diff --git a/ChangeLog b/ChangeLog
index 3ec4f1ad73..540ff70c2a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Sep  6 18:45:46 2003  Mauricio Fernandez <batsman.geo@yahoo.com>
+
+	* parse.y (assignable): call rb_compile_error(), not rb_bug().
+	  [ruby-core:01523]
+
 Sat Sep  6 17:40:41 2003  GOTOU Yuuzou  <gotoyuzo@notwork.org>
 
 	* ext/openssl/ruby_missing.c: rid of unnecessary backward 
diff --git a/parse.y b/parse.y
index 35a94c9e89..259f211beb 100644
--- a/parse.y
+++ b/parse.y
@@ -4856,7 +4856,7 @@ assignable(id, val)
 	return NEW_CVDECL(id, val);
     }
     else {
-	rb_bug("bad id for variable");
+      rb_compile_error("identifier %s is not valid", rb_id2name(id));
     }
     return 0;
 }