1 files changed, 1 insertions, 1 deletions
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;
 }