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fix regression from #2061 breaking #2074

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-01-07 16:30:04 -08:00
parent 14f3ff0b63
commit b63a0e31d3
3 changed files with 19 additions and 7 deletions
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10
src/ast/rewriter/seq_rewriter.cpp
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@ -459,9 +459,11 @@ br_status seq_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_SEQ_AT:
SASSERT(num_args == 2);
return mk_seq_at(args[0], args[1], result);
#if 0
case OP_SEQ_NTH:
SASSERT(num_args == 2);
return mk_seq_nth(args[0], args[1], result);
#endif
case OP_SEQ_PREFIX:
SASSERT(num_args == 2);
return mk_seq_prefix(args[0], args[1], result);
@ -896,15 +898,9 @@ br_status seq_rewriter::mk_seq_nth(expr* a, expr* b, expr_ref& result) {
if (m_util.str.is_unit(a, u)) {
if (len == i) {
result = u;
return BR_REWRITE1;
return BR_DONE;
}
}
else if (i > 0) {
SASSERT(len >= i);
result = m_util.str.mk_concat(as.size() - i, as.c_ptr() + i);
result = m().mk_app(m_util.get_family_id(), OP_SEQ_NTH, result, m_autil.mk_int(len - i));
return BR_REWRITE2;
}
else {
return BR_FAILED;
}