Hi, I tried to compile val n = [ 1, 2, 3 ] fun main () = return <xml> Hello World! </xml> but got /home/gergoe/local/sandbox/foo.ur:1:0-1:3: syntax error: replacing VAL with CON Parse failure Is the only way to define a list in Ur is to write 1 :: 2 :: 3 :: [] ? - Gergely