44d6d86ccb
Tweak output of missing lifetime on associated type Each commit can be reviewed independently. Address parts of #135589. --- When an associated type is missing a lifetime, point at its enclosing `impl`, whether it has or doesn't have lifetimes defined. If it does have a lifetime, suggest using it. ``` error: in the trait associated type is declared without lifetime parameters, so using a borrowed type for them requires that lifetime to come from the implemented type --> $DIR/missing-lifetime-in-assoc-type-1.rs:8:17 | LL | impl<'a> IntoIterator for &S { | ---- there is a named lifetime specified on the impl block you could use ... LL | type Item = &T; | ^ this lifetime must come from the implemented type | help: consider using the lifetime from the impl block | LL | type Item = &'a T; | ++ ``` ``` error: in the trait associated type is declared without lifetime parameters, so using a borrowed type for them requires that lifetime to come from the implemented type --> $DIR/missing-lifetime-in-assoc-type-2.rs:5:17 | LL | impl IntoIterator for &S { | - you could add a lifetime on the impl block, if the trait or the self type can have one LL | type Item = &T; | ^ this lifetime must come from the implemented type ``` --- On unconstrained lifetime on impl block, suggest using it if there's an implicit borrow in the self type ``` error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates --> $DIR/missing-lifetime-in-assoc-type-1.rs:4:6 | LL | impl<'a> IntoIterator for &S { | ^^ unconstrained lifetime parameter | help: consider using the named lifetime here instead of an implict lifetime | LL | impl<'a> IntoIterator for &'a S { | ++ ``` --- Do not suggest introducing lifetime in impl assoc type --- Previously we only showed the trait's assoc item if the trait was local, because we were looking for a small span only for the generics, which we don't have for foreign traits. We now use `def_span` for the item, so we at least provide some context, even if its span is too wide. ``` error[E0195]: lifetime parameters or bounds on type `IntoIter` do not match the trait declaration --> tests/ui/lifetimes/missing-lifetime-in-assoc-type-4.rs:7:18 | 7 | type IntoIter<'a> = std::collections::btree_map::Values<'a, i32, T>; | ^^^^ lifetimes do not match type in trait | ::: /home/gh-estebank/rust/library/core/src/iter/traits/collect.rs:292:5 | 292 | type IntoIter: Iterator<Item = Self::Item>; | ------------------------------------------ lifetimes in impl do not match this type in trait ``` |
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