35a5541fd9
rustc_typeck: turn `where Type:,` into a WF(Type) predicate, instead of ignoring it. Fixes #53696, assuming crater doesn't catch anyone using this syntax already. Allowing an empty list of bounds in the grammar was done for the benefit of macro authors, most of which would *probably* be using it for bounds on type parameters, which are always WF. r? @nikomatsakis cc @petrochenkov
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