Diagnose attempts to write a templated data member, from Stepan

Dyatkovskiy! Fixes PR10896.

llvm-svn: 140250

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -1947,6 +1947,9 @@ def err_template_template_parm_no_parms : Error<
 def err_template_variable : Error<"variable %0 declared as a template">;
 def err_template_variable_noparams : Error<
   "extraneous 'template<>' in declaration of variable %0">;
+def err_template_member : Error<"member %0 declared as a template">;
+def err_template_member_noparams : Error<
+  "extraneous 'template<>' in declaration of member %0">;
 def err_template_tag_noparams : Error<
   "extraneous 'template<>' in declaration of %0 %1">;
 def err_template_decl_ref : Error<

clang/lib/Sema/SemaDeclCXX.cpp

@@ -1121,6 +1121,30 @@ Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
   if (isInstField) {
     CXXScopeSpec &SS = D.getCXXScopeSpec();
     
+    // FIXME: Check that the name is an identifier!
+    IdentifierInfo *II = Name.getAsIdentifierInfo();
+
+    // Member field could not be with "template" keyword.
+    // So TemplateParameterLists should be empty in this case.
+    if (TemplateParameterLists.size()) {
+      TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0];
+      if (TemplateParams->size()) {
+        // There is no such thing as a member field template.
+        Diag(D.getIdentifierLoc(), diag::err_template_member)
+            << II
+            << SourceRange(TemplateParams->getTemplateLoc(),
+                TemplateParams->getRAngleLoc());
+      } else {
+        // There is an extraneous 'template<>' for this member.
+        Diag(TemplateParams->getTemplateLoc(),
+            diag::err_template_member_noparams)
+            << II
+            << SourceRange(TemplateParams->getTemplateLoc(),
+                TemplateParams->getRAngleLoc());
+      }
+      return 0;
+    }
+
     if (SS.isSet() && !SS.isInvalid()) {
       // The user provided a superfluous scope specifier inside a class
       // definition:
@@ -1138,9 +1162,7 @@ Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
        
       SS.clear();
     }
-    
-    // FIXME: Check for template parameters!
-    // FIXME: Check that the name is an identifier!
+
     Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
                          HasDeferredInit, AS);
     assert(Member && "HandleField never returns null");

clang/test/SemaTemplate/nested-template.cpp

@@ -125,4 +125,20 @@ X2<int>::Inner<X2_arg> x2i1;
 X2<float> x2a; // expected-note{{instantiation}}
 X2<long>::Inner<X2_arg> x2i3; // expected-error{{template template argument has different}}
 
+namespace PR10896 {
+  template<typename TN>
+  class Foo {
 
+  public:
+    void foo() {}
+  private:
+	
+    template<typename T>
+    T SomeField; // expected-error {{member 'SomeField' declared as a template}}
+  };
+
+  void g() {
+    Foo<int> f;
+    f.foo();
+  }
+}