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proof smt.clause_proof Assertion violation at ../src/ast/ast.cpp Line: 3136 #3676

@muchang

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@muchang

Hi,
For this formula:

(set-option :proof true)
(set-option :smt.clause_proof true)
(declare-fun a (Int) Bool)
(assert (forall ((b Int)) (or (and (a b) (< b 1)) (a (- b 1)))))
(check-sat)

Z3 throws out an assertion violation:

ASSERTION VIOLATION
File: ../src/ast/ast.cpp
Line: 3136
found.get(i, false)
(C)ontinue, (A)bort, (S)top, (T)hrow exception, Invoke (G)DB

OS: Ubuntu 18.04
Commit: b686bb6

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