Index: clang/lib/Sema/SemaCXXScopeSpec.cpp
===================================================================
--- clang/lib/Sema/SemaCXXScopeSpec.cpp
+++ clang/lib/Sema/SemaCXXScopeSpec.cpp
@@ -828,10 +828,14 @@
   }
 
   if (!Found.empty()) {
-    if (TypeDecl *TD = Found.getAsSingle<TypeDecl>())
+    if (TypeDecl *TD = Found.getAsSingle<TypeDecl>()) {
       Diag(IdInfo.IdentifierLoc, diag::err_expected_class_or_namespace)
           << Context.getTypeDeclType(TD) << getLangOpts().CPlusPlus;
-    else {
+    } else if (TemplateDecl *TD = Found.getAsSingle<TemplateDecl>()) {
+      ParsedType SuggestedType;
+      DiagnoseUnknownTypeName(IdInfo.Identifier, IdInfo.IdentifierLoc, S, &SS,
+                              SuggestedType);
+    } else {
       Diag(IdInfo.IdentifierLoc, diag::err_expected_class_or_namespace)
           << IdInfo.Identifier << getLangOpts().CPlusPlus;
       if (NamedDecl *ND = Found.getAsSingle<NamedDecl>())
Index: clang/test/SemaCXX/nested-name-spec.cpp
===================================================================
--- clang/test/SemaCXX/nested-name-spec.cpp
+++ clang/test/SemaCXX/nested-name-spec.cpp
@@ -473,3 +473,10 @@
     x: goto x;
   }
 }
+
+template <typename T>
+struct x; // expected-note {{template is declared here}}
+
+template <typename T>
+int issue55962 = x::a; // expected-error {{use of class template 'x' requires template arguments}} \
+                       // expected-warning {{variable templates are a C++14 extension}}