�ャの型推論と注釈</a></h3>
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Closures don’t require you to annotate the types of the parameters or the
return value like `fn` functions do. Type annotations are required on functions
because they’re part of an explicit interface exposed to your users. Defining
this interface rigidly is important for ensuring that everyone agrees on what
types of values a function uses and returns. But closures aren’t used in an
exposed interface like this: they’re stored in variables and used without
nami