Function extern_spec_T_Option_T_as_ref 

pub fn extern_spec_T_Option_T_as_ref<T>(self_: &Option<T>) -> Option<&T>

extern spec for Option<T>::as_ref

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

terminates

ghost

ensures

*self == None ==> result == None

ensures

*self == None || exists<r: &T> result == Some(r) && *self == Some(*r)