call.c (print_conversion_rejection): Handle n_arg of -2.

	* call.c (print_conversion_rejection): Handle n_arg of -2.
	(build_user_type_conversion_1): Pass it.

From-SVN: r208158

gcc/cp/ChangeLog

 2014-02-25  Jason Merrill  <jason@redhat.com>
 
+	* call.c (print_conversion_rejection): Handle n_arg of -2.
+	(build_user_type_conversion_1): Pass it.
+
 	PR c++/55877
 	* decl2.c (no_linkage_error): Handle C++98 semantics.
 	(reset_type_linkage): Move from decl.c.

gcc/cp/call.c

@@ -3180,6 +3180,10 @@ print_conversion_rejection (location_t loc, struct conversion_info *info)
     inform (loc, "  no known conversion for implicit "
 	    "%<this%> parameter from %qT to %qT",
 	    info->from_type, info->to_type);
+  else if (info->n_arg == -2)
+    /* Conversion of conversion function return value failed.  */
+    inform (loc, "  no known conversion from %qT to %qT",
+	    info->from_type, info->to_type);
   else
     inform (loc, "  no known conversion for argument %d from %qT to %qT",
 	    info->n_arg+1, info->from_type, info->to_type);
@@ -3604,7 +3608,7 @@ build_user_type_conversion_1 (tree totype, tree expr, int flags,
 	  if (!ics)
 	    {
 	      cand->viable = 0;
-	      cand->reason = arg_conversion_rejection (NULL_TREE, -1,
+	      cand->reason = arg_conversion_rejection (NULL_TREE, -2,
 						       rettype, totype);
 	    }
 	  else if (DECL_NONCONVERTING_P (cand->fn)
@@ -3624,7 +3628,7 @@ build_user_type_conversion_1 (tree totype, tree expr, int flags,
 	    {
 	      cand->viable = -1;
 	      cand->reason
-		= bad_arg_conversion_rejection (NULL_TREE, -1,
+		= bad_arg_conversion_rejection (NULL_TREE, -2,
 						rettype, totype);
 	    }
 	  else if (primary_template_instantiation_p (cand->fn)