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Perform OpaqueCast field projection on HIR, too. fixes #105819 This is necessary for closure captures in 2021 edition, as they capture individual fields, not the full mentioned variables. So it may try to capture a field of an opaque (because the hidden type is known to be something with a field). See https://github.com/rust-lang/rust/pull/99806 for when and why we added OpaqueCast to MIR.