diff --git a/src/header/common/cookie.rs b/src/header/common/cookie.rs
index 46b53d82..09c8b146 100644
--- a/src/header/common/cookie.rs
+++ b/src/header/common/cookie.rs
@@ -16,6 +16,10 @@ use cookie::CookieJar;
 #[deriving(Clone, PartialEq, Show)]
 pub struct Cookies(pub Vec<Cookie>);
 
+//TODO: remove when fixed in libstd
+unsafe impl Send for Cookies {}
+unsafe impl Sync for Cookies {}
+
 deref!(Cookies -> Vec<Cookie>);
 
 impl Header for Cookies {
diff --git a/src/header/common/set_cookie.rs b/src/header/common/set_cookie.rs
index faa50f51..d861624e 100644
--- a/src/header/common/set_cookie.rs
+++ b/src/header/common/set_cookie.rs
@@ -13,6 +13,10 @@ use cookie::CookieJar;
 #[deriving(Clone, PartialEq, Show)]
 pub struct SetCookie(pub Vec<Cookie>);
 
+//TODO: remove when fixed in libstd
+unsafe impl Send for SetCookie {}
+unsafe impl Sync for SetCookie {}
+
 deref!(SetCookie -> Vec<Cookie>);
 
 impl Header for SetCookie {
diff --git a/src/header/mod.rs b/src/header/mod.rs
index 1c5c2216..93d384fd 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -5,7 +5,7 @@
 //! must implement the `Header` trait from this module. Several common headers
 //! are already provided, such as `Host`, `ContentType`, `UserAgent`, and others.
 use std::any::Any;
-use std::ascii::{AsciiExt, AsciiCast};
+use std::ascii::AsciiExt;
 use std::borrow::Cow::{Borrowed, Owned};
 use std::fmt::{mod, Show};
 use std::intrinsics::TypeId;
@@ -127,7 +127,7 @@ impl Headers {
         loop {
             match try!(http::read_header(rdr)) {
                 Some((name, value)) => {
-                    debug!("raw header: {}={}", name, value[].to_ascii());
+                    debug!("raw header: {}={}", name, value[]);
                     let name = CaseInsensitive(Owned(name));
                     let mut item = match headers.data.entry(name) {
                         Entry::Vacant(entry) => entry.set(MuCell::new(Item::raw(vec![]))),
@@ -488,7 +488,7 @@ impl<H: hash::Writer> hash::Hash<H> for CaseInsensitive {
     #[inline]
     fn hash(&self, hasher: &mut H) {
         for b in self.as_slice().bytes() {
-            hasher.write(&[b.to_ascii().to_lowercase().as_byte()])
+            hasher.write(&[b.to_ascii_lowercase()])
         }
     }
 }
diff --git a/src/http.rs b/src/http.rs
index aa869069..bc36e8c1 100644
--- a/src/http.rs
+++ b/src/http.rs
@@ -376,8 +376,6 @@ pub fn read_method<R: Reader>(stream: &mut R) -> HttpResult<method::Method> {
         return Err(HttpMethodError);
     }
 
-    debug!("method buf = {}", buf[].to_ascii());
-
     let maybe_method = match buf[0..7] {
         b"GET    " => Some(method::Method::Get),
         b"PUT    " => Some(method::Method::Put),
@@ -548,8 +546,6 @@ pub fn read_header<R: Reader>(stream: &mut R) -> HttpResult<Option<RawHeaderLine
     let real_len = value.len() - value.iter().rev().take_while(|&&x| b' ' == x).count();
     value.truncate(real_len);
 
-    debug!("header value = {}", value[].to_ascii());
-
     match try!(stream.read_byte()) {
         LF => Ok(Some((name, value))),
         _ => Err(HttpHeaderError)
diff --git a/src/lib.rs b/src/lib.rs
index 5b4c0e9a..27eec2ec 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -154,7 +154,7 @@ use self::HttpError::{HttpMethodError, HttpUriError, HttpVersionError,
 
 macro_rules! todo(
     ($($arg:tt)*) => (if cfg!(not(ndebug)) {
-        format_args!(|args| log!(5, "TODO: {}", args), $($arg)*)
+        log!(5, "TODO: {}", format_args!($($arg)*))
     })
 );
 
@@ -170,7 +170,7 @@ impl fmt::Show for Trace {
 
 macro_rules! trace(
     ($($arg:tt)*) => (if cfg!(not(ndebug)) {
-        format_args!(|args| log!(5, "{}\n{}", args, ::Trace), $($arg)*)
+        log!(5, "{}\n{}", format_args!($($arg)*), ::Trace)
     })
 );