restarts vs debugger command

[73budden .]

Hi!

Thanks for the hint. I took a look at sources. Both solutions have
their advantages.

Slime-asdf works in any CL which supports SLIME. My solution works in
SBCL and Lispworks only but does not require SLIME.

Either variant can be prefferred in different situations.
What goes to name coersion, I'll try to take a look at it in a couple
weeks after my vacations.