Created
April 11, 2012 01:53
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| fun occurs (a , Arrow(t,s) ) = (occurs (a,t) orelse occurs (a,s)) | | |
| occurs (a, Product(t,s) ) = (occurs (a,t) orelse occurs (a,s)) | | |
| occurs (t as ref(NONE), TVar(s as ref(NONE))) = (t = s)| | |
| occurs (t, s) = false |
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