Index: llvm/lib/Demangle/DLangDemangle.cpp
===================================================================
--- llvm/lib/Demangle/DLangDemangle.cpp
+++ llvm/lib/Demangle/DLangDemangle.cpp
@@ -199,6 +199,15 @@
 
   size_t N = 0;
   do {
+    // Skip over anonymous symbols.
+    if (*Mangled == '0') {
+      do
+        ++Mangled;
+      while (*Mangled == '0');
+
+      continue;
+    }
+
     if (N++)
       *Demangled << '.';
 
Index: llvm/unittests/Demangle/DLangDemangleTest.cpp
===================================================================
--- llvm/unittests/Demangle/DLangDemangleTest.cpp
+++ llvm/unittests/Demangle/DLangDemangleTest.cpp
@@ -34,4 +34,7 @@
         std::make_pair("_D88", nullptr),
         std::make_pair("_D8demangleZ", "demangle"),
         std::make_pair("_D8demangle4testZ", "demangle.test"),
-        std::make_pair("_D8demangle4test5test2Z", "demangle.test.test2")));
+        std::make_pair("_D8demangle4test5test2Z", "demangle.test.test2"),
+        std::make_pair("_D8demangle9anonymous0Z", "demangle.anonymous"),
+        std::make_pair("_D8demangle9anonymous03fooZ",
+                       "demangle.anonymous.foo")));