Disallow numbered parameter as the default value of optional argument

[Fix GH-2139] [Bug #15783]

1 files changed, 1 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index a97c01d69a..553f085937 100644
--- a/parse.y
+++ b/parse.y
@@ -4735,6 +4735,7 @@ f_norm_arg	: f_bad_arg
 		| tIDENTIFIER
 		    {
 			formal_argument(p, get_id($1));
+			p->max_numparam = -1;
 			$$ = $1;
 		    }
 		;