macro_rules! field_bits_7_limbs { ($field:ident, $modulus:ident) => { ... }; ($field:ident, $modulus:ident, $modulus_limbs_32:ident) => { ... }; }
macro_rules! field_bits_7_limbs { ($field:ident, $modulus:ident) => { ... }; ($field:ident, $modulus:ident, $modulus_limbs_32:ident) => { ... }; }