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Improve fn pointer notes#107287

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bors merged 1 commit intorust-lang:masterfrom
mattjperez:improve-fn-pointer-notes
Jan 26, 2023
Merged

Improve fn pointer notes#107287
bors merged 1 commit intorust-lang:masterfrom
mattjperez:improve-fn-pointer-notes

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@mattjperez mattjperez commented Jan 25, 2023

continuation of #105552

r? @compiler-errors

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rustbot commented Jan 25, 2023

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @compiler-errors (or someone else) soon.

Please see the contribution instructions for more information.

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 25, 2023
@mattjperez mattjperez force-pushed the improve-fn-pointer-notes branch 3 times, most recently from 1371c1c to 78c2035 Compare January 25, 2023 17:05
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rustbot commented Jan 25, 2023

Some changes occurred in src/tools/cargo

cc @ehuss

@mattjperez mattjperez force-pushed the improve-fn-pointer-notes branch from 78c2035 to 80d9aea Compare January 25, 2023 17:11
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mattjperez commented Jan 25, 2023

rebased onto master and ready for review

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eggyal suggested changes Jan 26, 2023
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Just the one suggestion from me; otherwise looks good!

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compiler/rustc_infer/src/infer/error_reporting/suggest.rs Outdated
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Suggested change
"consider casting the expected and found fn items to fn pointers, i.e. `{}` and the following suggestion",
"consider casting both fn items to fn pointers using `as ....`",

(fill in the .... with just the signature they need to be casted to)

And then perhaps using https://doc.rust-lang.org/nightly/nightly-rustc/rustc_errors/diagnostic/struct.Diagnostic.html#method.span_suggestion_hidden

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Let me explain my thinking here: the phrasing "expected and found fn items" is a bit verbose, and "and the following suggestion" is a bit awkward. Let's avoid both by just explaining the gist of what the user needs to do.

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@mattjperez mattjperez Jan 26, 2023 •
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Yeah, that explanation is much nicer to read. --verbose is my default and it has been much harder than expected to be concise.

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I've applied the suggestions.

@mattjperez mattjperez force-pushed the improve-fn-pointer-notes branch 2 times, most recently from 0a71c1d to 6baec2c Compare January 26, 2023 03:29
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Thanks for following up on this, and for applying the suggestions.

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compiler-errors commented Jan 26, 2023

@bors r+ rollup

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bors commented Jan 26, 2023

📌 Commit 6baec2c91668ae53a7631f10a911b4a1837710cf has been approved by compiler-errors

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 Jan 26, 2023
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compiler-errors commented Jan 26, 2023

Sorry for the back and forth, just one tiny nit I totally overlooked

@bors r-

@bors bors 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jan 26, 2023
@mattjperez
improve fn pointer notes
3016f55 
- add note and suggestion for casting both expected and found fn items
  to fn pointers
- add note for casting expected fn item to fn pointer
@mattjperez mattjperez force-pushed the improve-fn-pointer-notes branch from 6baec2c to 3016f55 Compare January 26, 2023 05:07
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compiler-errors commented Jan 26, 2023

ty

@bors r+

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bors commented Jan 26, 2023

📌 Commit 3016f55 has been approved by compiler-errors

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jan 26, 2023
@matthiaskrgr matthiaskrgr mentioned this pull request Jan 26, 2023
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 26, 2023
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Auto merge of rust-lang#107318 - matthiaskrgr:rollup-776kd81, r=matth…
40fda7b 
…iaskrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#97373 (impl DispatchFromDyn for Cell and UnsafeCell)
 - rust-lang#106625 (Remove backwards compat for LLVM 12 coverage format)
 - rust-lang#106779 (Avoid __cxa_thread_atexit_impl on Emscripten)
 - rust-lang#106811 (Append .dwp to the binary filename instead of replacing the existing extension.)
 - rust-lang#106836 (Remove optimistic spinning from `mpsc::SyncSender`)
 - rust-lang#106946 (implement Hash for proc_macro::LineColumn)
 - rust-lang#107074 (remove unnecessary check for opaque types)
 - rust-lang#107287 (Improve fn pointer notes)
 - rust-lang#107304 (Use `can_eq` to compare types for default assoc type error)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit f2f1234 into rust-lang:master Jan 26, 2023
@rustbot rustbot added this to the 1.69.0 milestone Jan 26, 2023
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@compiler-errors compiler-errors compiler-errors approved these changes

@eggyal eggyal eggyal approved these changes

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