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subtyping.md: typo fix

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c4rlo 2016-04-23 11:58:58 +01:00
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src/doc/nomicon/subtyping.md
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@ -53,7 +53,7 @@ inferred variance, so `Fn(T)` is invariant in `T`).
Some important variances:
* `&'a T` is variant over `'a` and `T` (as is `*const T` by metaphor)
* `&'a mut T` is variant with over `'a` but invariant over `T`
* `&'a mut T` is variant over `'a` but invariant over `T`
* `Fn(T) -> U` is invariant over `T`, but variant over `U`
* `Box`, `Vec`, and all other collections are variant over the types of
their contents