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mir-opt: support "FileCheck"-like annotations #85180
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A-mir-optArea: MIR optimizationsArea: MIR optimizationsA-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustcC-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.
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A-mir-optArea: MIR optimizationsArea: MIR optimizationsA-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustcC-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.
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Ever since our mir-opt tests were changed to auto-blessing, we no longer have a way to say "but this part of the output must definitely look like that". This makes tests a lot more fragile. We should re-add some infrastructure like that.
LLVM has FileCheck for this. We also had something like that for mir-opt tests that we could reinstate (I think it was adequate for this job, it just didn't work well for large chunks of code).
Cc @rust-lang/wg-mir-opt