https://git.ruby-lang.org/ruby.git/commit/?id=43c337dfc1

From 43c337dfc18676e95f9fb9b1d6bf3beb3ec6b306 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sun, 14 Jul 2019 23:04:48 +0900
Subject: string.c (str_succ): refactoring

Use more communicative variable name

diff --git a/string.c b/string.c
index aadc725..fcaf280 100644
--- a/string.c
+++ b/string.c
@@ -4125,7 +4125,7 @@ str_succ(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L4125
 {
     rb_encoding *enc;
     char *sbeg, *s, *e, *last_alnum = 0;
-    int c = -1;
+    int found_alnum = 0;
     long l, slen;
     char carry[ONIGENC_CODE_TO_MBC_MAXLEN] = "\1";
     long carry_pos = 0, carry_len = 1;
@@ -4158,11 +4158,11 @@ str_succ(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L4158
 	    last_alnum = s;
 	    break;
 	}
-        c = 1;
+        found_alnum = 1;
         carry_pos = s - sbeg;
         carry_len = l;
     }
-    if (c == -1) {		/* str contains no alnum */
+    if (!found_alnum) {		/* str contains no alnum */
 	s = e;
 	while ((s = rb_enc_prev_char(sbeg, s, e, enc)) != 0) {
             enum neighbor_char neighbor;
-- 
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