https://git.ruby-lang.org/ruby.git/commit/?id=b877928ca5

From b877928ca562ce1769d821769d3e417ed973b156 Mon Sep 17 00:00:00 2001
From: Akinori MUSHA <knu@i...>
Date: Tue, 16 Jun 2020 23:23:13 +0900
Subject: Fix the ArgumentError message in shellsplit

Change "double quote" to just "quote" because the message is about any type of quotes.

diff --git a/lib/shellwords.rb b/lib/shellwords.rb
index 0bc34fa..4368a53 100644
--- a/lib/shellwords.rb
+++ b/lib/shellwords.rb
@@ -28,7 +28,7 @@ https://github.com/ruby/ruby/blob/trunk/lib/shellwords.rb#L28
 # cause an ArgumentError.
 #
 #   argv = "they all ran after the farmer's wife".shellsplit
-#        #=> ArgumentError: Unmatched double quote: ...
+#        #=> ArgumentError: Unmatched quote: ...
 #
 # Shellwords also provides methods that do the opposite.
 # Shellwords.escape, or its alias, String#shellescape, escapes
@@ -90,7 +90,7 @@ module Shellwords https://github.com/ruby/ruby/blob/trunk/lib/shellwords.rb#L90
     field = String.new
     line.scan(/\G\s*(?>([^\s\\\'\"]+)|'([^\']*)'|"((?:[^\"\\]|\\.)*)"|(\\.?)|(\S))(\s|\z)?/m) do
       |word, sq, dq, esc, garbage, sep|
-      raise ArgumentError, "Unmatched double quote: #{line.inspect}" if garbage
+      raise ArgumentError, "Unmatched quote: #{line.inspect}" if garbage
       # 2.2.3 Double-Quotes:
       #
       #   The <backslash> shall retain its special meaning as an
-- 
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