//
+// Rather than try to revise the visbility semanics, we instead
+// decided to change `rustdoc` to behave more like the compiler's
+// default setting, by leaving off `-C prefer-dynamic`.
+
+// compile-flags:--test
+
+//! This is a doc comment
+//!
+//! ```rust
+//! use std::alloc::*;
+//!
+//! #[global_allocator]
+//! static ALLOC: A = A;
+//!
+//! static mut HIT: bool = false;
+//!
+//! struct A;
+//!
+//! unsafe impl GlobalAlloc for A {
+//!     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+//!         HIT = true;
+//!         System.alloc(layout)
+//!     }
+//!     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
+//!         System.dealloc(ptr, layout);
+//!     }
+//! }
+//!
+//! fn main() {
+//!     assert!(unsafe { HIT });
+//! }
+//! ```