diff --git a/src/librustc/back/rpath.rs b/src/librustc/back/rpath.rs
index f3e01a00e38..026b2944a62 100644
--- a/src/librustc/back/rpath.rs
+++ b/src/librustc/back/rpath.rs
@@ -195,6 +195,8 @@ pub fn minimize_rpaths(rpaths: &[Path]) -> ~[Path] {
 
 #[cfg(unix)]
 mod test {
+    use core::prelude::*;
+
     // FIXME(#2119): the outer attribute should be #[cfg(unix, test)], then
     // these redundant #[cfg(test)] blocks can be removed
     #[cfg(test)]
diff --git a/src/librustc/driver/driver.rs b/src/librustc/driver/driver.rs
index 4a9a12e7c0f..4298cb5b15b 100644
--- a/src/librustc/driver/driver.rs
+++ b/src/librustc/driver/driver.rs
@@ -920,6 +920,8 @@ pub fn list_metadata(sess: Session, path: &Path, out: @io::Writer) {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use driver::driver::{build_configuration, build_session};
     use driver::driver::{build_session_options, optgroups, str_input};
 
diff --git a/src/librustc/util/enum_set.rs b/src/librustc/util/enum_set.rs
index 048b602e818..d31d943db07 100644
--- a/src/librustc/util/enum_set.rs
+++ b/src/librustc/util/enum_set.rs
@@ -98,7 +98,10 @@ impl<E:CLike> BitAnd<EnumSet<E>, EnumSet<E>> for EnumSet<E> {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use core::iter;
+
     use util::enum_set::*;
 
     #[deriving(Eq)]
diff --git a/src/librustdoc/attr_parser.rs b/src/librustdoc/attr_parser.rs
index 92e2973acb6..99bdf228459 100644
--- a/src/librustdoc/attr_parser.rs
+++ b/src/librustdoc/attr_parser.rs
@@ -70,6 +70,7 @@ pub fn parse_hidden(attrs: ~[ast::attribute]) -> bool {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
     use syntax::ast;
     use syntax;
     use super::{parse_hidden, parse_crate, parse_desc};
diff --git a/src/librustdoc/attr_pass.rs b/src/librustdoc/attr_pass.rs
index e49e9b27d41..1e6d6d7bd89 100644
--- a/src/librustdoc/attr_pass.rs
+++ b/src/librustdoc/attr_pass.rs
@@ -234,6 +234,8 @@ fn fold_impl(
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use attr_pass::run;
     use doc;
diff --git a/src/librustdoc/config.rs b/src/librustdoc/config.rs
index 22a5f668c70..39c72686a4d 100644
--- a/src/librustdoc/config.rs
+++ b/src/librustdoc/config.rs
@@ -242,6 +242,7 @@ pub fn maybe_find_pandoc(
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
     use config::*;
     use core::run::ProgramOutput;
 
diff --git a/src/librustdoc/desc_to_brief_pass.rs b/src/librustdoc/desc_to_brief_pass.rs
index 1066f9e924a..d74be0580f4 100644
--- a/src/librustdoc/desc_to_brief_pass.rs
+++ b/src/librustdoc/desc_to_brief_pass.rs
@@ -182,6 +182,8 @@ pub fn paragraphs(s: &str) -> ~[~str] {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use attr_pass;
     use super::{extract, paragraphs, run};
diff --git a/src/librustdoc/markdown_index_pass.rs b/src/librustdoc/markdown_index_pass.rs
index 9d55452acdf..f2467d7ad22 100644
--- a/src/librustdoc/markdown_index_pass.rs
+++ b/src/librustdoc/markdown_index_pass.rs
@@ -164,6 +164,8 @@ pub fn pandoc_header_id(header: &str) -> ~str {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use attr_pass;
     use config;
diff --git a/src/librustdoc/markdown_pass.rs b/src/librustdoc/markdown_pass.rs
index ff7955768d3..e0fb88ff703 100644
--- a/src/librustdoc/markdown_pass.rs
+++ b/src/librustdoc/markdown_pass.rs
@@ -505,6 +505,8 @@ fn put_struct(
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use attr_pass;
     use config;
diff --git a/src/librustdoc/markdown_writer.rs b/src/librustdoc/markdown_writer.rs
index 5a22a56b7a6..3e90c1a53f4 100644
--- a/src/librustdoc/markdown_writer.rs
+++ b/src/librustdoc/markdown_writer.rs
@@ -261,6 +261,8 @@ fn future_writer() -> (Writer, future::Future<~str>) {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use doc;
     use extract;
diff --git a/src/librustdoc/sectionalize_pass.rs b/src/librustdoc/sectionalize_pass.rs
index 6333e287879..4220a2bef78 100644
--- a/src/librustdoc/sectionalize_pass.rs
+++ b/src/librustdoc/sectionalize_pass.rs
@@ -162,6 +162,8 @@ fn parse_header(line: ~str) -> Option<~str> {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use attr_pass;
     use doc;
diff --git a/src/librustdoc/text_pass.rs b/src/librustdoc/text_pass.rs
index e6c6118a765..61f66c43521 100644
--- a/src/librustdoc/text_pass.rs
+++ b/src/librustdoc/text_pass.rs
@@ -139,6 +139,8 @@ fn fold_impl(
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use attr_pass;
     use desc_to_brief_pass;
diff --git a/src/librustdoc/tystr_pass.rs b/src/librustdoc/tystr_pass.rs
index 941faf32d36..051825d46e1 100644
--- a/src/librustdoc/tystr_pass.rs
+++ b/src/librustdoc/tystr_pass.rs
@@ -347,6 +347,8 @@ fn strip_struct_extra_stuff(item: @ast::item) -> @ast::item {
 
 #[cfg(test)]
 mod test {
+    use core::prelude::*;
+
     use astsrv;
     use doc;
     use extract;