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Fix typo/minor grammar error in subtyping.md #317

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Oct 7, 2021
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Fix typo/minor grammar error in subtyping.md #317

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2 changes: 1 addition & 1 deletion src/subtyping.md
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Expand Up @@ -418,7 +418,7 @@ And that's why function types, unlike anything else in the language, are
**contra**variant over their arguments.

Now, this is all well and good for the types the standard library provides, but
how is variance determined for type that *you* define? A struct, informally
how is variance determined for types that *you* define? A struct, informally
speaking, inherits the variance of its fields. If a struct `MyType`
has a generic argument `A` that is used in a field `a`, then MyType's variance
over `A` is exactly `a`'s variance over `A`.
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