hir_typeck: be more conservative in making "note caller chooses ty param" note #126558
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| debug!("return type (hir::Ty) {:?}", hir_ty); | ||
| let ty = self.lowerer().lower_ty(hir_ty); | ||
| debug!("return type {:?}", ty); | ||
| debug!("return type (ty) {:?}", ty); | ||
| debug!("expected type {:?}", expected); |
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Btw, tracing has a nice shorthand for this but it doesn't matter. For future reference:
debug!(?hir_ty, "return type");
let ty = self.lowerer().lower_ty(hir_ty);
debug!(?ty, "return type");
debug!(ty = ?expected, "expected type");which will print:
return type hir_ty=...
return type ty=...
expected type ty=...
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(I actually did know that shorthand, I just copied over what existed lol)
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... but now that you mentioned it, it's indeed nicer so I changed it ^^
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hir_typeck: be more conservative in making "note caller chooses ty param" note In rust-lang#122195 I added a "caller chooses ty for type param" note for when the return expression type a.k.a. found type does not match the expected return type. rust-lang#126547 found that this note was confusing when the found return type *contains* the expected type, e.g. ```rs fn f<T>(t: &T) -> T { t } ``` because the found return type `&T` will *always* be different from the expected return type `T`, so the note was needlessly redundant and confusing. This PR addresses that by not making the note if the found return type contains the expected return type. r? `@fmease` (since you reviewed the original PR) Fixes rust-lang#126547
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☔ The latest upstream changes (presumably #126623) made this pull request unmergeable. Please resolve the merge conflicts. |
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…ram" note - Avoid "caller chooses ty for type param" note if the found type a.k.a. the return expression type *contains* the type parameter, because e.g. `&T` will always be different from `T` (i.e. "well duh"). - Rename `note_caller_chooses_ty_for_ty_param` to `try_note_caller_chooses_ty_for_ty_param` because the note is not always made. Issue: rust-lang#126547
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…llaumeGomez Rollup of 9 pull requests Successful merges: - rust-lang#123782 (Test that opaque types can't have themselves as a hidden type with incompatible lifetimes) - rust-lang#124580 (Suggest removing unused tuple fields if they are the last fields) - rust-lang#125852 (improve tip for inaccessible traits) - rust-lang#126422 (Suggest using a standalone doctest for non-local impl defs) - rust-lang#126427 (Rewrite `intrinsic-unreachable`, `sepcomp-cci-copies`, `sepcomp-inlining` and `sepcomp-separate` `run-make` tests to rmake.rs) - rust-lang#126493 (safe transmute: support non-ZST, variantful, uninhabited enums) - rust-lang#126572 (override user defined channel when using precompiled rustc) - rust-lang#126615 (Add `rustc-ice*` to `.gitignore`) - rust-lang#126632 (Replace `move||` with `move ||`) Failed merges: - rust-lang#126558 (hir_typeck: be more conservative in making "note caller chooses ty param" note) r? `@ghost` `@rustbot` modify labels: rollup
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hir_typeck: be more conservative in making "note caller chooses ty param" note In rust-lang#122195 I added a "caller chooses ty for type param" note for when the return expression type a.k.a. found type does not match the expected return type. rust-lang#126547 found that this note was confusing when the found return type *contains* the expected type, e.g. ```rs fn f<T>(t: &T) -> T { t } ``` because the found return type `&T` will *always* be different from the expected return type `T`, so the note was needlessly redundant and confusing. This PR addresses that by not making the note if the found return type contains the expected return type. r? `@fmease` (since you reviewed the original PR) Fixes rust-lang#126547
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Rollup of 10 pull requests Successful merges: - rust-lang#124135 (delegation: Implement glob delegation) - rust-lang#125078 (fix: break inside async closure has incorrect span for enclosing closure) - rust-lang#125293 (Place tail expression behind terminating scope) - rust-lang#126422 (Suggest using a standalone doctest for non-local impl defs) - rust-lang#126493 (safe transmute: support non-ZST, variantful, uninhabited enums) - rust-lang#126504 (Sync fuchsia test runner with clang test runner) - rust-lang#126558 (hir_typeck: be more conservative in making "note caller chooses ty param" note) - rust-lang#126586 (Add `@badboy` and `@BlackHoleFox` as Mac Catalyst maintainers) - rust-lang#126615 (Add `rustc-ice*` to `.gitignore`) - rust-lang#126632 (Replace `move||` with `move ||`) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#126558 - jieyouxu:caller-chooses-ty, r=fmease hir_typeck: be more conservative in making "note caller chooses ty param" note In rust-lang#122195 I added a "caller chooses ty for type param" note for when the return expression type a.k.a. found type does not match the expected return type. rust-lang#126547 found that this note was confusing when the found return type *contains* the expected type, e.g. ```rs fn f<T>(t: &T) -> T { t } ``` because the found return type `&T` will *always* be different from the expected return type `T`, so the note was needlessly redundant and confusing. This PR addresses that by not making the note if the found return type contains the expected return type. r? ``@fmease`` (since you reviewed the original PR) Fixes rust-lang#126547
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In #122195 I added a "caller chooses ty for type param" note for when the return expression type a.k.a. found type does not match the expected return type.
#126547 found that this note was confusing when the found return type contains the expected type, e.g.
because the found return type
&Twill always be different from the expected return typeT, so the note was needlessly redundant and confusing.This PR addresses that by not making the note if the found return type contains the expected return type.
r? @fmease (since you reviewed the original PR)
Fixes #126547