merges r28101 from trunk into ruby_1_9_2.

--
* insns.def (defined): respond_to_missing? may not be available
  (for BasicObject instances).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@28267 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 2 deletions

diff --git a/insns.def b/insns.def
index 23c0143907..f75007dca2 100644
--- a/insns.def
+++ b/insns.def
@@ -799,8 +799,15 @@ defined
 		}
 	    }
 	}
-	if (RTEST(rb_funcall(v, rb_intern("respond_to_missing?"), 2, obj, Qfalse)))
-	    expr_type = "method";
+	{
+	    VALUE args[2];
+	    VALUE r;
+
+	    args[0] = obj; args[1] = Qfalse;
+	    r = rb_check_funcall(v, rb_intern("respond_to_missing?"), 2, args);
+	    if (r != Qundef && RTEST(r)) 
+		expr_type = "method";
+	}
 	break;
       }
       case DEFINED_YIELD: