node.h: Avoid a magic number to represent excessed comma

`(ID)1` was assigned to NODE_ARGS#rest_arg for `{|x,| }`.
This change removes the magic number by introducing an explicit macro
variable for it: NODE_SPECIAL_EXCESSED_COMMA.

1 files changed, 8 insertions, 1 deletions

diff --git a/node.c b/node.c
index 558a4cef47..864e115472 100644
--- a/node.c
+++ b/node.c
@@ -1010,7 +1010,14 @@ dump_node(VALUE buf, VALUE indent, int comment, const NODE * node)
 	F_INT(nd_ainfo->post_args_num, "count of mandatory post-arguments");
 	F_NODE(nd_ainfo->post_init, "initialization of post-arguments");
 	F_ID(nd_ainfo->first_post_arg, "first post argument");
-	F_ID(nd_ainfo->rest_arg, "rest argument");
+        F_CUSTOM1(nd_ainfo->rest_arg, "rest argument") {
+            if (node->nd_ainfo->rest_arg == NODE_SPECIAL_EXCESSED_COMMA) {
+		A("1 (excessed comma)");
+	    }
+	    else {
+		A_ID(node->nd_ainfo->rest_arg);
+	    }
+	}
 	F_ID(nd_ainfo->block_arg, "block argument");
 	F_NODE(nd_ainfo->opt_args, "optional arguments");
 	F_NODE(nd_ainfo->kw_args, "keyword arguments");