diff --git a/src/etc/rustup.sh b/src/etc/rustup.sh
index 85e15e363271b..b41d3db22e49e 100755
--- a/src/etc/rustup.sh
+++ b/src/etc/rustup.sh
@@ -230,7 +230,7 @@ validate_opt() {
 }
 
 create_tmp_dir() {
-    local TMP_DIR=./rustup-tmp-install
+    local TMP_DIR=`pwd`/rustup-tmp-install
 
     rm -Rf "${TMP_DIR}"
     need_ok "failed to remove temporary installation directory"
@@ -245,6 +245,21 @@ probe_need CFG_CURL  curl
 probe_need CFG_TAR   tar
 probe_need CFG_FILE  file
 
+probe CFG_SHA256SUM sha256sum
+probe CFG_SHASUM shasum
+
+if [ -z "$CFG_SHA256SUM" -a -z "$CFG_SHASUM" ]; then
+    err "unable to find either sha256sum or shasum"
+fi
+
+calculate_hash() {
+    if [ -n "$CFG_SHA256SUM" ]; then
+        ${CFG_SHA256SUM} $@
+    else
+        ${CFG_SHASUM} -a 256 $@
+    fi
+}
+
 CFG_SRC_DIR="$(cd $(dirname $0) && pwd)/"
 CFG_SELF="$0"
 CFG_ARGS="$@"
@@ -270,6 +285,10 @@ VAL_OPTIONS=""
 flag uninstall "only uninstall from the installation prefix"
 valopt prefix "" "set installation prefix"
 opt cargo 1 "install cargo with rust"
+valopt date "" "use the YYYY-MM-DD nightly instead of the current nightly"
+valopt rust-date "" "use the YYYY-MM-DD rust nightly instead of the current nightly"
+valopt cargo-date "" "use the YYYY-MM-DD cargo nightly instead of the current nightly"
+flag save "save the downloaded nightlies to ~/.rustup"
 
 if [ $HELP -eq 1 ]
 then
@@ -417,6 +436,21 @@ CFG_TMP_DIR=$(mktemp -d 2>/dev/null \
            || mktemp -d -t 'rustup-tmp-install' 2>/dev/null \
            || create_tmp_dir)
 
+# If we're saving nightlies and we didn't specify which one, grab todays.
+# Otherwise we'll use the latest version.
+if [ -n "${CFG_SAVE}" -a -z "${CFG_DATE}" ];
+then
+    CFG_DATE=`date "+%Y-%m-%d"`
+fi
+
+if [ -z "${CFG_RUST_DATE}" ]; then
+    CFG_RUST_DATE="${CFG_DATE}"
+fi
+
+if [ -z "${CFG_CARGO_DATE}" ]; then
+    CFG_CARGO_DATE="${CFG_DATE}"
+fi
+
 RUST_URL="https://static.rust-lang.org/dist"
 RUST_PACKAGE_NAME=rust-nightly
 RUST_PACKAGE_NAME_AND_TRIPLE="${RUST_PACKAGE_NAME}-${HOST_TRIPLE}"
@@ -431,28 +465,86 @@ CARGO_TARBALL_NAME="${CARGO_PACKAGE_NAME_AND_TRIPLE}.tar.gz"
 CARGO_LOCAL_INSTALL_DIR="${CFG_TMP_DIR}/${CARGO_PACKAGE_NAME_AND_TRIPLE}"
 CARGO_LOCAL_INSTALL_SCRIPT="${CARGO_LOCAL_INSTALL_DIR}/install.sh"
 
-# Fetch the package.
+# add a date suffix if we want a particular nighly.
+if [ -n "${CFG_RUST_DATE}" ];
+then
+    RUST_URL="${RUST_URL}/${CFG_RUST_DATE}"
+fi
+
+if [ -n "${CFG_CARGO_DATE}" ];
+then
+    CARGO_URL="${CARGO_URL}/${CFG_CARGO_DATE}"
+fi
+
+verify_hash() {
+    remote_sha256="$1"
+    local_file="$2"
+
+    msg "Downloading ${remote_sha256}"
+    remote_sha256=`"${CFG_CURL}" -f "${remote_sha256}"`
+    if [ "$?" -ne 0 ]; then
+        rm -Rf "${CFG_TMP_DIR}"
+        err "Failed to download ${remote_url}"
+    fi
+
+    msg "Verifying hash"
+    local_sha256=$(calculate_hash "${local_file}")
+    if [ "$?" -ne 0 ]; then
+        rm -Rf "${CFG_TMP_DIR}"
+        err "Failed to compute hash for ${local_tarball}"
+    fi
+
+    # We only need the sha, not the filenames
+    remote_sha256=`echo ${remote_sha256} | cut -f 1 -d ' '`
+    local_sha256=`echo ${local_sha256} | cut -f 1 -d ' '`
+
+    if [ "${remote_sha256}" != "${local_sha256}" ]; then
+        rm -Rf "${CFG_TMP_DIR}"
+        err "invalid sha256.\n  ${remote_sha256}\t${remote_tarball}\n  ${local_sha256}\t${local_tarball}"
+    fi
+}
+
+# Fetch the package. Optionally caches the tarballs.
 download_package() {
     remote_tarball="$1"
     local_tarball="$2"
+    remote_sha256="${remote_tarball}.sha256"
 
