https://git.ruby-lang.org/ruby.git/commit/?id=c76508b88c

From c76508b88c083c29aaafaec7d67072b45f7e40aa Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 31 Aug 2020 21:47:25 +0900
Subject: [ruby/strscan] Replaced examples using $KCODE with encodings

`$KCODE` has been deprecated and not effective since years ago.

https://github.com/ruby/strscan/commit/7c4dbd4cb3

diff --git a/ext/strscan/strscan.c b/ext/strscan/strscan.c
index a484a47..2294d92 100644
--- a/ext/strscan/strscan.c
+++ b/ext/strscan/strscan.c
@@ -848,9 +848,8 @@ adjust_registers_to_matched(struct strscanner *p) https://github.com/ruby/ruby/blob/trunk/ext/strscan/strscan.c#L848
  *   s.getch           # => "b"
  *   s.getch           # => nil
  *
- *   $KCODE = 'EUC'
- *   s = StringScanner.new("\244\242")
- *   s.getch           # => "\244\242"   # Japanese hira-kana "A" in EUC-JP
+ *   s = StringScanner.new("\244\242".force_encoding("euc-jp"))
+ *   s.getch           # => "\x{A4A2}"   # Japanese hira-kana "A" in EUC-JP
  *   s.getch           # => nil
  */
 static VALUE
@@ -885,10 +884,9 @@ strscan_getch(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/strscan/strscan.c#L884
  *   s.get_byte         # => "b"
  *   s.get_byte         # => nil
  *
- *   $KCODE = 'EUC'
- *   s = StringScanner.new("\244\242")
- *   s.get_byte         # => "\244"
- *   s.get_byte         # => "\242"
+ *   s = StringScanner.new("\244\242".force_encoding("euc-jp"))
+ *   s.get_byte         # => "\xA4"
+ *   s.get_byte         # => "\xA2"
  *   s.get_byte         # => nil
  */
 static VALUE
-- 
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