debug enable seems broken in 3.0

[dsmich]

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]>