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fix unexpected error in length/2 (#1303)

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Mark Thom
2022-02-26 11:07:38 -07:00
parent 96faad1c01
commit d4d135f2a9
1 changed files with 1 additions and 1 deletions
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2
src/lib/lists.pl
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@@ -54,7 +54,7 @@ length(Xs0, N) :-
'$skip_max_list'(M, N, Xs0,Xs),
!,
( Xs == [] -> N = M
; nonvar(Xs) -> var(N), throw(error(resource_error(finite_memory),length/2))
; nonvar(Xs) -> var(N), Xs = [_|_], throw(error(resource_error(finite_memory),length/2))
; nonvar(N) -> R is N-M, length_rundown(Xs, R)
; N == Xs -> throw(error(resource_error(finite_memory),length/2))
; length_addendum(Xs, N, M)