https://git.ruby-lang.org/ruby.git/commit/?id=50872f4a15

From 50872f4a15a2070fa007c1d85fcf44802e4bcc0b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 30 Apr 2019 22:23:20 +0900
Subject: Use array mode of `system` instead of `shellescape`

`&.` is not available in ruby 2.0.

diff --git a/tool/merger.rb b/tool/merger.rb
index 025a559..5f48f2e 100755
--- a/tool/merger.rb
+++ b/tool/merger.rb
@@ -196,10 +196,11 @@ class << Merger https://github.com/ruby/ruby/blob/trunk/tool/merger.rb#L196
 
   def diff(file = nil)
     if svn_mode?
-      `svn diff --diff-cmd=diff -x -upw #{file&.shellescape}`
+      command = %w[svn diff --diff-cmd=diff -x -upw]
     else
-      `git diff --color #{file&.shellescape}`
+      command = %w[git diff --color]
     end
+    IO.popen(command + [file], &:read)
   end
 
   def commit(file)
-- 
cgit v0.10.2


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