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]>