if True, () -> log "hello"
if! True, () => print! "hello"
# if True, () => print! "hello" # this should cause a type error
if True, () ->
    _x = "aaa" + input!() # this should cause an effect error
    print! "hello" # this should cause an effect error

f x: Int = log x
g x: Int = print! x # this should cause an effect error