Issue 6910 - __traits(hasMember, "<name>") does not work, if template…

… has alias param

src/mtype.c

@@ -7251,7 +7251,8 @@ Expression *TypeStruct::dotExp(Scope *sc, Expression *e, Identifier *ident)
             e = e->semantic(sc);
             return e;
         }
-        if (d->needThis() && fd && fd->vthis)
+        else if (d->needThis() && fd && fd->vthis &&
+                 fd->toParent2()->isStructDeclaration() == sym)
         {
             e = new DotVarExp(e->loc, new ThisExp(e->loc), d);
             e = e->semantic(sc);

test/runnable/xtest46.d

@@ -3982,6 +3982,44 @@ void test6859()
     printf("done.\n");
 }
 
+/***************************************************/
+// 6910
+
+template Test6910(alias i, B)
+{
+    void fn()
+    {
+        foreach(t; B.Types)
+        {
+            switch(i)
+            {
+                case 0://IndexOf!(t, B.Types):
+                {
+                    pragma(msg, __traits(allMembers, t));
+                    pragma(msg, __traits(hasMember, t, "m"));
+                    static assert(__traits(hasMember, t, "m")); // test
+                    break;
+                }
+                default: {}
+            }
+        }
+    }
+}
+void test6910()
+{
+    static struct Bag(S...)
+    {
+        alias S Types;
+    }
+    static struct A
+    {
+        int m;
+    }
+
+    int i;
+    alias Test6910!(i, Bag!(A)).fn func;
+}
+
 /***************************************************/
 
 int main()
@@ -4176,6 +4214,7 @@ int main()
     test6733();
     test6813();
     test6859();
+    test6910();
 
     printf("Success\n");
     return 0;