ref: 9fc485a80b9713c1581a3c734d2d2bbf347f80e7
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 }