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Potential completeness issue on a simple instance involving str.replace_all #7391

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merlinsun opened this issue Sep 22, 2024 · 0 comments
Closed

Potential completeness issue on a simple instance involving str.replace_all #7391

merlinsun opened this issue Sep 22, 2024 · 0 comments

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@merlinsun
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Hi,
For the following instance, z3 (fa7fc8e, debug build) gives unknown.

$ cat unknown.smt2 
(declare-fun a () String)
(assert (= a (str.replace_all "" a "")))
(check-sat)
$ z3 unknown.smt2 
unknown

If (str.replace_all "" a "") can be simplified to "", z3 returns sat.

$ cat pass.smt2 
(declare-fun a () String)
(assert (= a ""))
(check-sat)
$ z3 pass.smt2 
sat
NikolajBjorner added a commit that referenced this issue Sep 22, 2024
@NikolajBjorner
#7391
96c1375 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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@NikolajBjorner @merlinsun
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