A clone-like function in a function that takes as an argument the type
that it returns.
However, functions that return a type variable are not counted as
clone-line. Because we're not unifying the whole function at once,
a function like `U -> T` would otherwise be counted as "clone-like"
because the generics will just unify with anything when done seperatly.
Co-authored-by: Michael Howell <michael@notriddle.com>
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