diff --git a/src/libcollections/slice.rs b/src/libcollections/slice.rs
index d6d94f57acf..cca071836dd 100644
--- a/src/libcollections/slice.rs
+++ b/src/libcollections/slice.rs
@@ -1343,7 +1343,10 @@ pub mod raw {
 #[cfg(test)]
 mod tests {
     use std::boxed::Box;
-    use prelude::*;
+    use prelude::{Some, None, range, Vec, ToString, Clone, Greater, Less, Equal};
+    use prelude::{SliceExt, Iterator, IteratorExt, DoubleEndedIteratorExt};
+    use prelude::{OrdSliceExt, CloneSliceExt, PartialEqSliceExt, AsSlice};
+    use prelude::{RandomAccessIterator, Ord, VectorVector};
     use core::cell::Cell;
     use core::default::Default;
     use core::mem;
diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index bccd2a1198a..5b26dc29478 100644
--- a/src/libcollections/str.rs
+++ b/src/libcollections/str.rs
@@ -3331,7 +3331,7 @@ mod tests {
 #[cfg(test)]
 mod bench {
     use super::*;
-    use prelude::*;
+    use prelude::{SliceExt, IteratorExt, DoubleEndedIteratorExt};
     use test::Bencher;
     use test::black_box;
 
diff --git a/src/libstd/c_str.rs b/src/libstd/c_str.rs
index ffe19203769..39c57b99b36 100644
--- a/src/libstd/c_str.rs
+++ b/src/libstd/c_str.rs
@@ -537,7 +537,8 @@ pub unsafe fn from_c_multistring<F>(buf: *const libc::c_char,
 #[cfg(test)]
 mod tests {
     use super::*;
-    use prelude::*;
+    use prelude::{spawn, Some, None, Option, FnOnce, ToString, CloneSliceExt};
+    use prelude::{Clone, RawPtr, Iterator, SliceExt, StrExt};
     use ptr;
     use thread::Thread;
     use libc;
diff --git a/src/libstd/comm/mod.rs b/src/libstd/comm/mod.rs
index 4b0b21ec8d8..a405627aecc 100644
--- a/src/libstd/comm/mod.rs
+++ b/src/libstd/comm/mod.rs
@@ -336,7 +336,8 @@ macro_rules! test {
             use super::*;
             use comm::*;
             use thread::Thread;
-            use prelude::*;
+            use prelude::{Ok, Err, spawn, range, drop, Box, Some, None, Option};
+            use prelude::{Vec, Buffer, from_str, Clone};
 
             $(#[$a])* #[test] fn f() { $b }
         }
@@ -1046,7 +1047,7 @@ unsafe impl<T> kinds::Sync for RacyCell<T> { } // Oh dear
 #[cfg(test)]
 mod test {
     use super::*;
-    use prelude::*;
+    use prelude::{spawn, range, Some, None, from_str, Clone, Str};
     use os;
 
     pub fn stress_factor() -> uint {
diff --git a/src/libstd/io/mem.rs b/src/libstd/io/mem.rs
index 01151059530..ccece874ce7 100644
--- a/src/libstd/io/mem.rs
+++ b/src/libstd/io/mem.rs
@@ -400,8 +400,8 @@ impl<'a> Buffer for BufReader<'a> {
 mod test {
     extern crate "test" as test_crate;
     use super::*;
-    use io::*;
-    use prelude::*;
+    use io::{SeekSet, SeekCur, SeekEnd, Reader, Writer, Seek};
+    use prelude::{Ok, Err, range,  Vec, Buffer,  AsSlice, SliceExt, IteratorExt, CloneSliceExt};
     use io;
     use self::test_crate::Bencher;
 
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index b6f8bb25b65..82aa00dc98e 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -1959,8 +1959,8 @@ impl fmt::Show for FilePermission {
 #[cfg(test)]
 mod tests {
     use self::BadReaderBehavior::*;
-    use super::{IoResult, Reader, MemReader, NoProgress, InvalidInput};
-    use prelude::*;
+    use super::{IoResult, Reader, MemReader, NoProgress, InvalidInput, Writer};
+    use prelude::{Ok, Vec, Buffer, CloneSliceExt};
     use uint;
 
     #[deriving(Clone, PartialEq, Show)]
diff --git a/src/libstd/io/net/pipe.rs b/src/libstd/io/net/pipe.rs
index 4afc72cde71..93f37a8c98f 100644
--- a/src/libstd/io/net/pipe.rs
+++ b/src/libstd/io/net/pipe.rs
@@ -269,7 +269,7 @@ mod tests {
     use super::*;
     use io::*;
     use io::test::*;
-    use prelude::*;
+    use prelude::{Ok, Err, spawn, range, drop,  Some, None, channel, Send, FnOnce, Clone};
     use io::fs::PathExtensions;
     use time::Duration;
 
