https://git.ruby-lang.org/ruby.git/commit/?id=a070d4cceb

From a070d4ccebd677a92af5e8350d89079a47fef5ee Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 5 Jul 2022 09:30:05 +0900
Subject: Local functions should be `static`

---
 ext/objspace/objspace_dump.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ext/objspace/objspace_dump.c b/ext/objspace/objspace_dump.c
index 18e052f210..c6c85aec99 100644
--- a/ext/objspace/objspace_dump.c
+++ b/ext/objspace/objspace_dump.c
@@ -313,8 +313,9 @@ reachable_object_i(VALUE ref, void *data) https://github.com/ruby/ruby/blob/trunk/ext/objspace/objspace_dump.c#L313
     dc->cur_obj_references++;
 }
 
-bool
-dump_string_ascii_only(const char *str, long size) {
+static bool
+dump_string_ascii_only(const char *str, long size)
+{
     for (long i = 0; i < size; i++) {
         if (str[i] & 0x80) {
             return false;
-- 
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