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davidxifeng/gist:5606948

Created May 19, 2013 07:13
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haskell ADT
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gistfile1.hs
c = let x = 0 : y
y = 1 : x
in
x
-- c [0,1,0,1...]
-- 这种技巧是用来使用data来实现图,双向链表等结构的
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