Use an offensive copy in Array#permutation. Fixes rubinius#775

jvoorhis · May 2, 2011 · 02330f0 · 02330f0
1 parent bc0f22e
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diff --git a/kernel/common/array.rb b/kernel/common/array.rb
@@ -1259,7 +1259,15 @@ def permutation(num=undefined, &block)
       perm = Array.new(num)
       used = Array.new(@total, false)
 
-      __permute__(num, perm, 0, used, &block)
+      if block
+        # offensive (both definitions) copy.
+        offensive = dup
+        Rubinius.privately do
+          offensive.__permute__(num, perm, 0, used, &block)
+        end
+      else
+        __permute__(num, perm, 0, used, &block)
+      end
     end
 
     self

diff --git a/spec/tags/ruby/core/array/permutation_tags.txt b/spec/tags/ruby/core/array/permutation_tags.txt