diff --git a/src/libstd/io/net/tcp.rs b/src/libstd/io/net/tcp.rs
index 6adb5387f2e..24cf06973cc 100644
--- a/src/libstd/io/net/tcp.rs
+++ b/src/libstd/io/net/tcp.rs
@@ -484,9 +484,12 @@ impl sys_common::AsInner<TcpAcceptorImp> for TcpAcceptor {
 mod test {
     use io::net::tcp::*;
     use io::net::ip::*;
-    use io::*;
+    use io::{EndOfFile, TimedOut, IoError, ShortWrite, OtherIoError, ConnectionAborted};
+    use io::{ConnectionRefused, ConnectionReset, BrokenPipe, NotConnected};
+    use io::{PermissionDenied, Listener, Acceptor};
     use io::test::*;
-    use prelude::*;
+    use prelude::{Ok, Err, spawn, range, drop, Some, None, channel, Clone};
+    use prelude::{Reader, Writer, IteratorExt};
 
     // FIXME #11530 this fails on android because tests are run as root
     #[cfg_attr(any(windows, target_os = "android"), ignore)]
diff --git a/src/libstd/io/net/udp.rs b/src/libstd/io/net/udp.rs
index a36703172c3..a165232c5f5 100644
--- a/src/libstd/io/net/udp.rs
+++ b/src/libstd/io/net/udp.rs
@@ -250,9 +250,9 @@ impl Writer for UdpStream {
 mod test {
     use super::*;
     use io::net::ip::*;
-    use io::*;
+    use io::{ShortWrite, IoError, TimedOut, PermissionDenied};
     use io::test::*;
-    use prelude::*;
+    use prelude::{Ok, Err, spawn, range, drop, Some, None, channel, Clone, Reader, Writer};
 
     // FIXME #11530 this fails on android because tests are run as root
     #[cfg_attr(any(windows, target_os = "android"), ignore)]
diff --git a/src/libstd/io/process.rs b/src/libstd/io/process.rs
index 93aa627ffba..9e0c76e4e79 100644
--- a/src/libstd/io/process.rs
+++ b/src/libstd/io/process.rs
@@ -745,8 +745,10 @@ mod tests {
 
     use super::*;
     use io::timer::*;
-    use io::*;
-    use prelude::*;
+    use io::{Truncate, Write, TimedOut, timer, process, FileNotFound};
+    use prelude::{Ok, Err, spawn, range, drop, Box, Some, None, Option, Vec, Buffer};
+    use prelude::{from_str, Path, String, channel, Reader, Writer, Clone, Slice};
+    use prelude::{SliceExt, Str, StrExt, AsSlice, ToString, GenericPath};
     use io::fs::PathExtensions;
     use time::Duration;
     use str;
diff --git a/src/libstd/io/util.rs b/src/libstd/io/util.rs
index 18fabcbd1a2..79a2b8b84f0 100644
--- a/src/libstd/io/util.rs
+++ b/src/libstd/io/util.rs
@@ -280,7 +280,7 @@ mod test {
     use io;
     use boxed::Box;
     use super::*;
-    use prelude::*;
+    use prelude::{Ok, range, Vec, Buffer, Writer, Reader, ToString, AsSlice};
 
     #[test]
     fn test_limit_reader_unlimited() {
diff --git a/src/libstd/num/mod.rs b/src/libstd/num/mod.rs
index 7c8763979bb..48ff1a364e9 100644
--- a/src/libstd/num/mod.rs
+++ b/src/libstd/num/mod.rs
@@ -147,8 +147,10 @@ pub fn test_num<T>(ten: T, two: T) where
 
 #[cfg(test)]
 mod tests {
-    use prelude::*;
-    use super::*;
+    use prelude::{range, Some, None, Option, IteratorExt};
+    use super::{from_int, from_uint, from_i32, from_i64, from_u64, from_u32};
+    use super::{from_f64, from_f32, from_u16, from_i16, from_u8, from_i8, Int};
+    use super::{cast, NumCast, ToPrimitive, FromPrimitive, UnsignedInt};
     use i8;
     use i16;
     use i32;
diff --git a/src/libstd/path/posix.rs b/src/libstd/path/posix.rs
index d941665f048..60f147eac9b 100644
--- a/src/libstd/path/posix.rs
+++ b/src/libstd/path/posix.rs
@@ -1239,7 +1239,7 @@ mod bench {
     extern crate test;
     use self::test::Bencher;
     use super::*;
-    use prelude::*;
+    use prelude::{Clone, GenericPath};
 
     #[bench]
     fn join_home_dir(b: &mut Bencher) {
diff --git a/src/libstd/sync/atomic.rs b/src/libstd/sync/atomic.rs
index 26778ef70b3..bdf947438f3 100644
--- a/src/libstd/sync/atomic.rs
+++ b/src/libstd/sync/atomic.rs
@@ -180,7 +180,7 @@ impl<T: Send> Drop for AtomicOption<T> {
 
 #[cfg(test)]
 mod test {
-    use prelude::*;
+    use prelude::{Some, None};
     use super::*;
 
     #[test]