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#![feature(termination_trait_lib)] #![feature(try_trait)] use std::process::Termination; use std::fmt::Debug; use std::ops::Try; pub enum Exit<T> { Ok, Err(T) } impl<T: Into<i32> + Debug> Termination for Exit<T> { fn report(self) -> i32 { match self { Exit::Ok => 0, Exit::Err(err) => { eprintln!("Error: {:?}", err); err.into() }, } } } impl<T> Try for Exit<T> { type Ok = (); type Error = T; fn into_result(self) -> Result<Self::Ok, Self::Error> { match self { Exit::Ok => Ok(()), Exit::Err(err) => Err(err) } } fn from_error(err: Self::Error) -> Self { Exit::Err(err) } fn from_ok(_: Self::Ok) -> Self { Exit::Ok } }