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Fix safety comment #80774

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Jan 10, 2021
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Fix safety comment #80774

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5 changes: 3 additions & 2 deletions library/std/src/alloc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -166,8 +166,9 @@ impl System {
match old_layout.size() {
0 => self.alloc_impl(new_layout, zeroed),

// SAFETY: `new_size` is non-zero as `old_size` is greater than or equal to `new_size`
// as required by safety conditions. Other conditions must be upheld by the caller
// SAFETY: `new_size` is non-zero as `new_size` is greater than or equal to `old_size`
// as required by safety conditions and the `old_size == 0` case was handled in the
// previous match arm. Other conditions must be upheld by the caller
old_size if old_layout.align() == new_layout.align() => unsafe {
let new_size = new_layout.size();

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