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Fix typo in 3.8 Subtyping and Variance #395

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Mar 27, 2023
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Fix typo in 3.8 Subtyping and Variance #395

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2 changes: 1 addition & 1 deletion src/subtyping.md
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Expand Up @@ -335,7 +335,7 @@ we inherited invariance as soon as we put our reference inside an `&mut T`.

As it turns out, the argument for why it's ok for Box (and Vec, Hashmap, etc.) to
be covariant is pretty similar to the argument for why it's ok for
lifetimes to be covariant: as soon as you try to stuff them in something like a
references to be covariant: as soon as you try to stuff them in something like a
mutable reference, they inherit invariance and you're prevented from doing anything
bad.

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