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Mir: Trans Switch #29574

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@nikomatsakis

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@nikomatsakis

The Switch terminator, which is used in pattern matching, is currently unimplemented in MIR. This terminator should load the discriminant from an lvalue and branch to the appropriate basic block target based on what is found there. It has to integrate with the adt code.

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    A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlE-mentorCall for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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