Function extern_spec_Neg_Wrapping_isize_neg 

pub fn extern_spec_Neg_Wrapping_isize_neg(
    self_: Wrapping<isize>,
) -> Wrapping<isize>

extern spec for Wrapping<isize>::neg

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

ghost

ensures

result.0 == -self.0