src/test/ui/env-args-reverse-iterator.rs

   1 // run-pass
   2 // ignore-cloudabi no processes
   3 // ignore-emscripten no processes
   4 // ignore-sgx no processes
   5
   6 use std::env::args;
   7 use std::process::Command;
   8
   9 fn assert_reverse_iterator_for_program_arguments(program_name: &str) {
  10     let args: Vec<_> = args().rev().collect();
  11
  12     assert!(args.len() == 4);
  13     assert_eq!(args[0], "c");
  14     assert_eq!(args[1], "b");
  15     assert_eq!(args[2], "a");
  16     assert_eq!(args[3], program_name);
  17
  18     println!("passed");
  19 }
  20
  21 fn main() {
  22     let mut args = args();
  23     let me = args.next().unwrap();
  24
  25     if let Some(_) = args.next() {
  26         assert_reverse_iterator_for_program_arguments(&me);
  27         return
  28     }
  29
  30     let output = Command::new(&me)
  31         .arg("a")
  32         .arg("b")
  33         .arg("c")
  34         .output()
  35         .unwrap();
  36     assert!(output.status.success());
  37     assert!(output.stderr.is_empty());
  38     assert_eq!(output.stdout, b"passed\n");
  39 }