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Assertion violation at ../src/ast/seq_decl_plugin.cpp Line: 919 #4355

@muchang

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@muchang

Hi,
For this formula:

(assert (= "" (str.replace_all "" "" "")))
(check-sat)

Z3 throws out an assertion violation:

ASSERTION VIOLATION
File: ../src/ast/seq_decl_plugin.cpp
Line: 919
UNREACHABLE CODE WAS REACHED.
Z3 4.8.9.0
Please file an issue with this message and more detail about how you encountered it at https://github.com/Z3Prover/z3/issues/new

OS: Ubuntu 18.04
Commit: fc8dfe3

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