Merge branch 'fix_negative_array_indexing' of...

Merge branch 'fix_negative_array_indexing' of github.com:presidentbeef/brakeman into fix_negative_array_indexing

lib/brakeman/processors/alias_processor.rb

@@ -452,11 +452,7 @@ class Brakeman::AliasProcessor < Brakeman::SexpProcessor
       index = args[0][1]
 
       #Have to do this because first element is :array and we have to skip it
-      if index >= 0
-        target[index + 1]
-      else
-        target[index - 1]
-      end
+      target[1..-1][index + 1]
     else
       nil
     end

test/apps/rails3.1/lib/somelib.rb

@@ -2,5 +2,6 @@ class MyLib
   def test_negative_array_index
     #This should not cause an error, but it used to
     [][-1]
+    [-1][-1]
   end
 end