Function extern_spec_Neg_Wrapping_u128_neg 

pub fn extern_spec_Neg_Wrapping_u128_neg(
    self_: Wrapping<u128>,
) -> Wrapping<u128>

extern spec for Wrapping<u128>::neg

This is not a real function: its only use is for documentation.

ghost

ensures

result.0 == -self.0