λ x : word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x3, x4, x2)%core,
 uint64_t x5 = (x4 | x3);
 uint64_t x6 = (x2 | x5);
 return x6)
x
     : word64 * word64 * word64 → ReturnType uint64_t