Function extern_spec_std_option_T_Option_T_unwrap 

pub fn extern_spec_std_option_T_Option_T_unwrap<T>(self_: Option<T>) -> T

extern spec for ::std::option::Option<T>::unwrap

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

terminates

ghost

requires

self != None

ensures

Some(result) == self