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May 26, 2025
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Use consistent type parameters in subtyping.md #493

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2 changes: 1 addition & 1 deletion src/subtyping.md
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Expand Up @@ -139,7 +139,7 @@ If we remember from the above examples,
it was ok for us to treat `&'a T` as a subtype of `&'b T` if `'a <: 'b`,
therefore we can say that `&'a T` is *covariant* over `'a`.

Also, we saw that it was not ok for us to treat `&mut &'a U` as a subtype of `&mut &'b U`,
Also, we saw that it was not ok for us to treat `&mut &'a T` as a subtype of `&mut &'b T`,
therefore we can say that `&mut T` is *invariant* over `T`

Here is a table of some other generic types and their variances:
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