Function extern_spec_Neg_Wrapping_usize_neg 

pub fn extern_spec_Neg_Wrapping_usize_neg(
    self_: Wrapping<usize>,
) -> Wrapping<usize>

extern spec for Wrapping<usize>::neg

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

ghost

ensures

result.0 == -self.0