re PR c++/50059 ([C++0x] Broken error message with __builtin_remquo & constexpr)

	PR c++/50059
	* error.c (dump_expr): Handle MODIFY_EXPR properly.

From-SVN: r177735

gcc/cp/ChangeLog

 2011-08-13  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50059
+	* error.c (dump_expr): Handle MODIFY_EXPR properly.
+
 	* decl.c (grok_reference_init): Handle constexpr here.
 	* call.c (initialize_reference): Not here.
 

gcc/cp/error.c

@@ -1868,6 +1868,10 @@ dump_expr (tree t, int flags)
 
     case INIT_EXPR:
     case MODIFY_EXPR:
+      dump_binary_op (assignment_operator_name_info[(int)NOP_EXPR].name,
+		      t, flags);
+      break;
+
     case PLUS_EXPR:
     case MINUS_EXPR:
     case MULT_EXPR:

gcc/testsuite/ChangeLog

+2011-08-13  Jason Merrill  <jason@redhat.com>
+
+	PR c++/50059
+	* g++.dg/diagnostic/expr1.C: New.
+
 2011-08-12  David Li  <davidxl@google.com>
 
 	* g++.dg/abi/vbase15.C: New test.

gcc/testsuite/g++.dg/diagnostic/expr1.C

+// PR c++/50059
+
+int i;
+struct A { };
+void f(A);
+void g()
+{
+  f(i = 0);			// { dg-error "i = 0" }
+}