Use File.open explicitly.

hsbt · hsbt · commit 5b8f8fc41a5d · 2019-07-22T10:23:43.000+09:00
diff --git a/lib/rake/file_list.rb b/lib/rake/file_list.rb
@@ -294,7 +294,7 @@ def egrep(pattern, *options)
       matched = 0
       each do |fn|
         begin
-          open(fn, "r", *options) do |inf|
+          File.open(fn, "r", *options) do |inf|
             count = 0
             inf.each do |line|
               count += 1
