ref: b8545d80c9f3e18e2357be1a44b69dc9ad914458
dir: /test/occur.myr/
/* checks that f is not an infinite type (ie, the type
doesn't exist within itself). If 'f' typechecked,
it's type would be:
f : (-> (-> (-> ... ad infinitum ...)))
*/
const f = {
-> f
}