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z3str3: fix Issues 4349, 4354, and 4310 (#4529)

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* regex needs lesson; m.mk_eq not ctx.mk_eq

* when unsat core is of size 0, then do naive learning

* remove two extra comments, and correct positive regex learning

* replace magic numbers for fixed-length lessons with constants
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Federico Mora Rocha 2020-06-24 13:46:32 -07:00 • committed by GitHub
parent c0fbb31379
commit 8d16a9a034
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3 changed files with 36 additions and 29 deletions
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5
src/smt/theory_str.h
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@ -780,6 +780,11 @@ protected:
void get_unique_non_concat_nodes(expr * node, std::set<expr*> & argSet);
bool propagate_length_within_eqc(expr * var);
const rational NEQ = rational(-1); // negative word equation lesson
const rational PFUN = rational(-2); // positive function lesson
const rational NFUN = rational(-3); // negative function lesson
// TESTING
void refresh_theory_var(expr * e);