This ought to work, right?
From a fresh 3.0 install from tarball on Debian Buster:
$ guile
GNU Guile 3.0.0
Copyright (C) 1995-2020 Free Software Foundation, Inc.
Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.
Enter `,help' for help.
scheme@(guile-user)> (debug-enable 'debug)
ice-9/boot-9.scm:1669:16: In procedure raise-exception:
In procedure debug-options-interface: Unknown option name: debug
Entering a new prompt. Type `,bt' for a backtrace or `,q' to
continue.
scheme@(guile-user) [1]> ,bt
In ice-9/boot-9.scm:
3609:0 2 (debug-enable . _)
In unknown file:
1 (debug-options-interface (debug show-file-name #t # # …))
In ice-9/boot-9.scm:
1669:16 0 (raise-exception _ #:continuable? _)
scheme@(guile-user) [1]>
