1 files changed, 10 insertions, 3 deletions
diff --git a/clang/lib/AST/MicrosoftMangle.cpp b/clang/lib/AST/MicrosoftMangle.cpp
index 348f05d3682..6f1a1f4fed6 100644
--- a/clang/lib/AST/MicrosoftMangle.cpp
+++ b/clang/lib/AST/MicrosoftMangle.cpp
@@ -1384,9 +1384,16 @@ void MicrosoftCXXNameMangler::mangleTemplateArgs(
   assert(TPL->size() == TemplateArgs.size() &&
          "size mismatch between args and parms!");
 
-  unsigned Idx = 0;
-  for (const TemplateArgument &TA : TemplateArgs.asArray())
-    mangleTemplateArg(TD, TA, TPL->getParam(Idx++));
+  for (size_t i = 0; i < TemplateArgs.size(); ++i) {
+    const TemplateArgument &TA = TemplateArgs[i];
+
+    // Separate consecutive packs by $$Z.
+    if (i > 0 && TA.getKind() == TemplateArgument::Pack &&
+        TemplateArgs[i - 1].getKind() == TemplateArgument::Pack)
+      Out << "$$Z";
+
+    mangleTemplateArg(TD, TA, TPL->getParam(i));
+  }
 }
 
 void MicrosoftCXXNameMangler::mangleTemplateArg(const TemplateDecl *TD,