Use RHS's struct def ID for error messages in pattern matching #14562
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Fix explicit deref problems in closure capture fix the `need-mut` part of rust-lang#14562 Perhaps surprisingly, it wasn't unique immutable borrow. The code still doesn't emit any of them, and I think those won't happen in edition 2021 (which is currently the only thing implemented), since we always capture `&mut *x` instead of `&mut x`. But I'm not very sure about it.
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Fixes #14541