For E0223, suggest associated functions that are similar to the path, even if the base type has multiple inherent impl blocks. by zachs18 · Pull Request #135865 · rust-lang/rust

zachs18 · 2025-01-22T06:44:13Z

Currently, the "help: there is an associated function with a similar name from_utf8" suggestion for String::from::utf8 is only given if String has exactly one inherent impl item. This PR makes the suggestion be emitted even if the base type has multiple inherent impl items.

Example:

struct Foo;
impl Foo {
    fn bar_baz() {}
}
impl Foo {} // load-bearing
fn main() {
    Foo::bar::baz;
}

Nightly/stable output:

error[E0223]: ambiguous associated type
 --> f.rs:7:5
  |
7 |     Foo::bar::baz;
  |     ^^^^^^^^
  |
help: if there were a trait named `Example` with associated type `bar` implemented for `Foo`, you could use the fully-qualified path
  |
7 |     <Foo as Example>::bar::baz;
  |     ~~~~~~~~~~~~~~~~~~~~~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0223`.

Output with this PR, or without the load-bearing empty impl on nightly/stable:

error[E0223]: ambiguous associated type
 --> f.rs:7:5
  |
7 |     Foo::bar::baz;
  |     ^^^^^^^^
  |
help: there is an associated function with a similar name: `bar_baz`
  |
7 |     Foo::bar_baz;
  |          ~~~~~~~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0223`.

Ideally, this suggestion would also work for non-ADT types like ~~str::char::indices~~ (edit: latest commit makes this work with primitives) or <dyn Any>::downcast::mut_unchecked, but that seemed to be a harder change.

@rustbot label +A-diagnostics

rustbot · 2025-01-22T06:44:22Z

r? @compiler-errors

rustbot has assigned @compiler-errors.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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rustbot · 2025-01-22T06:44:24Z

HIR ty lowering was modified

cc @fmease

zachs18 · 2025-01-22T08:04:45Z

(Latest commit also works for primitives, but not <dyn Any>::downcast::mut_unchecked)

… even if there are multiple inherent impls to check.

compiler-errors

r=me with or without nit

compiler-errors · 2025-01-23T18:21:12Z

tests/ui/suggestions/issue-109195.stderr

@@ -1,5 +1,5 @@
 error[E0223]: ambiguous associated type
-  --> $DIR/issue-109195.rs:2:5
+  --> $DIR/issue-109195.rs:12:5


Want to give this test a better name as a drive-by improvement?

compiler-errors · 2025-01-23T18:21:34Z

@bors delegate+

bors · 2025-01-23T18:21:38Z

✌️ @zachs18, you can now approve this pull request!

If @compiler-errors told you to "r=me" after making some further change, please make that change, then do @bors r=@compiler-errors

zachs18 · 2025-01-23T19:23:26Z

@bors r=@compiler-errors

bors · 2025-01-23T19:23:28Z

📌 Commit 2c58212 has been approved by compiler-errors

It is now in the queue for this repository.

