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Add label to method chains where assoc type remains the same

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This commit is contained in:
Esteban Küber 2022-12-07 12:25:49 -08:00
parent c77ad2d765
commit aff0ab43c8
2 changed files with 10 additions and 5 deletions
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5
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -3027,6 +3027,11 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
span,
format!("`{assoc}` changed to `{ty}` here"),
));
} else {
span_labels.push((
span,
format!("`{assoc}` remains `{ty}` here"),
));
}
}
(Some((span, (assoc, ty))), None) => {

10
src/test/ui/iterators/invalid-iterator-chain.stderr
View File

@ -58,9 +58,9 @@ LL | .map(|x| x as f64)
LL | .map(|x| x as i64)
| ^^^^^^^^^^^^^^^^^ `std::iter::Iterator::Item` changed to `i64` here
LL | .filter(|x| *x > 0)
| ------------------
| ------------------ `std::iter::Iterator::Item` remains `i64` here
LL | .map(|x| { x + 1 })
| ------------------
| ------------------ `std::iter::Iterator::Item` remains `i64` here
LL | .map(|x| { x; })
| ^^^^^^^^^^^^^^^ `std::iter::Iterator::Item` changed to `()` here
note: required by a bound in `std::iter::Iterator::sum`
@ -136,16 +136,16 @@ LL | let a = vec![0];
LL | let b = a.into_iter();
| ^^^^^^^^^^^ `std::iter::Iterator::Item` is `{integer}` here
LL | let c = b.map(|x| x + 1);
| --------------
| -------------- `std::iter::Iterator::Item` remains `{integer}` here
LL | let d = c.filter(|x| *x > 10 );
| --------------------
| -------------------- `std::iter::Iterator::Item` remains `{integer}` here
LL | let e = d.map(|x| {
| _______________^
LL | | x + 1;
LL | | });
| |______^ `std::iter::Iterator::Item` changed to `()` here
LL | let f = e.filter(|_| false);
| -----------------
| ----------------- `std::iter::Iterator::Item` remains `()` here
note: required by a bound in `collect`
--> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
|