λ x : word64 * word64 * word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x7, x8, x6, x4, x2)%core,
 uint64_t x10, bool x11 = subborrow_u51(0x0, x2, 0x7ffffffffffed);
 uint64_t x13, bool x14 = subborrow_u51(x11, x4, 0x7ffffffffffff);
 uint64_t x16, bool x17 = subborrow_u51(x14, x6, 0x7ffffffffffff);
 uint64_t x19, bool x20 = subborrow_u51(x17, x8, 0x7ffffffffffff);
 uint64_t x22, bool x23 = subborrow_u51(x20, x7, 0x7ffffffffffff);
 uint64_t x24 = (uint64_t) (x23 == 0 ? 0x0 : 0xffffffffffffffffL);
 uint64_t x25 = x24 & 0x7ffffffffffed;
 uint64_t x27, bool x28 = addcarryx_u51(0x0, x10, x25);
 uint64_t x29 = x24 & 0x7ffffffffffff;
 uint64_t x31, bool x32 = addcarryx_u51(x28, x13, x29);
 uint64_t x33 = x24 & 0x7ffffffffffff;
 uint64_t x35, bool x36 = addcarryx_u51(x32, x16, x33);
 uint64_t x37 = x24 & 0x7ffffffffffff;
 uint64_t x39, bool x40 = addcarryx_u51(x36, x19, x37);
 uint64_t x41 = x24 & 0x7ffffffffffff;
 uint64_t x43, bool _ = addcarryx_u51(x40, x22, x41);
 (Return x43, Return x39, Return x35, Return x31, Return x27))
x
     : word64 * word64 * word64 * word64 * word64 → ReturnType (uint64_t * uint64_t * uint64_t * uint64_t * uint64_t)