Refactor match checking to use HAIR#36695
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arielb1
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Is moving parts of HAIR to rustc_const_eval a good idea? What about doing the opposite?
That is, move match checking to rustc_mir and perhaps even integrate it with MIR match building.
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Another idea would be to move it to rustc_typeck (and maybe have HAIR definitions in rustc).
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match checking uses a completely different algorithm than match building. HAIR patterns are basically independent of the rest of HAIR.
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/build/src/librustc_const_eval/_match.rs:477: TODO is deprecated; use FIXME
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The TODO is the entire point of this PR. It will be removed before the merge.
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☔ The latest upstream changes (presumably #36857) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #36814) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #37002) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #37039) made this pull request unmergeable. Please resolve the merge conflicts. |
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`check_match` is now left with its grab bag of random checks.
no intended functional changes
NaN checking was a lint for a deprecated feature. It can go away.
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Convert byte literal pattern to byte array patterns when they are both used together. so matching them is properly handled. I could've done the conversion eagerly, but that could have caused a bad worst-case for massive byte-array matches. Fixes rust-lang#18027. Fixes rust-lang#25051. Fixes rust-lang#26510.
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nested slice patterns have the same functionality as non-nested ones, so flatten them in HAIR construction. Fixes rust-lang#26158.
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eddyb
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r=me with an explanation for the missing diagnostics, or a revert of their removal.
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| E0003: r##" | ||
| /*E0003: r##" |
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What's with these two commented diagnostics?
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E0002 was merged into E0004, and E0003 refers to a feature that does not exist anymore.
| [NAN, _] => {}, | ||
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| //~^^^ WARNING unmatchable NaN in pattern, use the is_nan method in a guard instead |
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Why are the NaN warnings gone?
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Because you can't have floating-point patterns anymore.
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@bors r=eddyb |
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📌 Commit 4157850 has been approved by |
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📌 Commit 3f9ebb4 has been approved by |
Refactor match checking to use HAIR Refactor match checking to use HAIR instead of HIR, fixing quite a few bugs in the process. r? @eddyb
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Refactor match checking to use HAIR instead of HIR, fixing quite a few bugs in the process.
r? @eddyb