λ x x0 : word64 * word64 * word64 * word64 * word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x14, x15, x13, x11, x9, x7, x5, (x26, x27, x25, x23, x21, x19, x17))%core,
 ((x14 + x26), (x15 + x27), (x13 + x25), (x11 + x23), (x9 + x21), (x7 + x19), (x5 + x17)))
(x, x0)%core
     : word64 * word64 * 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 * uint64_t)