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Weird non-lisp errors with capturing labels with a lambda and `reduce`

lambda,crash,closures,common-lisp,allegro-cl
I stumbled across a very weird bug (?) while I was developing an application in Allegro Common Lisp, v9.0 for Windows. I do not get the regular lisp errors, instead I get system errors encapsulated in a lisp condition. I managed to create a simple test-case to reproduce the error...