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Suggest correct code when encountering an incorrect trait bound referencing the current trait #66042

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ohadravid
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Fixes #65985 and also improves the suggestion for code like this:

trait Grab {
    type Value;
    fn grab(&self) -> Grab::Value;
}

To suggest <Self as Grab>::Value.

I wasn't sure which of the syntax versions is better (<Self as ..>:: vs Self::), so I used the former simply because it was less change to the existing code.

r? @estebank

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Nov 2, 2019
@estebank
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estebank commented Nov 3, 2019

@bors r+ rollup

Love it!

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bors commented Nov 3, 2019

📌 Commit 8c90934 has been approved by estebank

@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 Nov 3, 2019
pietroalbini added a commit to pietroalbini/rust that referenced this pull request Nov 5, 2019
…-ref-current-trait, r=estebank

Suggest correct code when encountering an incorrect trait bound referencing the current trait

Fixes rust-lang#65985 and also improves the suggestion for code like this:

```
trait Grab {
    type Value;
    fn grab(&self) -> Grab::Value;
}
```

To suggest `<Self as Grab>::Value`.

I wasn't sure which of the syntax versions is better (`<Self as ..>::` vs `Self::`), so I used the former simply because it was less change to the existing code.

r? @estebank
bors added a commit that referenced this pull request Nov 5, 2019
Rollup of 10 pull requests

Successful merges:

 - #65136 (Update codegen option documentation.)
 - #65574 (docs: improve disclaimer regarding LinkedList)
 - #65720 (Add FFI bindings for LLVM's Module::getInstructionCount())
 - #65905 ([doc] fixes for unix/vxworks `OpenOptionsExt::mode`)
 - #65962 (Fix logic in example.)
 - #66019 (Improved std::iter::Chain documentation)
 - #66038 (doc(str): show example of chars().count() under len())
 - #66042 (Suggest correct code when encountering an incorrect trait bound referencing the current trait)
 - #66073 (Do not needlessly write-lock)
 - #66096 (Add a failing UI test for multiple loops of all kinds in a `const`)

Failed merges:

r? @ghost
@bors bors merged commit 8c90934 into rust-lang:master Nov 5, 2019
@ohadravid ohadravid deleted the suggest-correct-code-when-ref-current-trait branch November 14, 2019 15:54
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When encountering an incorrect trait bound referencing the current trait, suggest correct code
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