use std::process::ExitCode::{FAILURE, SUCCESS} instead of literals

see rust-lang/rust#48711

Author: navigaid

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nothing"
-version = "0.1.4"
+version = "0.1.5"
 edition = "2021"
 description = "Probably Nothing"
 license = "MIT"

examples/main.rs

@@ -1,10 +1,17 @@
+//! $ cargo run --example main; echo $?
+//! args = Nothing
+//! 1
+//!
+//! $ cargo run --example main Probably Nothing; echo $?
+//! args = Something(["Probably", "Nothing"])
+//! 0
+//!
 use nothing::{Nothing, Probably, Something};
 
 fn get_args() -> Probably<Vec<String>> {
-    let args: Vec<String> = std::env::args().skip(1).collect();
-    match args.len() {
-        0 => Nothing,
-        _ => Something(args),
+    match std::env::args().collect::<Vec<String>>() {
+        args @ _ if args.len() > 1 => Something(args),
+        _ => Nothing,
     }
 }
 

lib.rs

@@ -1,40 +1,43 @@
-#![feature(termination_trait_lib)]
-#![feature(derive_default_enum)]
+#![feature(
+    derive_default_enum,
+    process_exitcode_placeholder,
+    termination_trait_lib
+)]
 
 //! nothing
 //! =======
-//! 
+//!
 //! [![crates.io](https://img.shields.io/crates/v/nothing.svg)](https://crates.io/crates/nothing)
 //! [![Documentation](https://docs.rs/nothing/badge.svg)](https://docs.rs/nothing)
 //! [![Build Status](https://travis-ci.org/btwiuse/nothing.svg?branch=master)](https://travis-ci.org/btwiuse/nothing)
-//! 
+//!
 //! This is my own version of [Option](https://doc.rust-lang.org/stable/std/option/enum.Option.html). Definition:
-//! 
+//!
 //! ```
 //! pub enum Probably<T> {
 //!     Nothing,
 //!     Something(T),
 //! }
 //! ```
-//! 
+//!
 //! # Why?
-//! 
+//!
 //! The point is that you can use [Probably] as the return type of your main function:
-//! 
+//!
 //! ```
 //! use nothing::{Probably, Nothing};
-//! 
+//!
 //! fn main() -> Probably<()> {
 //!     Nothing
 //! }
 //! ```
-//! 
-//! Exit code is `0` if it is [Something], `1` if [Nothing]. 
-//! 
+//!
+//! Exit code is `0` if it is [Something], `1` if [Nothing].
+//!
 //! See [./examples/main.rs](https://github.com/btwiuse/nothing/blob/master/examples/main.rs)
-//! 
+//!
 //! ![Probably::Nothing](https://i.imgur.com/AuDdbOK.png)
-//! 
+//!
 //! It's probably nothing.
 
 /// [Probably] is modelled after [Option]:
@@ -52,8 +55,8 @@ pub use Probably::{Nothing, Something};
 impl<T> std::process::Termination for Probably<T> {
     fn report(self) -> i32 {
         match self {
-            Nothing => 1,
-            _ => 0,
+            Nothing => std::process::ExitCode::FAILURE.report(),
+            _ => std::process::ExitCode::SUCCESS.report(),
         }
     }
 }