t1_1.gom

/* valid */

module Foo
imports int String char
abstract syntax

T1 = f(x:T2,y:T1) | a(x:T2)
T2 = g(x:T1,y:T2) | b()
T3 = S(x:String)
T4 = T(x:char)

List = List(T1*)
IList = iList(int*)
IList2 = iList21(int*) | iList22(int*)