From 5e3e9824428ec486db9d216848f3ff73777d9645 Mon Sep 17 00:00:00 2001
From: dearblue <dearblue@gmx.com>
Date: Wed, 8 Apr 2026 21:18:41 +0900
Subject: [PATCH] Improve the calculation of the next index for
 `Array#__combination_next`

When the index wraps around, the lower index becomes a fixed value.
---
 mrbgems/mruby-array-ext/src/array.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/mrbgems/mruby-array-ext/src/array.c b/mrbgems/mruby-array-ext/src/array.c
index 70473c087..68383c2e5 100644
--- a/mrbgems/mruby-array-ext/src/array.c
+++ b/mrbgems/mruby-array-ext/src/array.c
@@ -1627,13 +1627,9 @@ ary_combination_next(mrb_state *mrb, mrb_value self)
   }
   else {
     /* Reset dependent indices */
-    for (mrb_int i = pos + 1; i < state->n; i++) {
-      if (state->permutation) {
-        state->indices[i] = 0;
-      }
-      else {
-        state->indices[i] = state->indices[i - 1];
-      }
+    mrb_int reset = state->permutation ? 0 : state->indices[pos];
+    for (pos++; pos < state->n; pos++) {
+      state->indices[pos] = reset;
     }
   }