[clang] [Clang][ASTMatcher] Add a matcher for the name of a DependentScopeDeclRefExpr (PR #121656)

[Nathan Ridge via cfe-commits]

================
@@ -2235,6 +2235,24 @@ TEST_P(ASTMatchersTest, ArgumentCountIs_CXXConstructExpr) {
                  Constructor1Arg));
 }
 
+TEST_P(ASTMatchersTest, HasDependentName_DependentScopeDeclRefExpr) {
+  if (!GetParam().isCXX() || GetParam().hasDelayedTemplateParsing()) {
+    // FIXME: Fix this test to work with delayed template parsing.
+    return;
+  }
+
+  EXPECT_TRUE(matches("template <class T> class X : T { void f() { T::v; } };",
+                      dependentScopeDeclRefExpr(hasDependentName("v"))));
+
+  EXPECT_TRUE(matches("template <typename T> struct S { static T Foo; };"
+                      "template <typename T> void x() { (void)S<T>::Foo; }",
+                      dependentScopeDeclRefExpr(hasDependentName("Foo"))));
+
+  EXPECT_TRUE(matches("template <typename T> struct S { static T foo(); };"
+                      "template <typename T> void x() { S<T>::foo; }",
----------------
HighCommander4 wrote:

nit: it would make the example more realistic if the function is actually called, as in `S<T>::foo();`

https://github.com/llvm/llvm-project/pull/121656