Skip to content

Timeout with simple datatype example #7448

@hiroshi-unno

Description

@hiroshi-unno

In Z3 version 4.13.3, the following datatype example causes a timeout in satisfiability checking.

(declare-datatypes ((A4_Box<List> 0)
    (A3_List 0)
    (A1_Tuple<Box<Int>-Box<Box<List>>> 0)
    (A5_Box<Box<List>> 0)
    (A0_Box<Int> 0))
   (
    ((box<List> (box_current<List> A3_List)))
    ((List.Nil) (List.Cons (_getList.Cons A1_Tuple<Box<Int>-Box<Box<List>>>)))
    ((tuple<Box<Int>-Box<Box<List>>> (tuple_proj<Box<Int>-Box<Box<List>>>.0 A0_Box<Int>) (tuple_proj<Box<Int>-Box<Box<List>>>.1 A5_Box<Box<List>>)))
    ((box<Box<List>> (box_current<Box<List>> A4_Box<List>)))
    ((box<Int> (box_current<Int> Int)))
   ))
(declare-fun |#tvar3358| () A3_List)
(declare-fun |#tvar3356| () A1_Tuple<Box<Int>-Box<Box<List>>>)
(assert (and (not (= (List.Cons |#tvar3356|) |#tvar3358|))
     (not (= List.Nil |#tvar3358|))))

(check-sat)
(exit)

Simplifying the datatype slightly returns "sat" immediately, suggesting a potential bug.

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions