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, 1 insertions, 1 deletions

diff --git a/compile.c b/compile.c
index 64bde0c962..e1a8885960 100644
--- a/compile.c
+++ b/compile.c
@@ -1632,7 +1632,7 @@ iseq_set_arguments(rb_iseq_t *iseq, LINK_ANCHOR *const optargs, const NODE *cons
 	debugs("  - argc: %d\n", body->param.lead_num);
 
 	rest_id = args->rest_arg;
-	if (rest_id == 1) {
+	if (rest_id == NODE_SPECIAL_EXCESSED_COMMA) {
 	    last_comma = 1;
 	    rest_id = 0;
 	}