From 5bad1c742927bd8569575e2f3f955d08fd4f6e8a Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 8 Dec 2021 16:22:24 +0900
Subject: vm.c: fix `mrb_ci_kidx`.

It used to return wrong value for 14 positional arguments.
---
 src/vm.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/vm.c b/src/vm.c
index 2cc8412ad..31e1e4bd1 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -394,10 +394,9 @@ mrb_funcall_id(mrb_state *mrb, mrb_value self, mrb_sym mid, mrb_int argc, ...)
 }
 
 static mrb_int
-mrb_ci_kidx(mrb_callinfo *ci)
+mrb_ci_kidx(const mrb_callinfo *ci)
 {
-  if (ci->nk == 0) return -1;
-  return (ci->n % 14) + 1;
+  return (ci->n == CALL_MAXARGS) ? 2 : ci->n + 1;
 }
 
 static mrb_int
-- 
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