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Rollup merge of rust-lang#98582 - oli-obk:unconstrained_opaque_type, …
…r=estebank Allow destructuring opaque types in their defining scopes fixes rust-lang#96572 Before this PR, the following code snippet failed with an incomprehensible error, and similar code just ICEd in mir borrowck. ```rust type T = impl Copy; let foo: T = (1u32, 2u32); let (a, b) = foo; ``` The problem was that the last line created MIR projections of the form `foo.0` and `foo.1`, but `foo`'s type is `T`, which doesn't have fields (only its hidden type does). But the pattern supplies enough type information (a tuple of two different inference types) to bind a hidden type.
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