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StackOverflowError with infinite terms #124

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s-webber opened this issue Sep 2, 2018 · 1 comment
Open

StackOverflowError with infinite terms #124

s-webber opened this issue Sep 2, 2018 · 1 comment
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s-webber commented Sep 2, 2018

Infinite terms (also known as "cyclic terms") cause a StackOverflowError.

Example:

X = p(X).
@s-webber s-webber self-assigned this Sep 2, 2018
s-webber added a commit that referenced this issue Sep 2, 2018
@s-webber
test of infinite terms - #124
eb1749f 
Added unit-test to confirm that a StackOverflowError is thrown when
using infinite terms (also known as "cyclic terms").
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s-webber commented Oct 27, 2018 •
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Note that the unify_with_occurs_check/2 predicate can be used instead of =/2 to guard against the creation of cyclic terms during unification. #157

Examples:

?- unify_with_occurs_check(X, p(Y)).

X = p(Y)
Y = Y

yes

?- unify_with_occurs_check(X, p(X)).

no

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