fixup! [clang][AST] Pretty-print default template template args

Author: bolshakov-a

clang/docs/ReleaseNotes.rst

@@ -124,7 +124,9 @@ AST Dumping Potentially Breaking Changes
     ``__atomic_test_and_set(p, 0)``
 
 - Pretty-printing of templates with inherited (i.e. specified in a previous
-  redeclaration) and template default arguments has been fixed.
+  redeclaration) default arguments has been fixed.
+
+- Default arguments of template template parameters are pretty-printed now.
 
 Clang Frontend Potentially Breaking Changes
 -------------------------------------------

clang/lib/AST/DeclPrinter.cpp

@@ -111,6 +111,7 @@ namespace {
     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
     void VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *TTP);
     void VisitNonTypeTemplateParmDecl(const NonTypeTemplateParmDecl *NTTP);
+    void VisitTemplateTemplateParmDecl(const TemplateTemplateParmDecl *);
     void VisitHLSLBufferDecl(HLSLBufferDecl *D);
 
     void VisitOpenACCDeclareDecl(OpenACCDeclareDecl *D);
@@ -1189,12 +1190,7 @@ void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params,
     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
       VisitNonTypeTemplateParmDecl(NTTP);
     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
-      VisitTemplateDecl(TTPD);
-      if (TTPD->hasDefaultArgument() && !TTPD->defaultArgumentWasInherited()) {
-        Out << " = ";
-        TTPD->getDefaultArgument().getArgument().print(Policy, Out,
-                                                       /*IncludeType=*/false);
-      }
+      VisitTemplateTemplateParmDecl(TTPD);
     }
   }
 
@@ -1920,6 +1916,16 @@ void DeclPrinter::VisitNonTypeTemplateParmDecl(
   }
 }
 
+void DeclPrinter::VisitTemplateTemplateParmDecl(
+    const TemplateTemplateParmDecl *TTPD) {
+  VisitTemplateDecl(TTPD);
+  if (TTPD->hasDefaultArgument() && !TTPD->defaultArgumentWasInherited()) {
+    Out << " = ";
+    TTPD->getDefaultArgument().getArgument().print(Policy, Out,
+                                                   /*IncludeType=*/false);
+  }
+}
+
 void DeclPrinter::VisitOpenACCDeclareDecl(OpenACCDeclareDecl *D) {
   if (!D->isInvalidDecl()) {
     Out << "#pragma acc declare";