Function extern_spec_T_Option_T_insert 

pub fn extern_spec_T_Option_T_insert<T>(
    self_: &mut Option<T>,
    value: T,
) -> &mut T

extern spec for Option<T>::insert

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

terminates

ghost

ensures

match *self { Some(t) => resolve(t), None => true }

ensures

*result == value && ^self == Some(^result)