[slim-vim] ECL + Vim, debugging issues

[Brad Beveridge]

I'm writing this from work where I don't have an ECL Vim handy, but my
memory ought to be good enough.
I have occasionally run into errors that crash my Vim out to an ECL
REPL.  Normally this would be fine, but Vim messes with the ususal
console behaviour, so you end up with a console that will accept
keystrokes, but won't echo them.

I usually run into this problem when my Slim-vim code references a
symbol that doesn't exist, or calls a function that doesn't exist.  I
occasionally mess up and rename stuff, but not in all the right places
:)  I haven't looked into this at all, but it doesn't seem reasonable
to break Vim quite so badly.  This isn't bothering me enough to fix
myself (yet!), but I thought I'd document it.  Maybe some kind soul
will look into it :)

I suspect something like ":ecl (blah)", where BLAH doesn't exist will
probably reproduce this.

Cheers
Brad