-    msg "Downloading ${remote_tarball} to ${local_tarball}"
+    # Check if we've already downloaded this file.
+    if [ -e "${local_tarball}.tmp" ]; then
+        msg "Resuming ${remote_tarball} to ${local_tarball}"
 
-    "${CFG_CURL}" -f -o "${local_tarball}" "${remote_tarball}"
-    if [ $? -ne 0 ]
-    then
-        rm -Rf "${CFG_TMP_DIR}"
-        err "failed to download installer"
+        "${CFG_CURL}" -f -C - -o "${local_tarball}.tmp" "${remote_tarball}"
+        if [ $? -ne 0 ]
+        then
+            rm -Rf "${CFG_TMP_DIR}"
+            err "failed to download installer"
+        fi
+
+        mv "${local_tarball}.tmp" "${local_tarball}"
+    elif [ ! -e "${local_tarball}" ]; then
+        msg "Downloading ${remote_tarball} to ${local_tarball}"
+
+        "${CFG_CURL}" -f -o "${local_tarball}.tmp" "${remote_tarball}"
+        if [ $? -ne 0 ]
+        then
+            rm -Rf "${CFG_TMP_DIR}"
+            err "failed to download installer"
+        fi
+
+        mv "${local_tarball}.tmp" "${local_tarball}"
     fi
+
+    verify_hash "${remote_sha256}" "${local_tarball}"
 }
 
 # Wrap all the commands needed to install a package.
 install_package() {
-    tarball_name="$1"
+    local_tarball="$1"
     install_script="$2"
 
-    msg "Extracting ${tarball_name}"
-    (cd "${CFG_TMP_DIR}" && "${CFG_TAR}" -xzf "${tarball_name}")
+    msg "Extracting ${local_tarball}"
+    (cd "${CFG_TMP_DIR}" && "${CFG_TAR}" -xvf "${local_tarball}")
     if [ $? -ne 0 ]; then
         rm -Rf "${CFG_TMP_DIR}"
         err "failed to unpack installer"
@@ -479,8 +571,24 @@ install_packages() {
     mkdir -p "${CFG_TMP_DIR}"
     need_ok "failed to create create temporary installation directory"
 
-    RUST_LOCAL_TARBALL="${CFG_TMP_DIR}/${RUST_TARBALL_NAME}"
-    CARGO_LOCAL_TARBALL="${CFG_TMP_DIR}/${CARGO_TARBALL_NAME}"
+    # If we're saving our nightlies, put them in $HOME/.rustup.
+    if [ -n "${CFG_SAVE}" ]
+    then
+        RUST_DOWNLOAD_DIR="${HOME}/.rustup/${CFG_RUST_DATE}"
+        CARGO_DOWNLOAD_DIR="${HOME}/.rustup/${CFG_CARGO_DATE}"
+    else
+        RUST_DOWNLOAD_DIR="${CFG_TMP_DIR}"
+        CARGO_DOWNLOAD_DIR="${CFG_TMP_DIR}"
+    fi
+
+    mkdir -p "${RUST_DOWNLOAD_DIR}"
+    need_ok "failed to create create download directory"
+
+    mkdir -p "${CARGO_DOWNLOAD_DIR}"
+    need_ok "failed to create create download directory"
+
+    RUST_LOCAL_TARBALL="${RUST_DOWNLOAD_DIR}/${RUST_TARBALL_NAME}"
+    CARGO_LOCAL_TARBALL="${CARGO_DOWNLOAD_DIR}/${CARGO_TARBALL_NAME}"
 
     download_package \
         "${RUST_URL}/${RUST_TARBALL_NAME}" \
@@ -493,12 +601,12 @@ install_packages() {
     fi
 
     install_package \
-        "${RUST_TARBALL_NAME}" \
+        "${RUST_LOCAL_TARBALL}" \
         "${RUST_LOCAL_INSTALL_SCRIPT}"
 
     if [ -z "${CFG_DISABLE_CARGO}" ]; then
         install_package \
-            "${CARGO_TARBALL_NAME}" \
+            "${CARGO_LOCAL_TARBALL}" \
             "${CARGO_LOCAL_INSTALL_SCRIPT}"
     fi
 
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 0c8c17b080bf3..4dee6e8d66e27 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -983,7 +983,7 @@ impl LitIntType {
 #[deriving(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
 pub enum Lit_ {
     LitStr(InternedString, StrStyle),
-    LitBinary(Rc<Vec<u8> >),
+    LitBinary(Rc<Vec<u8>>),
     LitByte(u8),
     LitChar(char),
     LitInt(u64, LitIntType),