geoffb,
Very cool - especially considering you just got Pugs running yesterday. I do want to point out that I believe the coroutine syntax is still unspecced as S17 hasn't been written yet. Additionally, I probably would change:

my &rest = NL2(loop => @loop[1..Inf]);
# to
my &rest = NL2(loop => @loop[1..@loop.end]);
[download]

I know p6 will DWYM, but I think it is clearer that way.