Add a b'x' byte literal of type u8.

src/test/compile-fail/byte-literals.rs

@@ -0,0 +1,25 @@
+// Copyright 2014 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.
+
+
+// ignore-tidy-tab
+
+static FOO: u8 = b'\f';  //~ ERROR unknown byte escape
+
+pub fn main() {
+    b'\f';  //~ ERROR unknown byte escape
+    b'\x0Z';  //~ ERROR illegal character in numeric character escape: Z
+    b'	';  //~ ERROR byte constant must be escaped
+    b''';  //~ ERROR byte constant must be escaped
+    b'é';  //~ ERROR byte constant must be ASCII
+    b'a  //~ ERROR unterminated byte constant
+}
+
+

src/test/compile-fail/concat.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 fn main() {
+    concat!(b'f');  //~ ERROR: cannot concatenate a binary literal
     concat!(foo);   //~ ERROR: expected a literal
     concat!(foo()); //~ ERROR: expected a literal
 }

src/test/run-pass/byte-literals.rs

@@ -0,0 +1,38 @@
+// Copyright 2014 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.
+
+
+static FOO: u8 = b'\xF0';
+
+pub fn main() {
+    assert_eq!(b'a', 97u8);
+    assert_eq!(b'\n', 10u8);
+    assert_eq!(b'\r', 13u8);
+    assert_eq!(b'\t', 9u8);
+    assert_eq!(b'\\', 92u8);
+    assert_eq!(b'\'', 39u8);
+    assert_eq!(b'\"', 34u8);
+    assert_eq!(b'\0', 0u8);
+    assert_eq!(b'\xF0', 240u8);
+    assert_eq!(FOO, 240u8);
+
+    // FIXME: Do we want this to be valid?
+    assert_eq!([42, ..b'\t'].as_slice(), &[42, 42, 42, 42, 42, 42, 42, 42, 42]);
+
+    match 42 {
+        b'*' => {},
+        _ => fail!()
+    }
+
+    match 100 {
+        b'a' .. b'z' => {},
+        _ => fail!()
+    }
+}