2010-05-04  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/43028
	* pt.c (unify): Check each elt for error_mark_node.

	* g++.dg/cpp0x/initlist31.C: New.

--- gcc/testsuite/g++.dg/cpp0x/initlist31.C	(revision 0)
+++ gcc/testsuite/g++.dg/cpp0x/initlist31.C	(revision 159045)
@@ -0,0 +1,13 @@
+// PR c++/43028
+// { dg-options "-std=c++0x" }
+
+#include <initializer_list>
+
+struct string { string(std::initializer_list<char>) { } };
+
+void f() {
+  auto y =
+  {
+    string(Equation()) // { dg-error "not declared" }
+  }; // { dg-error "unable to deduce" }
+}
--- gcc/cp/pt.c	(revision 159044)
+++ gcc/cp/pt.c	(revision 159045)
@@ -13491,6 +13491,10 @@
       FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (arg), i, elt)
 	{
 	  int elt_strict = strict;
+
+	  if (elt == error_mark_node)
+	    return 1;
+
 	  if (!BRACE_ENCLOSED_INITIALIZER_P (elt))
 	    {
 	      tree type = TREE_TYPE (elt);