Exits with exec syscall "errno" (if available)

src/main.rs

@@ -82,5 +82,10 @@ fn main() {
         .env_remove(DEFAULT_WRITE_STYLE_ENV)
         .exec();
     error!("Error while executing {:?}: {}", args.arguments, error);
-    process::exit(1);
+
+    process::exit(if let Some(raw_os_error) = error.raw_os_error() {
+        raw_os_error
+    } else {
+        1
+    });
 }