tests encoding current behavior for various cases of "binding" to _. #69573
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| let (_, _) = mm; | ||
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| fn match_moved_expr_to_wild() { |
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General note: Would be good to also test if let as it might diverge somewhat in the future in terms of MIR building.
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hmm. interesting the most obvious "ports" of these tests as written into if let form runs afoul of "warning: irrefutable if-let pattern"
Which makes total sense.
But also leads me to wonder whether I should be testing them in different fashion. I'm not sure these tests translate over to refutable patterns, because if the data has been moved away, then you won't have a discriminant to inspect.
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Perhaps just inserting an Option<_> layer would be good for the match/if-let tests? iirc I did that in a somewhat similar test somewhere. Presumably _ should work below sum types as well.
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r? @Centril r=me with comments ^-- addressed. |
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whoops! (wasn't able to test locally because I had to task switch to resolving a beta regression. I'll fix the tests.) |
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@pnkfelix any updates? |
The `_` binding form is special, in that it encodes a "no-op": nothing is actually bound, and thus nothing is moved or borrowed in this scenario. Usually we do the "right" thing in all such cases. The exceptions are explicitly pointed out in this test case, so that we keep track of whether they are eventually fixed.
Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>
Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>
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Decided to @bors r+ |
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…entril tests encoding current behavior for various cases of "binding" to _. The `_` binding form is special, in that it encodes a "no-op": nothing is actually bound, and thus nothing is moved or borrowed in this scenario. Usually we do the "right" thing in all such cases. The exceptions are explicitly pointed out in this test case, so that we keep track of whether they are eventually fixed. Cc rust-lang#53114. (This does not close the aforementioned issue; it just adds the tests encoding the current behavior, which we hope to eventually fix.)
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…entril tests encoding current behavior for various cases of "binding" to _. The `_` binding form is special, in that it encodes a "no-op": nothing is actually bound, and thus nothing is moved or borrowed in this scenario. Usually we do the "right" thing in all such cases. The exceptions are explicitly pointed out in this test case, so that we keep track of whether they are eventually fixed. Cc rust-lang#53114. (This does not close the aforementioned issue; it just adds the tests encoding the current behavior, which we hope to eventually fix.)
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Rollup of 5 pull requests Successful merges: - rust-lang#69573 (tests encoding current behavior for various cases of "binding" to _.) - rust-lang#70881 (bootstrap: work around "unused attribute" errors in incremental stdlib rebuilds.) - rust-lang#70957 (Normalize MIR locals' types for generator layout computation.) - rust-lang#70962 (added machine hooks to track deallocations) - rust-lang#70982 (Normalize function signature in function casting check procedure) Failed merges: r? @ghost
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The
_binding form is special, in that it encodes a "no-op": nothing is actually bound, and thus nothing is moved or borrowed in this scenario. Usually we do the "right" thing in all such cases. The exceptions are explicitly pointed out in this test case, so that we keep track of whether they are eventually fixed.Cc #53114.
(This does not close the aforementioned issue; it just adds the tests encoding the current behavior, which we hope to eventually fix.)