Assertion failure in theory_seq.cpp

[mrkmarron]

I just triggered an assertion failure in theory_seq.cpp (probably with foldl use). Below is the assertion message and attached is a file that generates the failure. While investigating I also noticed that the lambda quantifiers are also not getting processed in internalize_assertions flow here either (previous issue).

ASSERTION VIOLATION
File: ..\src\smt\theory_seq.cpp
Line: 3076
UNEXPECTED CODE WAS REACHED.
Z3 4.9.2.0
``
[seq_assertion.smt2.txt](https://github.com/Z3Prover/z3/files/9154236/seq_assertion.smt2.txt)
`