…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#133605 (Add extensive set of drop order tests) - rust-lang#135489 (remove pointless allowed_through_unstable_modules on TryFromSliceError) - rust-lang#135757 (Add NuttX support for AArch64 and ARMv7-A targets) - rust-lang#135799 (rustdoc-json: Rename `Path::name` to `path`, and give it the path again.) - rust-lang#135865 (For E0223, suggest associated functions that are similar to the path, even if the base type has multiple inherent impl blocks.) - rust-lang#135890 (Implement `VecDeque::pop_front_if` & `VecDeque::pop_back_if`) - rust-lang#135914 (Remove usages of `QueryNormalizer` in the compiler) - rust-lang#135936 (fix reify-intrinsic test) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#135865 - zachs18:maybe_report_similar_assoc_fn_more, r=compiler-errors For E0223, suggest associated functions that are similar to the path, even if the base type has multiple inherent impl blocks. Currently, the "help: there is an associated function with a similar name `from_utf8`" suggestion for `String::from::utf8` is only given if `String` has exactly one inherent `impl` item. This PR makes the suggestion be emitted even if the base type has multiple inherent `impl` items. Example: ```rust struct Foo; impl Foo { fn bar_baz() {} } impl Foo {} // load-bearing fn main() { Foo::bar::baz; } ``` Nightly/stable output: ```rust error[E0223]: ambiguous associated type --> f.rs:7:5 | 7 | Foo::bar::baz; | ^^^^^^^^ | help: if there were a trait named `Example` with associated type `bar` implemented for `Foo`, you could use the fully-qualified path | 7 | <Foo as Example>::bar::baz; | ~~~~~~~~~~~~~~~~~~~~~ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0223`. ``` Output with this PR, or without the load-bearing empty impl on nightly/stable: ```rust error[E0223]: ambiguous associated type --> f.rs:7:5 | 7 | Foo::bar::baz; | ^^^^^^^^ | help: there is an associated function with a similar name: `bar_baz` | 7 | Foo::bar_baz; | ~~~~~~~ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0223`. ``` Ideally, this suggestion would also work for non-ADT types like ~~`str::char::indices`~~ (edit: latest commit makes this work with primitives) or `<dyn Any>::downcast::mut_unchecked`, but that seemed to be a harder change. `@rustbot` label +A-diagnostics

…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#133605 (Add extensive set of drop order tests) - rust-lang#135489 (remove pointless allowed_through_unstable_modules on TryFromSliceError) - rust-lang#135757 (Add NuttX support for AArch64 and ARMv7-A targets) - rust-lang#135799 (rustdoc-json: Rename `Path::name` to `path`, and give it the path again.) - rust-lang#135865 (For E0223, suggest associated functions that are similar to the path, even if the base type has multiple inherent impl blocks.) - rust-lang#135890 (Implement `VecDeque::pop_front_if` & `VecDeque::pop_back_if`) - rust-lang#135914 (Remove usages of `QueryNormalizer` in the compiler) - rust-lang#135936 (fix reify-intrinsic test) r? `@ghost` `@rustbot` modify labels: rollup

rustbot assigned compiler-errors Jan 22, 2025

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 22, 2025

rustbot added the A-diagnostics Area: Messages for errors, warnings, and lints label Jan 22, 2025

zachs18 mentioned this pull request Jan 22, 2025

[WIP] Add support for custom allocator for String #101551

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zachs18 added 3 commits January 22, 2025 02:13

For E0223, suggest associated functions that are similar to the path,…

6702df1

… even if there are multiple inherent impls to check.

Add test that multiple impls works with E0223 similar-name suggestion.

221b621

Also check for associated fns on primitives in E0223 similar-path check.

7e1a8bd

zachs18 force-pushed the maybe_report_similar_assoc_fn_more branch from 9f23011 to 7e1a8bd Compare January 22, 2025 08:13

compiler-errors approved these changes Jan 23, 2025

View reviewed changes

Give E0223 similar-item suggestion test more descriptive name.

2c58212

rustbot added A-tidy Area: The tidy tool T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Jan 23, 2025

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 23, 2025

matthiaskrgr mentioned this pull request Jan 24, 2025

Rollup of 8 pull requests #135978

Merged

bors merged commit efb8084 into rust-lang:master Jan 24, 2025
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rustbot added this to the 1.86.0 milestone Jan 24, 2025

zachs18 deleted the maybe_report_similar_assoc_fn_more branch November 10, 2025 17:44

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For E0223, suggest associated functions that are similar to the path, even if the base type has multiple inherent impl blocks.#135865

For E0223, suggest associated functions that are similar to the path, even if the base type has multiple inherent impl blocks.#135865
bors merged 4 commits intorust-lang:masterfrom
zachs18:maybe_report_similar_assoc_fn_more

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