Function extern_spec_T_Option_T_or_else 

pub fn extern_spec_T_Option_T_or_else<T, F: FnOnce() -> Option<T>>(
    self_: Option<T>,
    f: F,
) -> Option<T>

extern spec for Option<T>::or_else

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

requires

self

ensures

self