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a2c99cf87c
Use structured suggestions for unconstrained generic parameters on impl blocks I did not deduplicate with `UnusedGenericParameter`, because in contrast to type declarations, just using a generic parameter in an impl isn't enough, it must be used with the right variance and not just as part of a projection.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.