[clang] [Clang] Implement resolution for CWG1835 (PR #92957)

[Krystian Stasiowski via cfe-commits]

================
@@ -55,15 +55,21 @@ namespace PR11856 {
 
   template<typename T> T *end(T*);
 
-  class X { };
+  struct X { };
+  struct Y {
+    int end;
+  };
   template <typename T>
   void Foo2() {
     T it1;
-    if (it1->end < it1->end) {
-    }
+    if (it1->end < it1->end) { }
 
     X *x;
-    if (x->end < 7) {  // expected-error{{no member named 'end' in 'PR11856::X'}}
-    }
+    if (x->end < 7) { } // expected-error{{expected '>'}}
+                        // expected-note at -1{{to match this '<'}}
+                        // expected-error at -2{{expected unqualified-id}}
----------------
sdkrystian wrote:

This actually is expected -- see the final note in the comments of the PR. Since we didn't find anything via qualified lookup, we "lock into" the nested-name-specifier interpretation (because it would otherwise be an invalid class member access since such a member doesn't exist). So, we do unqualified lookup, find the template, and try parse `<` as a template argument list. 

https://github.com/llvm/llvm-project/pull/92957