uses.rb: Pass a block to map instead of a Proc

Passing a `Proc` doesn't work in Ruby 1.8.6 which causes `brew uses` to fail on
Leopard.

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/cmd/uses.rb b/Library/Homebrew/cmd/uses.rb
index a94dc469e..f0654f65d 100644
--- a/Library/Homebrew/cmd/uses.rb
+++ b/Library/Homebrew/cmd/uses.rb
@@ -20,6 +20,6 @@ module Homebrew extend self
         keg.directory? and not keg.subdirs.empty?
       end
     end
-    puts_columns uses.map(&:to_s).sort
+    puts_columns uses.map{|f| f.to_s}.sort
   end
 end