Take generic args into account for bounded type

clippy_lints/src/utils/hir_utils.rs

@@ -703,6 +703,7 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
                     }
                     for segment in path.segments {
                         segment.ident.name.hash(&mut self.s);
+                        self.hash_generic_args(segment.generic_args().args);
                     }
                 },
                 QPath::TypeRelative(ref ty, ref segment) => {
@@ -711,13 +712,7 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
                 },
             },
             TyKind::OpaqueDef(_, arg_list) => {
-                for arg in *arg_list {
-                    match arg {
-                        GenericArg::Lifetime(ref l) => self.hash_lifetime(l),
-                        GenericArg::Type(ref ty) => self.hash_ty(&ty),
-                        GenericArg::Const(ref ca) => self.hash_body(ca.value.body),
-                    }
-                }
+                self.hash_generic_args(arg_list);
             },
             TyKind::TraitObject(_, lifetime) => {
                 self.hash_lifetime(lifetime);
@@ -735,4 +730,14 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
         self.hash_expr(&self.cx.tcx.hir().body(body_id).value);
         self.maybe_typeck_tables = old_maybe_typeck_tables;
     }
+
+    fn hash_generic_args(&mut self, arg_list: &[GenericArg<'_>]) {
+        for arg in arg_list {
+            match arg {
+                GenericArg::Lifetime(ref l) => self.hash_lifetime(l),
+                GenericArg::Type(ref ty) => self.hash_ty(&ty),
+                GenericArg::Const(ref ca) => self.hash_body(ca.value.body),
+            }
+        }
+    }
 }

tests/ui/type_repetition_in_bounds.rs

@@ -18,6 +18,7 @@ where
     unimplemented!();
 }
 
+// Threshold test (see #4380)
 trait LintBounds
 where
     Self: Clone,
@@ -35,4 +36,18 @@ where
 {
 }
 
+// Generic distinction (see #4323)
+pub struct Foo<A>(A);
+pub struct Bar<A, B> {
+    a: Foo<A>,
+    b: Foo<B>,
+}
+
+impl<A, B> Unpin for Bar<A, B>
+where
+    Foo<A>: Unpin,
+    Foo<B>: Unpin,
+{
+}
+
 fn main() {}

tests/ui/type_repetition_in_bounds.stderr

@@ -12,7 +12,7 @@ LL | #![deny(clippy::type_repetition_in_bounds)]
    = help: consider combining the bounds: `T: Copy + Clone`
 
 error: this type has already been used as a bound predicate
-  --> $DIR/type_repetition_in_bounds.rs:24:5
+  --> $DIR/type_repetition_in_bounds.rs:25:5
    |
 LL |     Self: Copy + Default + Ord,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^