Don't allow duplicate definitions of structs and enum struct variants. #7267
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bors
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flip1995
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…shearth Some SpanlessHash improvements changelog: none * Use `mem::discriminant().hash()` instead of `stable_hash` for simple enums and then use `FxHasher` instead of `StableHasher`. We don't use any StableHash features. * Use `UnHashMap` for maps keyed by spanless hash values.
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Fixes #5792