whileTestPwP : {l : Level} {t : Set l} @$\rightarrow$@ (c10 : @$\mathbb{N}$@) @$\rightarrow$@
             ((env : Envc ) @$\rightarrow$@ (mdg : (vari env @$\equiv$@ 0) @$\wedge$@ (varn env @$\equiv$@ c10 env)) @$\rightarrow$@ t) @$\rightarrow$@ t
whileTestPwP c10 next = next env record { pi1 = refl ; pi2 = refl } where
  env : Envc
  env = whileTestP c10 ( @$\lambda$@ env @$\rightarrow$@ env )