ref: 8c37b110a65ac1365ac9d0ae600a5cd368c11c34
dir: /test/occur.myr/
use std /* 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 : (std.exit((-> (-> ... ad infinitum ...)))) */ const f = { std.exit(f) }