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Remove is_nullable_rec from seq_rewriter, delegate to derive::nullable

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copilot-swe-agent[bot] 2026-06-10 18:53:55 +00:00 • committed by Nikolaj Bjorner
parent 70a9dbfae2
commit 1e906ba585
4 changed files with 8 additions and 117 deletions
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src/ast/rewriter/seq_rewriter.h
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@ -178,7 +178,6 @@ class seq_rewriter {
void replace_all_subvectors(expr_ref_vector const& as, expr_ref_vector const& bs, expr* c, expr_ref_vector& result);
// Calculate derivative, memoized and enforcing a normal form
expr_ref is_nullable_rec(expr* r);
expr_ref mk_der_op(decl_kind k, expr* a, expr* b);
expr_ref mk_der_op_rec(decl_kind k, expr* a, expr* b);
expr_ref mk_der_concat(expr* a, expr* b);
@ -189,8 +188,6 @@ class seq_rewriter {
expr_ref mk_der_cond(expr* cond, expr* ele, sort* seq_sort);
expr_ref mk_der_antimirov_union(expr* r1, expr* r2);
bool ite_bdds_compatible(expr* a, expr* b);
/* if r has the form deriv(en..deriv(e1,to_re(s))..) returns 's = [e1..en]' else returns '() in r'*/
expr_ref is_nullable_symbolic_regex(expr* r, sort* seq_sort);
#ifdef Z3DEBUG
bool check_deriv_normal_form(expr* r, int level = 3);
#endif