return &mut T from the arenas, not &T #18407
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The arenas write the value to memory and then return a non-aliasing reference to it. The returned reference can be mutable and can be coerced to an immutable one. [breaking-change]
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This seems fine to me, just want another set of eyes to confirm. r? @pcwalton (you wrote TypedArena, right?) |
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…etup-tips Fix formatting on welcome page, read only paths setting example
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The arenas write the value to memory and then return a non-aliasing
reference to it. The returned reference can be mutable and can be
coerced to an immutable one.
[breaking-change]