re PR c++/56060 (ICE on invalid code in type_dependent_expression_p, at cp/pt.c:19742)

/cp
2013-10-06  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/56060
	* pt.c (type_dependent_expression_p): Handle EXPR_PACK_EXPANSION.

/testsuite
2013-10-06  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/56060
	* g++.dg/cpp0x/variadic144.C: New.

From-SVN: r203229

gcc/cp/ChangeLog

+2013-10-06  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/56060
+	* pt.c (type_dependent_expression_p): Handle EXPR_PACK_EXPANSION.
+
 2013-10-04  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/58560

gcc/cp/pt.c

@@ -20403,6 +20403,10 @@ type_dependent_expression_p (tree expression)
       if (TREE_CODE (expression) == SCOPE_REF)
 	return false;
 
+      /* Always dependent, on the number of arguments if nothing else.  */
+      if (TREE_CODE (expression) == EXPR_PACK_EXPANSION)
+	return true;
+
       if (BASELINK_P (expression))
 	expression = BASELINK_FUNCTIONS (expression);
 

gcc/testsuite/ChangeLog

+2013-10-06  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/56060
+	* g++.dg/cpp0x/variadic144.C: New.
+
 2013-10-04  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/58560

gcc/testsuite/g++.dg/cpp0x/variadic144.C

+// PR c++/56060
+// { dg-do compile { target c++11 } }
+
+template<typename T> struct baz { };
+template<typename T> T bar();
+
+template<typename T, typename ... U>
+baz<decltype(bar<T>()(bar<U> ...))>  // { dg-error "cannot be used" }
+foo();
+
+int main()
+{
+  foo<int>();     // { dg-error "no matching" }
+  return 0;
+}