Fix lifetimes elision suggestion in where clauses (#13752)

Fix #13749

changelog: [`needless_lifetimes`]: do not suggest using `'_` in `where`
clauses

Author: Manishearth

clippy_lints/src/lifetimes.rs

@@ -658,12 +658,6 @@ fn report_elidable_impl_lifetimes<'tcx>(
                     lifetime,
                     in_where_predicate: false,
                     ..
-                }
-                | Usage {
-                    lifetime,
-                    in_bounded_ty: false,
-                    in_generics_arg: false,
-                    ..
                 },
             ] = usages.as_slice()
             {

tests/ui/needless_lifetimes.fixed

@@ -562,4 +562,18 @@ mod rayon {
     }
 }
 
+mod issue13749 {
+    pub struct Generic<T>(T);
+    // Non elidable lifetime
+    #[expect(clippy::extra_unused_lifetimes)]
+    impl<'a, T> Generic<T> where T: 'a {}
+}
+
+mod issue13749bis {
+    pub struct Generic<T>(T);
+    // Non elidable lifetime
+    #[expect(clippy::extra_unused_lifetimes)]
+    impl<'a, T: 'a> Generic<T> {}
+}
+
 fn main() {}

tests/ui/needless_lifetimes.rs

@@ -562,4 +562,18 @@ mod rayon {
     }
 }
 
+mod issue13749 {
+    pub struct Generic<T>(T);
+    // Non elidable lifetime
+    #[expect(clippy::extra_unused_lifetimes)]
+    impl<'a, T> Generic<T> where T: 'a {}
+}
+
+mod issue13749bis {
+    pub struct Generic<T>(T);
+    // Non elidable lifetime
+    #[expect(clippy::extra_unused_lifetimes)]
+    impl<'a, T: 'a> Generic<T> {}
+}
+
 fn main() {}