diff options
3 files changed, 51 insertions, 1 deletions
diff --git a/compiler/rustc_hir_analysis/src/astconv/errors.rs b/compiler/rustc_hir_analysis/src/astconv/errors.rs index bd311c98fac..6082d446979 100644 --- a/compiler/rustc_hir_analysis/src/astconv/errors.rs +++ b/compiler/rustc_hir_analysis/src/astconv/errors.rs @@ -597,7 +597,21 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o { } } } - if !suggestions.is_empty() { + suggestions.sort_by_key(|&(span, _)| span); + // There are cases where one bound points to a span within another bound's span, like when + // you have code like the following (#115019), so we skip providing a suggestion in those + // cases to avoid having a malformed suggestion. + // + // pub struct Flatten<I> { + // inner: <IntoIterator<Item: IntoIterator<Item: >>::IntoIterator as Item>::core, + // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + // | ^^^^^^^^^^^^^^^^^^^^^ + // | | + // | associated types `Item`, `IntoIter` must be specified + // associated types `Item`, `IntoIter` must be specified + // } + let overlaps = suggestions.windows(2).any(|pair| pair[0].0.overlaps(pair[1].0)); + if !suggestions.is_empty() && !overlaps { err.multipart_suggestion( format!("specify the associated type{}", pluralize!(types_count)), suggestions, diff --git a/tests/ui/associated-type-bounds/overlaping-bound-suggestion.rs b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.rs new file mode 100644 index 00000000000..3853bc8594f --- /dev/null +++ b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.rs @@ -0,0 +1,12 @@ +#![allow(bare_trait_objects)] +#![feature(associated_type_bounds)] +trait Item { + type Core; +} +pub struct Flatten<I> { + inner: <IntoIterator<Item: IntoIterator<Item: >>::IntoIterator as Item>::Core, + //~^ ERROR E0191 + //~| ERROR E0223 +} + +fn main() {} diff --git a/tests/ui/associated-type-bounds/overlaping-bound-suggestion.stderr b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.stderr new file mode 100644 index 00000000000..61299550e98 --- /dev/null +++ b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.stderr @@ -0,0 +1,24 @@ +error[E0191]: the value of the associated types `IntoIter` (from trait `IntoIterator`), `IntoIter` (from trait `IntoIterator`), `Item` (from trait `IntoIterator`), `Item` (from trait `IntoIterator`) must be specified + --> $DIR/overlaping-bound-suggestion.rs:7:13 + | +LL | inner: <IntoIterator<Item: IntoIterator<Item: >>::IntoIterator as Item>::Core, + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | | | + | | associated types `Item`, `IntoIter` must be specified + | associated types `Item`, `IntoIter` must be specified + +error[E0223]: ambiguous associated type + --> $DIR/overlaping-bound-suggestion.rs:7:13 + | +LL | inner: <IntoIterator<Item: IntoIterator<Item: >>::IntoIterator as Item>::Core, + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: if there were a trait named `Example` with associated type `IntoIterator` implemented for `(dyn IntoIterator + 'static)`, you could use the fully-qualified path + | +LL | inner: <<(dyn IntoIterator + 'static) as Example>::IntoIterator as Item>::Core, + | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +error: aborting due to 2 previous errors + +Some errors have detailed explanations: E0191, E0223. +For more information about an error, try `rustc --explain E0191`. |