diff --git a/src/librust/rust.rc b/src/librust/rust.rc
index 21f944d2af1..f0d4652eb1d 100644
--- a/src/librust/rust.rc
+++ b/src/librust/rust.rc
@@ -36,7 +36,6 @@ use core::io;
 use core::os;
 use core::run;
 use core::libc::exit;
-use core::str;
 
 // For bootstrapping.
 mod std {
diff --git a/src/librustdoc/attr_parser.rs b/src/librustdoc/attr_parser.rs
index 47c54ee8e8f..026f57df035 100644
--- a/src/librustdoc/attr_parser.rs
+++ b/src/librustdoc/attr_parser.rs
@@ -17,7 +17,6 @@ an AST's attributes.
 
 use core::prelude::*;
 
-use core::str;
 use syntax::ast;
 use syntax::attr;
 
diff --git a/src/librustdoc/escape_pass.rs b/src/librustdoc/escape_pass.rs
index ef07bdfca16..2f09e0a5ddc 100644
--- a/src/librustdoc/escape_pass.rs
+++ b/src/librustdoc/escape_pass.rs
@@ -13,8 +13,6 @@
 use pass::Pass;
 use text_pass;
 
-use core::str;
-
 pub fn mk_pass() -> Pass {
     text_pass::mk_pass(~"escape", escape)
 }
diff --git a/src/librustdoc/markdown_index_pass.rs b/src/librustdoc/markdown_index_pass.rs
index e7def3ebb9b..3634155b8a3 100644
--- a/src/librustdoc/markdown_index_pass.rs
+++ b/src/librustdoc/markdown_index_pass.rs
@@ -22,8 +22,6 @@ use markdown_pass;
 use markdown_writer;
 use pass::Pass;
 
-use core::str;
-
 pub fn mk_pass(config: config::Config) -> Pass {
     Pass {
         name: ~"markdown_index",
diff --git a/src/librustpkg/package_path.rs b/src/librustpkg/package_path.rs
index 0216b032a6d..161634be650 100644
--- a/src/librustpkg/package_path.rs
+++ b/src/librustpkg/package_path.rs
@@ -12,7 +12,7 @@
 
 use core::path::Path;
 use core::option::Some;
-use core::{hash, str};
+use core::hash;
 use core::rt::io::Writer;
 use core::hash::Streaming;
 
diff --git a/src/librustpkg/package_source.rs b/src/librustpkg/package_source.rs
index a4a392e4bbb..6d8a6095ca4 100644
--- a/src/librustpkg/package_source.rs
+++ b/src/librustpkg/package_source.rs
@@ -183,7 +183,7 @@ impl PkgSrc {
         if self.libs.is_empty() && self.mains.is_empty()
             && self.tests.is_empty() && self.benchs.is_empty() {
 
-            note(~"Couldn't infer any crates to build.\n\
+            note("Couldn't infer any crates to build.\n\
                          Try naming a crate `main.rs`, `lib.rs`, \
                          `test.rs`, or `bench.rs`.");
             cond.raise(copy self.id);