P0091R3: Improved syntactic checking of deduction-guides.

llvm-svn: 294395
diff --git a/clang/lib/AST/DeclarationName.cpp b/clang/lib/AST/DeclarationName.cpp
index 5f09b27..6053bd7 100644
--- a/clang/lib/AST/DeclarationName.cpp
+++ b/clang/lib/AST/DeclarationName.cpp
@@ -203,7 +203,10 @@
   }
 
   case DeclarationName::CXXDeductionGuideName:
-    return getCXXDeductionGuideTemplate()->getDeclName().print(OS, Policy);
+    OS << "<deduction guide for ";
+    getCXXDeductionGuideTemplate()->getDeclName().print(OS, Policy);
+    OS << '>';
+    return;
 
   case DeclarationName::CXXOperatorName: {
     static const char* const OperatorNames[NUM_OVERLOADED_OPERATORS] = {