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diagnostics: use rustc_on_unimplemented to recommend [].iter()#94746

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diagnostics: use rustc_on_unimplemented to recommend [].iter()#94746
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@notriddle notriddle commented Mar 8, 2022

To make this work, the #[rustc_on_unimplemented] data needs to be used to
report method resolution errors, which is most of what this commit does.

Fixes #94581

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Mar 8, 2022
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r? @davidtwco

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@notriddle notriddle force-pushed the notriddle/method-rustc-on-unimplemented branch from 98d9d80 to f8dd9d8 Compare March 8, 2022 19:35
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@notriddle notriddle force-pushed the notriddle/method-rustc-on-unimplemented branch from f8dd9d8 to 81e9fad Compare March 8, 2022 19:47
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This looks good to me - diagnostics are much improved.

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davidtwco commented Mar 9, 2022

@bors r+

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bors commented Mar 9, 2022

📌 Commit 81e9fad has been approved by davidtwco

@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 Mar 9, 2022
Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Mar 9, 2022
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Rollup merge of rust-lang#94746 - notriddle:notriddle/method-rustc-on…
ef6136e 
…-unimplemented, r=davidtwco

diagnostics: use rustc_on_unimplemented to recommend `[].iter()`

To make this work, the `#[rustc_on_unimplemented]` data needs to be used to
report method resolution errors, which is most of what this commit does.

Fixes rust-lang#94581
@Dylan-DPC Dylan-DPC mentioned this pull request Mar 9, 2022
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bors commented Mar 9, 2022

⌛ Testing commit 81e9fad with merge 98b46a5f9d617746a362517cb83438c64faf213b...

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Dylan-DPC commented Mar 9, 2022

@bors r- retry
failed in rollup

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Mar 9, 2022
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Dylan-DPC commented Mar 9, 2022

@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 Mar 9, 2022
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diagnostics: use rustc_on_unimplemented to recommend [].iter()
32d7f81 
To make this work, the `#[rustc_on_unimplemented]` data needs to be used to
report method resolution errors, which is most of what this commit does.

Fixes rust-lang#94581
@notriddle notriddle force-pushed the notriddle/method-rustc-on-unimplemented branch from 81e9fad to 32d7f81 Compare March 9, 2022 16:55
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notriddle commented Mar 9, 2022

@Dylan-DPC

Okay, the change I pushed should restore the old error message ordering, by making sure all the extra annotations are pushed to the DiagnosticBuilder after the primary error span. This should ensure that the primary file always goes first, instead of sometimes going first and non-deterministically swapping the primary file with some other file.

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davidtwco commented Mar 10, 2022

@bors r+

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bors commented Mar 10, 2022

📌 Commit 32d7f81 has been approved by davidtwco

@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 Mar 10, 2022
@matthiaskrgr matthiaskrgr mentioned this pull request Mar 10, 2022
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Auto merge of rust-lang#94802 - matthiaskrgr:rollup-4plu0fi, r=matthi…
ba14a83 
…askrgr

Rollup of 5 pull requests

Successful merges:

 - rust-lang#92150 (Improve suggestion when casting usize to (possibly) wide pointer)
 - rust-lang#94635 (Merge `#[deprecated]` and `#[rustc_deprecated]`)
 - rust-lang#94657 (Constify `Index{,Mut}` for `[T]`, `str`, and `[T; N]`)
 - rust-lang#94746 (diagnostics: use rustc_on_unimplemented to recommend `[].iter()`)
 - rust-lang#94788 (Account for suggestions for complete removal of lines)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit e7281d0 into rust-lang:master Mar 10, 2022
@rustbot rustbot added this to the 1.61.0 milestone Mar 10, 2022
@notriddle notriddle deleted the notriddle/method-rustc-on-unimplemented branch March 10, 2022 15:26
notriddle added a commit to notriddle/rust that referenced this pull request Mar 11, 2022
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diagnostics: do not spurriously claim something is "not an iterator"
317f684 
Fixes a minor regression caused by rust-lang#94746, where iter::Filter is
spurriously declared "not an iterator."
@notriddle notriddle mentioned this pull request Mar 11, 2022
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bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 12, 2022
@bors
Auto merge of rust-lang#94870 - notriddle:notriddle/filter-regression…
2582566 
…, r=oli-obk

diagnostics: do not spurriously claim something is "not an iterator"

Fixes a minor regression caused by rust-lang#94746, where `iter::Filter` is spurriously declared "not an iterator."
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Better error message when forgetting iter() on slices

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