Cleanup and refactor FnCtxt::report_no_match_method_error #148652

rperier · 2025-11-07T14:58:09Z

As discussed on zulip with @lcnr, this is a proposal for refactorizing this method.

See #t-compiler/help > (PR #144674) Merge multiple suggestions into a single @ 💬

rustbot · 2025-11-07T14:58:14Z

rustbot has assigned @wesleywiser.
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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rperier · 2025-11-07T14:58:41Z

r? @lcnr

lcnr · 2025-11-07T16:38:06Z

For changes which move a bunch of code around it's really helpful to split it into individual commits, e.g. if you have "move things into a whatever_its_called sub-fn" this is a lot nicer to review as a separate commit. Think this is fine for now, but please do so in future PRs

compiler/rustc_hir_typeck/src/method/suggest.rs

lcnr · 2025-11-07T16:46:10Z

compiler/rustc_hir_typeck/src/method/suggest.rs

+    ) {
+        let mut find_candidate_for_method = false;

        if should_label_not_found && !custom_span_label {


do this in the caller and only have a single bool argument?

compiler/rustc_hir_typeck/src/method/suggest.rs

lcnr · 2025-11-07T16:54:55Z

compiler/rustc_hir_typeck/src/method/suggest.rs

+        let mut restrict_type_params = false;
+        let mut suggested_derive = false;
+        let mut unsatisfied_bounds = false;


these 3 bools are very ☠️ would be nice to look into how to make them unnecessary or somehow unify their intended impact

mhhhh Some of theses errors are mutually exclusive : restrict_type_params and suggested_derive. So an enum perhaps... what do you think ?

This enum might be returned by the function suggest_unsatisfied_ty_or_trait

so I think there's "what's the current behavior" and "what should it be". As in, should these errors be exclusive or would it be fine to simplify the control flow here.

I think if you want to keep this as a purely structural change, having 3 bools isn#t the worst thing in the world.

Idk how I feel about an enum, it might be slightly cleaner, but my issue is mainly that we have this mangled controlflow in the first place :>

compiler/rustc_hir_typeck/src/method/suggest.rs

rperier · 2025-11-19T16:41:18Z

I have splitted the changes into severals commits, it will be easier to review. I have included most of the requested changes already.

rperier · 2025-11-19T16:46:15Z

The conversations I kept opened are still unclear to me, but at least we can discuss on a sound basis (and reviewable)

compiler/rustc_hir_typeck/src/method/suggest.rs

…od_error Currently this method is quiet long and complex, this commit refactors it and improves its readability by adding sub-fn

…thod_error Currently this method is quiet long and complex, this commit refactors it and improves its readability by adding sub-fn

…hod_error Currently this method is quiet long and complex, this commit refactors it and improves its readability by adding sub-fn

…d_error Currently this method is quiet long and complex, this commit refactors it and improves its readability by adding sub-fn

…o_match_method_error Currently this method is quiet long and complex, this commit refactors it and improves its readability by adding sub-fn

…t_no_match_method_error Currently this method is quiet long and complex, this commit refactors it and improves its readability by adding sub-fn

…eport_no_match_method_error Currently this method is quiet long and complex, this commit refactors it and improves its readability by adding sub-fn

Currently this method is quiet long and complex, this commit improves its readability, refactor and cleanup few things

rustbot · 2025-11-22T18:46:01Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

lcnr · 2025-11-24T18:49:47Z

@bors r+ rollup

bors · 2025-11-24T18:49:50Z

📌 Commit 4c952eb has been approved by lcnr

It is now in the queue for this repository.

…or-refactoring, r=lcnr Cleanup and refactor FnCtxt::report_no_match_method_error As discussed on zulip with `@lcnr,` this is a proposal for refactorizing this method. See [#t-compiler/help > (PR rust-lang#144674) Merge multiple suggestions into a single @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.28PR.20.23144674.29.20Merge.20multiple.20suggestions.20into.20a.20single/near/539991695)

Rollup of 3 pull requests Successful merges: - #148652 (Cleanup and refactor FnCtxt::report_no_match_method_error) - #149200 (Add test for derive helper compat collisions) - #149274 (Fix invalid link generation for type alias methods) r? `@ghost` `@rustbot` modify labels: rollup

…or-refactoring, r=lcnr Cleanup and refactor FnCtxt::report_no_match_method_error As discussed on zulip with ``@lcnr,`` this is a proposal for refactorizing this method. See [#t-compiler/help > (PR rust-lang#144674) Merge multiple suggestions into a single @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.28PR.20.23144674.29.20Merge.20multiple.20suggestions.20into.20a.20single/near/539991695)

Rollup of 3 pull requests Successful merges: - #148652 (Cleanup and refactor FnCtxt::report_no_match_method_error) - #149268 (add implementation-internal namespace for globalasm) - #149274 (Fix invalid link generation for type alias methods) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 8 pull requests Successful merges: - #147736 (Stabilize `asm_cfg`) - #148652 (Cleanup and refactor FnCtxt::report_no_match_method_error) - #149167 (skip checking supertraits in object candidate for `NormalizesTo` goal) - #149210 (fix: Do not ICE on normalization failure of an extern static item) - #149268 (add implementation-internal namespace for globalasm) - #149274 (Fix invalid link generation for type alias methods) - #149302 (Fix comment wording in simplify_comparison_integral.rs) - #149305 (Simplify OnceCell Clone impl) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #148652 - rperier:report_no_match_method_error-refactoring, r=lcnr Cleanup and refactor FnCtxt::report_no_match_method_error As discussed on zulip with ```@lcnr,``` this is a proposal for refactorizing this method. See [#t-compiler/help > (PR #144674) Merge multiple suggestions into a single @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.28PR.20.23144674.29.20Merge.20multiple.20suggestions.20into.20a.20single/near/539991695)

Rollup of 8 pull requests Successful merges: - rust-lang/rust#147736 (Stabilize `asm_cfg`) - rust-lang/rust#148652 (Cleanup and refactor FnCtxt::report_no_match_method_error) - rust-lang/rust#149167 (skip checking supertraits in object candidate for `NormalizesTo` goal) - rust-lang/rust#149210 (fix: Do not ICE on normalization failure of an extern static item) - rust-lang/rust#149268 (add implementation-internal namespace for globalasm) - rust-lang/rust#149274 (Fix invalid link generation for type alias methods) - rust-lang/rust#149302 (Fix comment wording in simplify_comparison_integral.rs) - rust-lang/rust#149305 (Simplify OnceCell Clone impl) r? `@ghost` `@rustbot` modify labels: rollup

rustbot assigned wesleywiser Nov 7, 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 Nov 7, 2025

rustbot assigned lcnr and unassigned wesleywiser Nov 7, 2025

rperier force-pushed the report_no_match_method_error-refactoring branch from 9a8910e to 177bb33 Compare November 7, 2025 15:25

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lcnr changed the title ~~Cleanup and refactorize FnCtxt::report_no_match_method_error~~ Cleanup and refactor FnCtxt::report_no_match_method_error Nov 7, 2025

lcnr reviewed Nov 7, 2025

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