6 files changed, 1 insertions, 21 deletions
diff --git a/src/bootstrap/bin/main.rs b/src/bootstrap/bin/main.rs
index 8ddce5c247d..0732cb83f39 100644
--- a/src/bootstrap/bin/main.rs
+++ b/src/bootstrap/bin/main.rs
@@ -7,8 +7,6 @@
 
 #![deny(warnings)]
 
-extern crate bootstrap;
-
 use std::env;
 
 use bootstrap::{Config, Build};
diff --git a/src/bootstrap/bin/rustc.rs b/src/bootstrap/bin/rustc.rs
index 7a765973e20..b6afe317a07 100644
--- a/src/bootstrap/bin/rustc.rs
+++ b/src/bootstrap/bin/rustc.rs
@@ -17,8 +17,6 @@
 
 #![deny(warnings)]
 
-extern crate bootstrap;
-
 use std::env;
 use std::ffi::OsString;
 use std::io;
diff --git a/src/bootstrap/bin/rustdoc.rs b/src/bootstrap/bin/rustdoc.rs
index aeb15821b0b..36beec3a944 100644
--- a/src/bootstrap/bin/rustdoc.rs
+++ b/src/bootstrap/bin/rustdoc.rs
@@ -4,8 +4,6 @@
 
 #![deny(warnings)]
 
-extern crate bootstrap;
-
 use std::env;
 use std::process::Command;
 use std::path::PathBuf;
diff --git a/src/bootstrap/bin/sccache-plus-cl.rs b/src/bootstrap/bin/sccache-plus-cl.rs
index f9e14d1ff6d..f40eec83ddf 100644
--- a/src/bootstrap/bin/sccache-plus-cl.rs
+++ b/src/bootstrap/bin/sccache-plus-cl.rs
@@ -1,5 +1,3 @@
-extern crate cc;
-
 use std::env;
 use std::process::{self, Command};
 
diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 9d037dad9cc..c94d6cb4c1f 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -326,7 +326,7 @@ pub enum Kind {
 impl<'a> Builder<'a> {
     fn get_step_descriptions(kind: Kind) -> Vec<StepDescription> {
         macro_rules! describe {
-            ($($rule:ty),+ $(,)*) => {{
+            ($($rule:ty),+ $(,)?) => {{
                 vec![$(StepDescription::from::<$rule>()),+]
             }};
         }
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 6a93c95c3d9..2dceb30c4ad 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -114,23 +114,11 @@ extern crate build_helper;
 extern crate serde_derive;
 #[macro_use]
 extern crate lazy_static;
-extern crate serde_json;
-extern crate cmake;
-extern crate filetime;
-extern crate cc;
-extern crate getopts;
-extern crate num_cpus;
-extern crate toml;
-extern crate time;
-extern crate petgraph;
 
 #[cfg(test)]
 #[macro_use]
 extern crate pretty_assertions;
 
-#[cfg(unix)]
-extern crate libc;
-
 use std::cell::{RefCell, Cell};
 use std::collections::{HashSet, HashMap};
 use std::env;