Ticket #6835: Don't get confused by parentheses while detecting template parameter default values.

lib/templatesimplifier.cpp

@@ -572,6 +572,11 @@ void TemplateSimplifier::useDefaultArgumentValues(const std::list<Token *> &temp
                 continue;
             }
 
+            if (tok->str() == "(") { // Ticket #6835
+                tok = tok->link();
+                continue;
+            }
+
             if (tok->str() == "<" && templateParameters(tok))
                 ++templateParmDepth;
 

test/testgarbage.cpp

@@ -140,6 +140,7 @@ private:
         TEST_CASE(garbageCode98);
         TEST_CASE(garbageCode99);
         TEST_CASE(garbageCode100);
+        TEST_CASE(garbageCode101); // #6835
 
         TEST_CASE(garbageValueFlow);
         TEST_CASE(garbageSymbolDatabase);
@@ -791,6 +792,13 @@ private:
         checkCode("( ) { ( i< ) } int foo ( ) { int i ; ( for ( i => 1 ) ; ) }");
     }
 
+    void garbageCode101() { // #6835
+        // Reported case
+        checkCode("template < class , =( , int) X = 1 > struct A { } ( ) { = } [ { } ] ( ) { A < void > 0 }");
+        // Reduced case
+        checkCode("template < class =( , ) X = 1> struct A {}; A<void> a;");
+    }
+
     void garbageValueFlow() {
         // #6089
         const char* code = "{} int foo(struct, x1, struct x2, x3, int, x5, x6, x7)\n"