981 Prefer must_be/2
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@@ -123,5 +123,5 @@ rational_numerator_denominator(R, N, D) :-
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number_chars(D, Ds).
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number_chars(D, Ds).
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popcount(X, N) :-
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popcount(X, N) :-
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integer(X),
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must_be(integer, X),
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'$popcount'(X, N).
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'$popcount'(X, N).
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