Function fiat_crypto::p521_64::fiat_p521_carry

pub fn fiat_p521_carry(
    out1: &mut fiat_p521_tight_field_element,
    arg1: &fiat_p521_loose_field_element
)

The function fiat_p521_carry reduces a field element.

Postconditions: eval out1 mod m = eval arg1 mod m