here's a dirty one, but works.

hi,
I want to create an abstraction that can take an optional symbol as
argument.
if there is a symbol argument then use this, if not then use a default
symbol.

for example
[my_print hello_world!]
would print "hello_world!"

[my_print]
(without argument) would print "default_text"

[my_print 0] or [my_print 123] would also print "default_text".

I tried all variations of route, select, list trim, but could not get it
to work. maybe I forgot something. or maybe there is another trick. I am
using 0.40.
marius.

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