Function extern_spec_T_E_Result_T_E_ok 

pub fn extern_spec_T_E_Result_T_E_ok<T, E>(self_: Result<T, E>) -> Option<T>

extern spec for Result<T, E>::ok

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

terminates

ghost

ensures

forall<t: T> self == Ok(t) ==> result == Some(t)

ensures

(exists<e: E> self == Err(e)) ==> result == None