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Suggest returning local on "expected ty, found ()" due to expr-less block #98784

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merged 1 commit into from
Jul 20, 2022

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Putting this up for initial review. Notably, this doesn't consider if the value has possibly been moved, or whether the type is Copy. It also provides a structured suggestion if there's one "preferred" binding that matches the type (i.e. one binding in the block or its parent), otherwise it just points them out if there's fewer than 4 of them.

Fixes #98177

r? @estebank

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jul 1, 2022
@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 1, 2022
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Comment on lines +887 to +891
err.span_suggestion_verbose(
span_semi,
"consider removing this semicolon and boxing the expression",
"",
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preexisting: This stands out to me. I guess we didn't have the statement span without the semicolon to suggest Box::new( before?

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I will fix that -- we should be able to strip the semicolon and provide a full suggestion (MaybeIncorrect, still) to box it

@compiler-errors compiler-errors force-pushed the forgot-to-return-binding branch from 5bd41c5 to a697665 Compare July 1, 2022 22:46
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@rustbot author

@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 8, 2022
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bors commented Jul 9, 2022

☔ The latest upstream changes (presumably #99078) made this pull request unmergeable. Please resolve the merge conflicts.

bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 10, 2022
…k-compatible, r=estebank

Do not call `check_expr` in `check_compatible`, since it has side-effects

Fixes a weird suggestion in rust-lang#98784

found later:
Fixes rust-lang#98894
Fixes rust-lang#98897
@compiler-errors compiler-errors force-pushed the forgot-to-return-binding branch from a697665 to bc64fb0 Compare July 19, 2022 03:00
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@rustbot ready

this is ready for another round of review i think, fixed the whitespace issue

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 19, 2022
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r=me

@compiler-errors compiler-errors force-pushed the forgot-to-return-binding branch from bc64fb0 to b0a8190 Compare July 20, 2022 03:58
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@bors r=estebank

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bors commented Jul 20, 2022

📌 Commit b0a8190 has been approved by estebank

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 20, 2022
bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 20, 2022
Rollup of 5 pull requests

Successful merges:

 - rust-lang#98784 (Suggest returning local on "expected `ty`, found `()`" due to expr-less block)
 - rust-lang#98916 (Windows: Use `FindFirstFileW` for getting the metadata of locked system files)
 - rust-lang#99433 (Erase regions before comparing signatures of foreign fns.)
 - rust-lang#99452 (int_macros was only using to_xe_bytes_doc and not from_xe_bytes_doc)
 - rust-lang#99481 (Add regression test for rust-lang#71547)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 97c9f16 into rust-lang:master Jul 20, 2022
@rustbot rustbot added this to the 1.64.0 milestone Jul 20, 2022
@compiler-errors compiler-errors deleted the forgot-to-return-binding branch August 11, 2023 20:01
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On functions with return type and no returned value, point at appropriate bindings to be returned
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