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properly handle recursive function definitions #898

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-03-24 10:10:42 -07:00
parent 3bbe5eceeb
commit e05cee757b
5 changed files with 12 additions and 32 deletions
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7
src/cmd_context/cmd_context.cpp
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@ -739,8 +739,11 @@ void cmd_context::insert_rec_fun(func_decl* f, expr_ref_vector const& binding, s
lhs = m().mk_app(f, binding.size(), binding.c_ptr());
eq = m().mk_eq(lhs, e);
if (!ids.empty()) {
expr* pat = m().mk_pattern(lhs);
eq = m().mk_forall(ids.size(), f->get_domain(), ids.c_ptr(), eq, 0, m().rec_fun_qid(), symbol::null, 1, &pat);
if (!is_app(e)) {
throw cmd_exception("Z3 only supports recursive definitions that are proper terms (not binders or variables)");
}
expr* pats[2] = { m().mk_pattern(lhs), m().mk_pattern(to_app(e)) };
eq = m().mk_forall(ids.size(), f->get_domain(), ids.c_ptr(), eq, 0, m().rec_fun_qid(), symbol::null, 2, pats);
}
//