rollup merge of #23945: pnkfelix/gate-u-negate

Feature-gate  unsigned unary negate.

Discussed in weekly meeting here: https://github.com/rust-lang/meeting-minutes/blob/master/weekly-meetings/2015-03-31.md#feature-gate--expr

and also in the internals thread here: http://internals.rust-lang.org/t/forbid-unsigned-integer/752

3 files changed, 3 insertions, 3 deletions

diff --git a/src/libstd/fs.rs b/src/libstd/fs.rs
index 4f97ae8f69b..eabc51beb12 100644
--- a/src/libstd/fs.rs
+++ b/src/libstd/fs.rs
@@ -946,7 +946,7 @@ mod tests {
             let mut read_stream = check!(File::open(filename));
             let mut read_buf = [0; 1028];
             let read_str = match check!(read_stream.read(&mut read_buf)) {
-                -1|0 => panic!("shouldn't happen"),
+                0 => panic!("shouldn't happen"),
                 n => str::from_utf8(&read_buf[..n]).unwrap().to_string()
             };
             assert_eq!(read_str, message);
diff --git a/src/libstd/old_io/fs.rs b/src/libstd/old_io/fs.rs
index bef6ea53e50..509daa46ef3 100644
--- a/src/libstd/old_io/fs.rs
+++ b/src/libstd/old_io/fs.rs
@@ -970,7 +970,7 @@ mod test {
             let mut read_stream = File::open_mode(filename, Open, Read);
             let mut read_buf = [0; 1028];
             let read_str = match check!(read_stream.read(&mut read_buf)) {
-                -1|0 => panic!("shouldn't happen"),
+                0 => panic!("shouldn't happen"),
                 n => str::from_utf8(&read_buf[..n]).unwrap().to_string()
             };
             assert_eq!(read_str, message);
diff --git a/src/libstd/rt/mod.rs b/src/libstd/rt/mod.rs
index 632d9647212..0d26206f26b 100644
--- a/src/libstd/rt/mod.rs
+++ b/src/libstd/rt/mod.rs
@@ -116,7 +116,7 @@ fn lang_start(main: *const u8, argc: isize, argv: *const *const u8) -> isize {
             use libc;
             use libc::funcs::posix01::signal::signal;
             unsafe {
-                assert!(signal(libc::SIGPIPE, libc::SIG_IGN) != -1);
+                assert!(signal(libc::SIGPIPE, libc::SIG_IGN) != !0);
             }
         }
         ignore_sigpipe();