fix bad handling of singletons with write_canonical.
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@@ -3989,7 +3989,7 @@ YAP_ListLength(Term t) {
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Int
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YAP_NumberVars(Term t, Int nbv) {
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return Yap_NumberVars(t, nbv);
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return Yap_NumberVars(t, nbv, FALSE);
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}
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Term
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