fixup! Support trait bounds with type parameters.

Author: Allen Hsu

clippy_lints/src/trait_bounds.rs

@@ -8,8 +8,8 @@ use rustc_data_structures::unhash::UnhashMap;
 use rustc_errors::Applicability;
 use rustc_hir::def::Res;
 use rustc_hir::{
-    GenericArg, GenericBound, GenericBound, Generics, Item, ItemKind, Node, ParamName, Path, PathSegment, QPath,
-    TraitItem, Ty, TyKind, WherePredicate,
+    GenericArg, GenericBound, Generics, Item, ItemKind, Node, Path, PathSegment, QPath, TraitItem, Ty, TyKind,
+    WherePredicate,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
@@ -95,7 +95,7 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "1.62.0"]
     pub REPEATED_WHERE_CLAUSE_OR_TRAIT_BOUND,
-    pedantic,
+    nursery,
     "Traits are repeated within trait bounds or where clause"
 }
 
@@ -282,27 +282,25 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
 }
 
 #[derive(PartialEq, Eq, Hash, Debug)]
-struct ComparableBound(Res, Vec<Res>, Vec<ComparableBound>);
+struct ComparableBound(
+    Res,
+    Vec<Res>,
+    // Vec<ComparableBound>
+);
 
 fn check_bounds_or_where_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
     if gen.span.from_expansion() {
         return;
     }
 
-    for param in gen.params {
-        if let ParamName::Plain(_) = param.name {
-            // other alternatives are errors and elided which won't have duplicates
-            rollup_traits(cx, param.bounds, "this trait bound contains repeated elements");
-        }
-    }
-
-    for predicate in gen.where_clause.predicates {
+    for predicate in gen.predicates {
         if let WherePredicate::BoundPredicate(ref bound_predicate) = predicate {
-            rollup_traits(
-                cx,
-                bound_predicate.bounds,
-                "this where clause contains repeated elements",
-            );
+            let msg = if predicate.in_where_clause() {
+                "these where clauses contain repeated elements"
+            } else {
+                "these bounds contain repeated elements"
+            };
+            rollup_traits(cx, bound_predicate.bounds, msg);
         }
     }
 }
@@ -336,10 +334,10 @@ fn try_into_comparable_bound(bound: &GenericBound<'_>) -> Option<ComparableBound
                 })
                 .flatten()
                 .collect(),
-            t.bound_generic_params
-                .iter()
-                .flat_map(|param| param.bounds.iter().filter_map(try_into_comparable_bound))
-                .collect(),
+            // t.bound_generic_params
+            //     .iter()
+            //     .flat_map(|param| param.bounds.iter().filter_map(try_into_comparable_bound))
+            //     .collect(),
         ))
     } else {
         None

tests/ui/repeated_where_clause_or_trait_bound.stderr

@@ -1,4 +1,4 @@
-error: this trait bound contains repeated elements
+error: these bounds contain repeated elements
   --> $DIR/repeated_where_clause_or_trait_bound.rs:6:15
    |
 LL | fn bad_foo<T: Clone + Clone + Clone + Copy, U: Clone + Copy>(arg0: T, argo1: U) {
@@ -10,31 +10,31 @@ note: the lint level is defined here
 LL | #![deny(clippy::repeated_where_clause_or_trait_bound)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: this where clause contains repeated elements
+error: these where clauses contain repeated elements
   --> $DIR/repeated_where_clause_or_trait_bound.rs:12:8
    |
 LL |     T: Clone + Clone + Clone + Copy,
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Clone + Copy`
 
-error: this where clause contains repeated elements
+error: these where clauses contain repeated elements
   --> $DIR/repeated_where_clause_or_trait_bound.rs:47:15
    |
 LL |         Self: Clone + Clone + Clone;
    |               ^^^^^^^^^^^^^^^^^^^^^ help: try: `Clone`
 
-error: this trait bound contains repeated elements
+error: these bounds contain repeated elements
   --> $DIR/repeated_where_clause_or_trait_bound.rs:61:24
    |
 LL | trait BadTraitBound<T: Clone + Clone + Clone + Copy, U: Clone + Copy> {
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Clone + Copy`
 
-error: this where clause contains repeated elements
+error: these where clauses contain repeated elements
   --> $DIR/repeated_where_clause_or_trait_bound.rs:68:12
    |
 LL |         T: Clone + Clone + Clone + Copy,
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Clone + Copy`
 
-error: this trait bound contains repeated elements
+error: these bounds contain repeated elements
   --> $DIR/repeated_where_clause_or_trait_bound.rs:101:19
    |
 LL | fn bad_generic<T: GenericTrait<u64> + GenericTrait<u32> + GenericTrait<u64>>(arg0: T) {