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Rollup merge of #27525 - Gankro:nomvar, r=aturon

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I thought this was actually a huge error and I'd have to rewrite a bunch but
it looks like everything else was correct.

Closes #27457

r? @aturon
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Manish Goregaokar 2015-08-05 13:45:38 +05:30
commit a497c6722e
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4
src/doc/nomicon/subtyping.md
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@ -93,8 +93,8 @@ fn main() {
The signature of `overwrite` is clearly valid: it takes mutable references to
two values of the same type, and overwrites one with the other. If `&mut T` was
variant over T, then `&mut &'a str` would be a subtype of `&mut &'static str`,
since `&'a str` is a subtype of `&'static str`. Therefore the lifetime of
variant over T, then `&mut &'static str` would be a subtype of `&mut &'a str`,
since `&'static str` is a subtype of `&'a str`. Therefore the lifetime of
`forever_str` would successfully be "shrunk" down to the shorter lifetime of
`string`, and `overwrite` would be called successfully. `string` would
subsequently be dropped, and `forever_str` would point to freed memory when we