Do not use feature exit_status

examples/extract.rs

@@ -1,17 +1,18 @@
-#![feature(exit_status)]
-
 extern crate zip;
 
 use std::io;
 use std::fs;
 
-fn main()
+fn main() {
+    std::process::exit(real_main());
+}
+
+fn real_main() -> i32
 {
     let args: Vec<_> = std::env::args().collect();
     if args.len() < 2 {
         println!("Usage: {} <filename>", args[0]);
-        std::env::set_exit_status(1);
-        return;
+        return 1;
     }
     let fname = std::path::Path::new(&*args[1]);
     let file = fs::File::open(&fname).unwrap();
@@ -38,6 +39,8 @@ fn main()
             write_file(&mut file, &outpath);
         }
     }
+
+    return 0;
 }
 
 fn write_file(reader: &mut zip::read::ZipFile, outpath: &std::path::Path)

examples/extract_lorem.rs

@@ -1,16 +1,18 @@
-#![feature(exit_status)]
-
 use std::io::prelude::*;
 
 extern crate zip;
 
 fn main()
+{
+    std::process::exit(real_main());
+}
+
+fn real_main() -> i32
 {
     let args: Vec<_> = std::env::args().collect();
     if args.len() < 2 {
         println!("Usage: {} <filename>", args[0]);
-        std::env::set_exit_status(1);
-        return;
+        return 1;
     }
     let fname = std::path::Path::new(&*args[1]);
     let zipfile = std::fs::File::open(&fname).unwrap();
@@ -20,10 +22,12 @@ fn main()
     let mut file = match archive.by_name("test/lorem_ipsum.txt")
     {
         Ok(file) => file,
-        Err(..) => { println!("File test/lorem_ipsum.txt not found"); return }
+        Err(..) => { println!("File test/lorem_ipsum.txt not found"); return 2;}
     };
 
     let mut contents = String::new();
     file.read_to_string(&mut contents).unwrap();
     println!("{}", contents);
+
+    return 0;
 }

examples/write_sample.rs

@@ -1,16 +1,18 @@
-#![feature(exit_status)]
-
 use std::io::prelude::*;
 
 extern crate zip;
 
 fn main()
+{
+    std::process::exit(real_main());
+}
+
+fn real_main() -> i32
 {
     let args: Vec<_> = std::env::args().collect();
     if args.len() < 2 {
         println!("Usage: {} <filename>", args[0]);
-        std::env::set_exit_status(1);
-        return;
+        return 1;
     }
 
     let filename = &*args[1];
@@ -19,6 +21,8 @@ fn main()
         Ok(_) => println!("File written to {}", filename),
         Err(e) => println!("Error: {:?}", e),
     }
+
+    return 0;
 }
 
 fn doit(filename: &str) -> zip::result::ZipResult<()>