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c864953c0f
fix: Don't show type mismatches for `{unknown}` to non-`{unknown}` mismatches
Fixes https://github.com/rust-lang/rust-analyzer/issues/15704
Basically we zip the two types, inspecting their substitutions if the constructors are the same, if we encounter a zip step with an `{unknown}` on one side and a non-`{unknown}` on the other we error out and discard the diagnostic. Otherwise we keep it.