https://git.ruby-lang.org/ruby.git/commit/?id=0395aa6bbb

From 0395aa6bbb23c2a4c92fbbec87803a9670174d2c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 8 Apr 2021 21:26:10 +0900
Subject: Make the return type of rb_char_next the same as CharNext

---
 eval_intern.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/eval_intern.h b/eval_intern.h
index 9fa9031..3238df1 100644
--- a/eval_intern.h
+++ b/eval_intern.h
@@ -303,14 +303,14 @@ VALUE rb_ec_backtrace_location_ary(const rb_execution_context_t *ec, long lev, l https://github.com/ruby/ruby/blob/trunk/eval_intern.h#L303
 #ifndef CharNext		/* defined as CharNext[AW] on Windows. */
 # ifdef HAVE_MBLEN
 #  define CharNext(p) rb_char_next(p)
-static inline const char *
+static inline char *
 rb_char_next(const char *p)
 {
     if (p) {
         int len = mblen(p, RUBY_MBCHAR_MAXSIZE);
         p += len > 0 ? len : 1;
     }
-    return p;
+    return (char *)p;
 }
 # else
 #  define CharNext(p) ((p) + 1)
-- 
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