https://git.ruby-lang.org/ruby.git/commit/?id=7d02bab0b0

From 7d02bab0b080bbf5f7dd3f29de57a52677e39a51 Mon Sep 17 00:00:00 2001
From: NAKAMURA Usaku <usa@r...>
Date: Fri, 3 May 2019 06:24:57 +0900
Subject: Nil cannot and should not convert to a string


diff --git a/tool/merger.rb b/tool/merger.rb
index 56b7b4a..f5ed985 100755
--- a/tool/merger.rb
+++ b/tool/merger.rb
@@ -200,7 +200,7 @@ class << Merger https://github.com/ruby/ruby/blob/trunk/tool/merger.rb#L200
     else
       command = %w[git diff --color]
     end
-    IO.popen(command + [file], &:read)
+    IO.popen(command + [file].compact, &:read)
   end
 
   def commit(file)
-- 
cgit v0.10.2


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