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f162d11351
interpret: fix overlapping aggregate initialization This fixes the problem pointed out by ````@saethlin```` in https://github.com/rust-lang/rust/issues/146383#issuecomment-3273224645. Also clarify when exactly current de-facto MIR semantics allow overlap of the LHS and RHS in an assignment.
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.