Fix printing of templated records. (#86339)

Fixed the printing of templated argument list and added test case.

Author: zahiraam

clang/lib/AST/TypePrinter.cpp

@@ -2322,11 +2322,6 @@ printTo(raw_ostream &OS, ArrayRef<TA> Args, const PrintingPolicy &Policy,
     } else {
       if (!FirstArg)
         OS << Comma;
-      if (!Policy.SuppressTagKeyword &&
-          Argument.getKind() == TemplateArgument::Type &&
-          isa<TagType>(Argument.getAsType()))
-        OS << Argument.getAsType().getAsString();
-      else
         // Tries to print the argument with location info if exists.
         printArgument(Arg, Policy, ArgOS,
                       TemplateParameterList::shouldIncludeTypeForArgument(

clang/unittests/AST/DeclPrinterTest.cpp

@@ -1386,6 +1386,75 @@ TEST(DeclPrinter, TestTemplateArgumentList16) {
   ASSERT_TRUE(PrintedDeclCXX11Matches(Code, "NT2", "int NT2 = 5"));
 }
 
+TEST(DeclPrinter, TestCXXRecordDecl17) {
+  ASSERT_TRUE(PrintedDeclCXX98Matches("template<typename T> struct Z {};"
+                                      "struct X {};"
+                                      "Z<X> A;",
+                                      "A", "Z<X> A"));
+  [](PrintingPolicy &Policy) { Policy.SuppressTagKeyword = false; };
+}
+
+TEST(DeclPrinter, TestCXXRecordDecl18) {
+  ASSERT_TRUE(PrintedDeclCXX98Matches("template<typename T> struct Z {};"
+                                      "struct X {};"
+                                      "Z<X> A;"
+                                      "template <typename T1, int>"
+                                      "struct Y{};"
+                                      "Y<Z<X>, 2> B;",
+                                      "B", "Y<Z<X>, 2> B"));
+  [](PrintingPolicy &Policy) { Policy.SuppressTagKeyword = false; };
+}
+
+TEST(DeclPrinter, TestCXXRecordDecl19) {
+  ASSERT_TRUE(PrintedDeclCXX98Matches("template<typename T> struct Z {};"
+                                      "struct X {};"
+                                      "Z<X> A;"
+                                      "template <typename T1, int>"
+                                      "struct Y{};"
+                                      "Y<Z<X>, 2> B;",
+                                      "B", "Y<Z<X>, 2> B"));
+  [](PrintingPolicy &Policy) { Policy.SuppressTagKeyword = true; };
+}
+TEST(DeclPrinter, TestCXXRecordDecl20) {
+  ASSERT_TRUE(PrintedDeclCXX98Matches(
+      "template <typename T, int N> class Inner;"
+      "template <typename T, int N>"
+      "class Inner{Inner(T val){}};"
+      "template <class InnerClass, int N> class Outer {"
+      "public:"
+      "struct NestedStruct {"
+      "int nestedValue;"
+      "NestedStruct(int val) : nestedValue(val) {}"
+      "};"
+      "InnerClass innerInstance;"
+      "Outer(const InnerClass &inner) : innerInstance(inner) {}"
+      "};"
+      "Outer<Inner<int, 10>, 5>::NestedStruct nestedInstance(100);",
+      "nestedInstance",
+      "Outer<Inner<int, 10>, 5>::NestedStruct nestedInstance(100)"));
+  [](PrintingPolicy &Policy) { Policy.SuppressTagKeyword = false; };
+}
+
+TEST(DeclPrinter, TestCXXRecordDecl21) {
+  ASSERT_TRUE(PrintedDeclCXX98Matches(
+      "template <typename T, int N> class Inner;"
+      "template <typename T, int N>"
+      "class Inner{Inner(T val){}};"
+      "template <class InnerClass, int N> class Outer {"
+      "public:"
+      "struct NestedStruct {"
+      "int nestedValue;"
+      "NestedStruct(int val) : nestedValue(val) {}"
+      "};"
+      "InnerClass innerInstance;"
+      "Outer(const InnerClass &inner) : innerInstance(inner) {}"
+      "};"
+      "Outer<Inner<int, 10>, 5>::NestedStruct nestedInstance(100);",
+      "nestedInstance",
+      "Outer<Inner<int, 10>, 5>::NestedStruct nestedInstance(100)"));
+  [](PrintingPolicy &Policy) { Policy.SuppressTagKeyword = true; };
+}
+
 TEST(DeclPrinter, TestFunctionParamUglified) {
   llvm::StringLiteral Code = R"cpp(
     class __c;