extra testing of how NLL handles wildcard type `_`#57729

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pnkfelix:issue-55748-pat-types-are-constraints-on-bindings-too

Mar 19, 2019

Commits on Mar 13, 2019

test that wildcard type `_` is not duplicated by `type Foo<X> = (X, X);` and potentially instantiated at different types.
pnkfelix
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