gistfile1.diff

diff --git a/lib/power_assert.rb b/lib/power_assert.rb
index 1a19d07..51064f1 100644
--- a/lib/power_assert.rb
+++ b/lib/power_assert.rb
@@ -5,7 +5,23 @@
 require 'power_assert/version'
 
 require 'ripper'
-require 'pattern-match'
+require 'pattern-match/core'
+
+class << Array
+  include PatternMatch::Deconstructable
+
+  def deconstruct(val)
+    accept_self_instance_only(val)
+    val
+  end
+
+  private
+
+  def accept_self_instance_only(val)
+    raise PatternMatch::PatternNotMatch unless val.kind_of?(self)
+  end
+end
+
 
 # NB: API is not fixed