Rollup merge of #22567 - Gankro:unstable, r=alexcrichton

 * Adds features and allows
* Removes unused muts, unused imports, dead code
* Migrates some deprecated code to new io/env
* Changes std::num::uint/int to be re-exports of std::num::usize/isize

libcollections, liballoc, and libcoretest no longer warn during testing.

libstd warns much less, though there's some dangly bits that weren't obvious fixes. In particular, how to only supress deprecated warnings in specific submodules of std.

1 files changed, 2 insertions, 6 deletions

diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index 5baa095d359..86604f62171 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -489,18 +489,14 @@ impl Child {
 mod tests {
     use io::ErrorKind;
     use io::prelude::*;
-    use prelude::v1::{Ok, Err, range, drop, Some, None, Vec};
+    use prelude::v1::{Ok, Err, drop, Some, Vec};
     use prelude::v1::{String, Clone};
     use prelude::v1::{SliceExt, Str, StrExt, AsSlice, ToString, GenericPath};
-    use path::Path;
     use old_path;
     use old_io::fs::PathExtensions;
     use rt::running_on_valgrind;
     use str;
-    use super::{Child, Command, Output, ExitStatus, Stdio};
-    use sync::mpsc::channel;
-    use thread;
-    use time::Duration;
+    use super::{Command, Output, Stdio};
 
     // FIXME(#10380) these tests should not all be ignored on android.