Add `eprint!` and `eprintln!` macros to the prelude.

These are exactly the same as `print!` and `println!` except that
they write to stderr instead of stdout.  Issue #39228.

1 files changed, 40 insertions, 0 deletions

diff --git a/src/test/run-pass/print-stdout-eprint-stderr.rs b/src/test/run-pass/print-stdout-eprint-stderr.rs
new file mode 100644
index 00000000000..8ca6e1c6356
--- /dev/null
+++ b/src/test/run-pass/print-stdout-eprint-stderr.rs
@@ -0,0 +1,40 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(eprint)]
+
+use std::{env, process};
+
+fn child() {
+    print!("[stdout 0]");
+    print!("[stdout {}]", 1);
+    println!("[stdout {}]", 2);
+    println!();
+    eprint!("[stderr 0]");
+    eprint!("[stderr {}]", 1);
+    eprintln!("[stderr {}]", 2);
+    eprintln!();
+}
+
+fn parent() {
+    let this = env::args().next().unwrap();
+    let output = process::Command::new(this).arg("-").output().unwrap();
+    assert!(output.status.success());
+
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let stderr = String::from_utf8(output.stderr).unwrap();
+
+    assert_eq!(stdout, "[stdout 0][stdout 1][stdout 2]\n\n");
+    assert_eq!(stderr, "[stderr 0][stderr 1][stderr 2]\n\n");
+}
+
+fn main() {
+    if env::args().count() == 2 { child() } else { parent() }
+}