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add lower bounds on lengths if they are not present

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-15 15:54:40 -07:00
parent e6174c89f3
commit d465938496
1 changed files with 3 additions and 1 deletions
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4
src/smt/theory_seq.cpp
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@ -549,7 +549,7 @@ bool theory_seq::branch_unit_variable() {
break; break;
} }
} }
CTRACE("seq", result, tout << "branch unit variable";); CTRACE("seq", result, tout << "branch unit variable\n";);
return result; return result;
} }
@ -5516,6 +5516,8 @@ bool theory_seq::get_length(expr* e, rational& val) {
val += rational(s.length()); val += rational(s.length());
} }
else if (!has_length(c)) { else if (!has_length(c)) {
len = mk_len(c);
add_axiom(mk_literal(m_autil.mk_ge(len, m_autil.mk_int(0))));
TRACE("seq", tout << "literal has no length " << mk_pp(c, m) << "\n";); TRACE("seq", tout << "literal has no length " << mk_pp(c, m) << "\n";);
return false; return false;
} }