λ x x0 : word64 * word64 * word64 * word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x12, x13, x11, x9, x7, x5, (x22, x23, x21, x19, x17, x15))%core,
 ((x12 + x22), (x13 + x23), (x11 + x21), (x9 + x19), (x7 + x17), (x5 + x15)))
(x, x0)%core
     : word64 * word64 * word64 * word64 * word64 * word64 → word64 * word64 * word64 * word64 * word64 * word64 → ReturnType (uint64_t * uint64_t * uint64_t * uint64_t * uint64_t * uint64_t)