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Rollup merge of #101394 - CAD97:patch-3, r=Mark-Simulacrum

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Forbid mixing `System` with direct sytem allocator calls

e.g. [on windows](dec689432f/library/std/src/sys/windows/alloc.rs (L129-L178)), trying to mix `System::alloc` and `HeapFree` will not work because of the extra work done to serve higher alignments.
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Matthias Krüger 2022-09-04 18:55:46 +02:00 committed by GitHub
commit 723f0c477b
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library/std/src/alloc.rs
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@ -68,7 +68,10 @@ pub use alloc_crate::alloc::*;
/// The default memory allocator provided by the operating system.
///
/// This is based on `malloc` on Unix platforms and `HeapAlloc` on Windows,
/// plus related functions.
/// plus related functions. However, it is not valid to mix use of the backing
/// system allocator with `System`, as this implementation may include extra
/// work, such as to serve alignment requests greater than the alignment
/// provided directly by the backing system allocator.
///
/// This type implements the `GlobalAlloc` trait and Rust programs by default
/// work as if they had this definition: