module util
imports libstrategolib
rules
join(|infix) : [] -> ""
join(|infix) : [x | xs] -> <conc-strings>(x, <prejoin(|infix)>xs)
prejoin(|infix) : [] -> ""
prejoin(|infix) : [x | xs] -> <concat-strings>[infix,x,<prejoin(|infix)>xs]