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Failed to verify on NIRA formula with horn  #3859

@muchang

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@muchang

Hi,
For this formula:

(assert (exists ((a Real)) (>= (* (to_real (to_int a)) (/ 0 a)) 0)))
(check-sat)
(check-sat-using horn)

Z3 throws out a Failed to verify:

[902] % z3 small.smt2
sat
Failed to verify: lemma->get_pob()->pt().check_inductive(lemma->level(), cube, uses_level, lemma->weakness())
[903] % 
[903] % cat small.smt2
(assert (exists ((a Real)) (>= (* (to_real (to_int a)) (/ 0 a)) 0)))
(check-sat)
(check-sat-using horn)
[904] %

OS: Ubuntu 18.04
Commit: 5c9fd90

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