{-!$\#$! TERMINATING !$\#$!-}
loop : !$\mathbb{N}$! !$\rightarrow$! !$\mathbb{N}$!
loop n = loop (pred n)

-- pred : !$\mathbb{N}$! !$\rightarrow$! !$\mathbb{N}$!
-- pred zero    = zero
-- pred (suc n) = n

stop : !$\mathbb{N}$! !$\rightarrow$! !$\mathbb{N}$!
stop zero = zero
stop (suc n) = (stop n)