λ x : word64 * word64 * word64 * word64 * word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x11, x12, x10, x8, x6, x4, x2)%core,
 uint64_t x13 = (x12 | x11);
 uint64_t x14 = (x10 | x13);
 uint64_t x15 = (x8 | x14);
 uint64_t x16 = (x6 | x15);
 uint64_t x17 = (x4 | x16);
 uint64_t x18 = (x2 | x17);
 return x18)
x
     : word64 * word64 * word64 * word64 * word64 * word64 * word64 → ReturnType uint64_t