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Auto merge of #8315 - dswij:8306, r=giraffate

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`trait_duplication_in_bounds` checks path segments for trait items

closes #8306

changelog: [`trait_duplication_in_bounds`] Fix FP when path segments exists for trait items
This commit is contained in:
bors 2022-01-24 00:03:40 +00:00
commit 60d3597cd2
3 changed files with 68 additions and 36 deletions
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58
clippy_lints/src/trait_bounds.rs
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@ -3,7 +3,7 @@ use clippy_utils::source::{snippet, snippet_with_applicability};
use clippy_utils::{SpanlessEq, SpanlessHash};
use core::hash::{Hash, Hasher};
use if_chain::if_chain;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::unhash::UnhashMap;
use rustc_errors::Applicability;
use rustc_hir::def::Res;
@ -91,7 +91,7 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'tcx>) {
let Generics { where_clause, .. } = &item.generics;
let mut self_bounds_set = FxHashSet::default();
let mut self_bounds_map = FxHashMap::default();
for predicate in where_clause.predicates {
if_chain! {
@ -108,27 +108,29 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
)
) = cx.tcx.hir().get_if_local(*def_id);
then {
if self_bounds_set.is_empty() {
if self_bounds_map.is_empty() {
for bound in self_bounds.iter() {
let Some((self_res, _)) = get_trait_res_span_from_bound(bound) else { continue };
self_bounds_set.insert(self_res);
let Some((self_res, self_segments, _)) = get_trait_info_from_bound(bound) else { continue };
self_bounds_map.insert(self_res, self_segments);
}
}
bound_predicate
.bounds
.iter()
.filter_map(get_trait_res_span_from_bound)
.for_each(|(trait_item_res, span)| {
if self_bounds_set.get(&trait_item_res).is_some() {
span_lint_and_help(
cx,
TRAIT_DUPLICATION_IN_BOUNDS,
span,
"this trait bound is already specified in trait declaration",
None,
"consider removing this trait bound",
);
.filter_map(get_trait_info_from_bound)
.for_each(|(trait_item_res, trait_item_segments, span)| {
if let Some(self_segments) = self_bounds_map.get(&trait_item_res) {
if SpanlessEq::new(cx).eq_path_segments(self_segments, trait_item_segments) {
span_lint_and_help(
cx,
TRAIT_DUPLICATION_IN_BOUNDS,
span,
"this trait bound is already specified in trait declaration",
None,
"consider removing this trait bound",
);
}
}
});
}
@ -137,14 +139,6 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
}
}
fn get_trait_res_span_from_bound(bound: &GenericBound<'_>) -> Option<(Res, Span)> {
if let GenericBound::Trait(t, _) = bound {
Some((t.trait_ref.path.res, t.span))
} else {
None
}
}
impl TraitBounds {
fn check_type_repetition<'tcx>(self, cx: &LateContext<'tcx>, gen: &'tcx Generics<'_>) {
struct SpanlessTy<'cx, 'tcx> {
@ -231,7 +225,7 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
let res = param
.bounds
.iter()
.filter_map(get_trait_res_span_from_bound)
.filter_map(get_trait_info_from_bound)
.collect::<Vec<_>>();
map.insert(*ident, res);
}
@ -245,10 +239,10 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
if let Some(segment) = segments.first();
if let Some(trait_resolutions_direct) = map.get(&segment.ident);
then {
for (res_where, _) in bound_predicate.bounds.iter().filter_map(get_trait_res_span_from_bound) {
if let Some((_, span_direct)) = trait_resolutions_direct
for (res_where, _, _) in bound_predicate.bounds.iter().filter_map(get_trait_info_from_bound) {
if let Some((_, _, span_direct)) = trait_resolutions_direct
.iter()
.find(|(res_direct, _)| *res_direct == res_where) {
.find(|(res_direct, _, _)| *res_direct == res_where) {
span_lint_and_help(
cx,
TRAIT_DUPLICATION_IN_BOUNDS,
@ -263,3 +257,11 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
}
}
}
fn get_trait_info_from_bound<'a>(bound: &'a GenericBound<'_>) -> Option<(Res, &'a [PathSegment<'a>], Span)> {
if let GenericBound::Trait(t, _) = bound {
Some((t.trait_ref.path.res, t.trait_ref.path.segments, t.span))
} else {
None
}
}