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This commit is contained in:
John Kelly 2023-05-09 10:06:38 +01:00
parent 5c8a00923b
commit b169bdb732
1 changed files with 10 additions and 5 deletions
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15
clippy_lints/src/trait_bounds.rs
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@ -174,8 +174,13 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
if let TyKind::TraitObject(bounds, ..) = mut_ty.ty.kind;
if bounds.len() > 2;
then {
// Build up a hash of every trait we've seen
// When we see a trait for the first time, add it to unique_traits
// so we can later use it to build a string of all traits exactly once, without duplicates
let mut seen_def_ids = FxHashSet::default();
let mut fixed_traits = Vec::new();
let mut unique_traits = Vec::new();
// Iterate the bounds and add them to our seen hash
// If we haven't yet seen it, add it to the fixed traits
@ -185,20 +190,20 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
let new_trait = seen_def_ids.insert(def_id);
if new_trait {
fixed_traits.push(bound);
unique_traits.push(bound);
}
}
// If the number added to fixed (which are not duplicates) isn't the same as the number found,
// If the number of unique traits isn't the same as the number of traits in the bounds,
// there must be 1 or more duplicates
if bounds.len() != fixed_traits.len() {
if bounds.len() != unique_traits.len() {
let mut bounds_span = bounds[0].span;
for bound in bounds.iter().skip(1) {
bounds_span = bounds_span.to(bound.span);
}
let fixed_trait_snippet = fixed_traits
let fixed_trait_snippet = unique_traits
.iter()
.filter_map(|b| snippet_opt(cx, b.span))
.collect::<Vec<_>>()