#;4> [panic] Detected corrupted data in stack - execution terminated

...more...
parley.scm:500: state-dirty?-set!
parley.scm:114: ##sys#block-set!
parley.scm:501: state-pos
parley.scm:501: state-line
parley.scm:501: state-in
parley.scm:501: state-out
parley.scm:501: read-one-char
parley.scm:159: char-ready?
parley.scm:160: wait-for-input!
parley.scm:158: g318
parley.scm:127: port->fileno
parley.scm:127: thread-wait-for-i/o!
read-char/port
parley.scm:501: alist-ref
parley.scm:501: g1409
parley.scm:501: object-copy     <--