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Forbid mixing System with direct system allocator calls #101394

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Sep 4, 2022
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Forbid mixing System with direct system allocator calls #101394

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5 changes: 4 additions & 1 deletion library/std/src/alloc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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:
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