whileTestP : {l : Level} {t : Set l} @$\rightarrow$@ (c10 : @$\mathbb{N}$@) @$\rightarrow$@ (Code : Envc @$\rightarrow$@ t) @$\rightarrow$@ t
whileTestP c10 next = next (record {c10 = c10 ; varn = c10 ; vari = 0 })

whileLoopP' : {l : Level} {t : Set l} @$\rightarrow$@ Envc @$\rightarrow$@ (next : Envc @$\rightarrow$@ t) @$\rightarrow$@ (exit : Envc @$\rightarrow$@ t) @$\rightarrow$@ t
whileLoopP' record { c10 = c10 ; varn = zero ; vari = vari } _ exit = exit record { c10 = c10 ; varn = zero ; vari = vari }
whileLoopP' record { c10 = c10 ; varn = suc varn1 ; vari = vari } next _ = next (record {c10 = c10 ; varn = varn1 ; vari = suc vari })

{-@$\#$@ TERMINATING @$\#$@-}
loopP : {l : Level} {t : Set l} @$\rightarrow$@ Envc @$\rightarrow$@ (exit : Envc @$\rightarrow$@ t) @$\rightarrow$@ t
loopP env exit = whileLoopP' env (@$\lambda$@ env @$\rightarrow$@ loopP env exit ) exit

whileTestPCall : (c10 :  @$\mathbb{N}$@ ) @$\rightarrow$@ Envc
whileTestPCall c10 = whileTestP {_} {_} c10 (@$\lambda$@ env @$\rightarrow$@ loopP env (@$\lambda$@ env @$\rightarrow$@  env))

-- whileTestPCall 10
-- record { c10 = 10 ; varn = 0 ; vari = 10 }