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fix #876

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-12-10 14:11:00 -08:00
parent 68ace83893
commit b40c2b2926
3 changed files with 63 additions and 24 deletions
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11
src/ast/rewriter/seq_rewriter.cpp
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@ -386,7 +386,7 @@ eautomaton* re2automaton::seq2aut(expr* e) {
br_status seq_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) {
SASSERT(f->get_family_id() == get_fid());
TRACE("seq", tout << f->get_name() << "\n";);
br_status st = BR_FAILED;
switch(f->get_decl_kind()) {
@ -400,16 +400,19 @@ br_status seq_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
return mk_re_plus(args[0], result);
case OP_RE_STAR:
SASSERT(num_args == 1);
return mk_re_star(args[0], result);
st = mk_re_star(args[0], result);
break;
case OP_RE_OPTION:
SASSERT(num_args == 1);
return mk_re_opt(args[0], result);
case OP_RE_CONCAT:
if (num_args == 1) {
result = args[0]; return BR_DONE;
result = args[0];
return BR_DONE;
}
SASSERT(num_args == 2);
return mk_re_concat(args[0], args[1], result);
st = mk_re_concat(args[0], args[1], result);
break;
case OP_RE_UNION:
if (num_args == 1) {
result = args[0]; return BR_DONE;