https://git.ruby-lang.org/ruby.git/commit/?id=e0c6e8c64a

From e0c6e8c64ac3d7cf05a40acacb36dc60924af897 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Thu, 23 Sep 2021 09:20:00 +0900
Subject: [DOC] Use `unpack1` instead of `unpack(template)[0]` [ci skip]

---
 ext/socket/basicsocket.c | 2 +-
 io.c                     | 2 +-
 string.c                 | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/ext/socket/basicsocket.c b/ext/socket/basicsocket.c
index 8477a37..44fb7a4 100644
--- a/ext/socket/basicsocket.c
+++ b/ext/socket/basicsocket.c
@@ -306,7 +306,7 @@ bsock_setsockopt(int argc, VALUE *argv, VALUE sock) https://github.com/ruby/ruby/blob/trunk/ext/socket/basicsocket.c#L306
  *   ipttl = sock.getsockopt(:IP, :TTL).int
  *
  *   optval = sock.getsockopt(Socket::IPPROTO_IP, Socket::IP_TTL)
- *   ipttl = optval.unpack("i")[0]
+ *   ipttl = optval.unpack1("i")
  *
  * Option values may be structs. Decoding them can be complex as it involves
  * examining your system headers to determine the correct definition. An
diff --git a/io.c b/io.c
index e2f6875..0e11b8a 100644
--- a/io.c
+++ b/io.c
@@ -3324,7 +3324,7 @@ io_write_nonblock(rb_execution_context_t *ec, VALUE io, VALUE str, VALUE ex) https://github.com/ruby/ruby/blob/trunk/io.c#L3324
  *     # each record is prefixed by its 32-bit length
  *     open("variable-record-file") do |f|
  *       while len = f.read(4)
- *         len = len.unpack("N")[0]   # 32-bit length
+ *         len = len.unpack1("N")     # 32-bit length
  *         record = f.read(len)       # This returns a string even if len is 0.
  *       end
  *     end
diff --git a/string.c b/string.c
index 7f9559c..299d506 100644
--- a/string.c
+++ b/string.c
@@ -10831,7 +10831,7 @@ enc_str_scrub(rb_encoding *enc, VALUE str, VALUE repl, int cr) https://github.com/ruby/ruby/blob/trunk/string.c#L10831
  *
  *     "abc\u3042\x81".scrub #=> "abc\u3042\uFFFD"
  *     "abc\u3042\x81".scrub("*") #=> "abc\u3042*"
- *     "abc\u3042\xE3\x80".scrub{|bytes| '<'+bytes.unpack('H*')[0]+'>' } #=> "abc\u3042<e380>"
+ *     "abc\u3042\xE3\x80".scrub{|bytes| '<'+bytes.unpack1('H*')+'>' } #=> "abc\u3042<e380>"
  */
 static VALUE
 str_scrub(int argc, VALUE *argv, VALUE str)
@@ -10853,7 +10853,7 @@ str_scrub(int argc, VALUE *argv, VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L10853
  *
  *     "abc\u3042\x81".scrub! #=> "abc\u3042\uFFFD"
  *     "abc\u3042\x81".scrub!("*") #=> "abc\u3042*"
- *     "abc\u3042\xE3\x80".scrub!{|bytes| '<'+bytes.unpack('H*')[0]+'>' } #=> "abc\u3042<e380>"
+ *     "abc\u3042\xE3\x80".scrub!{|bytes| '<'+bytes.unpack1('H*')+'>' } #=> "abc\u3042<e380>"
  */
 static VALUE
 str_scrub_bang(int argc, VALUE *argv, VALUE str)
-- 
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