λ x : word64 * word64 * word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x7, x8, x6, x4, x2)%core,
 uint64_t x9 = (x8 | x7);
 uint64_t x10 = (x6 | x9);
 uint64_t x11 = (x4 | x10);
 uint64_t x12 = (x2 | x11);
 return x12)
x
     : word64 * word64 * word64 * word64 * word64 → ReturnType uint64_t