Function extern_spec_T_Option_T_map_or 

pub fn extern_spec_T_Option_T_map_or<T, U, F: FnOnce(T) -> U>(
    self_: Option<T>,
    default: U,
    f: F,
) -> U

extern spec for Option<T>::map_or

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

requires

self

ensures

self