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Auto merge of rust-lang#13264 - lowr:patch/no-dyn-without-trait, r=Ve…
…ykril Ensure at least one trait bound in `TyKind::DynTy` One would expect `TyKind::DynTy` to have at least one trait bound, but we may produce a dyn type with no trait bounds at all. This patch prevents it by returning `TyKind::Error` in such cases. An "empty" dyn type would have caused panic during method resolution without rust-lang#13257. Although already fixed, I think an invariant to never produce such types would help prevent similar problems in the future.
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