std: Remove the curious inner module

This isn't actually necessary any more with the advent of `$crate` and changes
in the compiler to expand macros to `::core::$foo` in the context of a
`#![no_std]` crate.

The libcore inner module was also trimmed down a bit to the bare bones.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstd/sync/mpsc/mod.rs b/src/libstd/sync/mpsc/mod.rs
index 1453c91fd4d..d80d858e7a9 100644
--- a/src/libstd/sync/mpsc/mod.rs
+++ b/src/libstd/sync/mpsc/mod.rs
@@ -1107,7 +1107,7 @@ impl error::Error for TryRecvError {
 mod tests {
     use prelude::v1::*;
 
-    use std::env;
+    use env;
     use super::*;
     use thread;
 
@@ -1655,7 +1655,7 @@ mod tests {
 mod sync_tests {
     use prelude::v1::*;
 
-    use std::env;
+    use env;
     use thread;
     use super::*;