Improve type-checking of templates by distinguishing between members

of the current instantiation and members of an unknown specialization
when type-checking a qualified-if expression.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89653 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaExpr.cpp

@@ -673,12 +673,8 @@ Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc,
   if (SS && SS->isInvalid())
     return ExprError();
 
-  // C++ [temp.dep.expr]p3:
-  //   An id-expression is type-dependent if it contains:
-  //     -- a nested-name-specifier that contains a class-name that
-  //        names a dependent type.
-  // FIXME: Member of the current instantiation.
-  if (SS && isDependentScopeSpecifier(*SS)) {
+  // Determine whether this is a member of an unknown specialization.
+  if (SS && SS->isSet() && !computeDeclContext(*SS, false)) {
     return Owned(new (Context) DependentScopeDeclRefExpr(Name, Context.DependentTy,
                                                      Loc, SS->getRange(),
                 static_cast<NestedNameSpecifier *>(SS->getScopeRep()),

test/SemaTemplate/current-instantiation.cpp

@@ -142,3 +142,12 @@ struct X0<T*, U*> {
     void g8(typename ::X0<typename X0<T_type*, U*>::X2::my_T_type*, U_type*>::X2::my_T_type&); // expected-error{{redecl}}
   };
 };
+
+template<typename T>
+struct X1 {
+  static int *a;
+  void f(float *b) {
+    X1<T>::a = b; // expected-error{{incompatible}}
+    X1<T*>::a = b;
+  }
+};