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Fix binary search type
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@@ -11,7 +11,7 @@ module BinarySearch
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use import ref.Ref
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use import array.Array
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let binary_search (a : array int) (v : int)
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let binary_search (a : array int) (v : int) : int
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requires { forall i1 i2 : int. 0 <= i1 < i2 < length a -> a[i1] <= a[i2] }
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ensures { 0 <= result <= length a }
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ensures { forall i: int. 0 <= i < result -> a[i] < v }
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