Fix Ruby warnings.

Fixes Homebrew/homebrew#11966.

2 files changed, 2 insertions, 0 deletions

diff --git a/Library/Homebrew/extend/fileutils.rb b/Library/Homebrew/extend/fileutils.rb
index eb08ffed4..355829720 100644
--- a/Library/Homebrew/extend/fileutils.rb
+++ b/Library/Homebrew/extend/fileutils.rb
@@ -27,6 +27,7 @@ module FileUtils extend self
   end
 
   # A version of mkdir that also changes to that folder in a block.
+  alias mkdir_old mkdir
   def mkdir name, &block
     FileUtils.mkdir(name)
     if block_given?
diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index caf081f60..3dda828d5 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -117,6 +117,7 @@ class Pathname
   end
 
   # extended to support common double extensions
+  alias extname_old extname
   def extname
     return $1 if to_s =~ bottle_regex
     return $1 if to_s =~ old_bottle_regex