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Fix sequence foldl nth model propagation

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copilot-swe-agent[bot] 2026-07-13 05:01:29 +00:00 • committed by GitHub
parent 3bfc2ca0b7
commit 026971075b
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2 changed files with 42 additions and 2 deletions
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26
src/test/seq_rewriter.cpp
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@ -22,7 +22,9 @@ Tests:
#include "ast/reg_decl_plugins.h"
#include "ast/rewriter/th_rewriter.h"
#include "ast/seq_decl_plugin.h"
#include "api/z3.h"
#include "smt/smt_context.h"
#include <cstring>
#include <iostream>
// Build a single-char string literal expression.
@ -30,6 +32,28 @@ static expr_ref mk_str(ast_manager& m, seq_util& su, unsigned c) {
return expr_ref(su.str.mk_string(zstring(c)), m);
}
static void test_seq_foldl_nth_model_validation() {
Z3_context ctx = Z3_mk_context(nullptr);
char const* result =
Z3_eval_smtlib2_string(ctx,
"(set-option :model_validate true)\n"
"(declare-const initial Int)\n"
"(declare-const all (Seq Int))\n"
"(declare-const final Int)\n"
"(declare-const elements (Seq Int))\n"
"(define-fun all_sums ((prev_sums (Seq Int)) (elem Int)) (Seq Int)\n"
" (seq.++ (seq.unit (+ (seq.nth prev_sums 0) elem)) prev_sums))\n"
"(assert (= all (seq.foldl all_sums (seq.unit initial) elements)))\n"
"(assert (= final (seq.nth all 0)))\n"
"(assert (= initial 0))\n"
"(assert (= final 6))\n"
"(check-sat)\n"
"(get-model)\n");
ENSURE(std::strstr(result, "sat") != nullptr);
ENSURE(std::strstr(result, "invalid model") == nullptr);
Z3_del_context(ctx);
}
void tst_seq_rewriter() {
ast_manager m;
reg_decl_plugins(m);
@ -255,5 +279,7 @@ void tst_seq_rewriter() {
}
}
test_seq_foldl_nth_model_validation();
std::cout << "tst_seq_rewriter: all tests passed\n";
}