diff --git a/src/ci/run.sh b/src/ci/run.sh
index b7e8176255997..b0e1b1651055f 100755
--- a/src/ci/run.sh
+++ b/src/ci/run.sh
@@ -43,7 +43,7 @@ fi
 #
 # FIXME: need a scheme for changing this `nightly` value to `beta` and `stable`
 #        either automatically or manually.
-export RUST_RELEASE_CHANNEL=beta
+export RUST_RELEASE_CHANNEL=nightly
 if [ "$DEPLOY$DEPLOY_ALT" != "" ]; then
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --release-channel=$RUST_RELEASE_CHANNEL"
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-llvm-static-stdcpp"
diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 3a3fd27d52532..6827364c0f805 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -47,8 +47,6 @@ assert_eq!(size_of::<Option<std::num::", stringify!($Ty), ">>(), size_of::<", st
                 #[stable(feature = "nonzero", since = "1.28.0")]
                 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
                 #[repr(transparent)]
-                // FIXME: the rustc_layout_scalar_valid_range_start attr is marked as unused
-                #[cfg_attr(stage0, allow(unused_attributes))]
                 #[rustc_layout_scalar_valid_range_start(1)]
                 pub struct $Ty($Int);
             }
@@ -70,8 +68,6 @@ assert_eq!(size_of::<Option<std::num::", stringify!($Ty), ">>(), size_of::<", st
                 #[inline]
                 pub fn new(n: $Int) -> Option<Self> {
                     if n != 0 {
-                        // FIXME: this unsafe block is actually needed
-                        #[cfg_attr(stage0, allow(unused_unsafe))]
                         Some(unsafe { $Ty(n) })
                     } else {
                         None
diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 979a7b231ecf3..02eef07afd7ab 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -2718,8 +2718,6 @@ impl<T: ?Sized> PartialOrd for *mut T {
                      (if you also use #[may_dangle]), Send, and/or Sync")]
 #[doc(hidden)]
 #[repr(transparent)]
-// FIXME: the rustc_layout_scalar_valid_range_start attr is marked as unused
-#[cfg_attr(stage0, allow(unused_attributes))]
 #[rustc_layout_scalar_valid_range_start(1)]
 pub struct Unique<T: ?Sized> {
     pointer: *const T,
@@ -2785,8 +2783,6 @@ impl<T: ?Sized> Unique<T> {
     /// Creates a new `Unique` if `ptr` is non-null.
     pub fn new(ptr: *mut T) -> Option<Self> {
         if !ptr.is_null() {
-            // FIXME: this unsafe block is actually needed
-            #[cfg_attr(stage0, allow(unused_unsafe))]
             Some(unsafe { Unique { pointer: ptr as _, _marker: PhantomData } })
         } else {
             None
@@ -2843,8 +2839,6 @@ impl<T: ?Sized> fmt::Pointer for Unique<T> {
 #[unstable(feature = "ptr_internals", issue = "0")]
 impl<'a, T: ?Sized> From<&'a mut T> for Unique<T> {
     fn from(reference: &'a mut T) -> Self {
-        // FIXME: this unsafe block is actually needed
-        #[cfg_attr(stage0, allow(unused_unsafe))]
         unsafe { Unique { pointer: reference as *mut T, _marker: PhantomData } }
     }
 }
@@ -2852,8 +2846,6 @@ impl<'a, T: ?Sized> From<&'a mut T> for Unique<T> {
 #[unstable(feature = "ptr_internals", issue = "0")]
 impl<'a, T: ?Sized> From<&'a T> for Unique<T> {
     fn from(reference: &'a T) -> Self {
-        // FIXME: this unsafe block is actually needed
-        #[cfg_attr(stage0, allow(unused_unsafe))]
         unsafe { Unique { pointer: reference as *const T, _marker: PhantomData } }
     }
 }
@@ -2861,8 +2853,6 @@ impl<'a, T: ?Sized> From<&'a T> for Unique<T> {
 #[unstable(feature = "ptr_internals", issue = "0")]
 impl<'a, T: ?Sized> From<NonNull<T>> for Unique<T> {
     fn from(p: NonNull<T>) -> Self {
-        // FIXME: this unsafe block is actually needed
-        #[cfg_attr(stage0, allow(unused_unsafe))]
         unsafe { Unique { pointer: p.pointer, _marker: PhantomData } }
     }
 }
@@ -3052,8 +3042,6 @@ impl<T: ?Sized> hash::Hash for NonNull<T> {
 impl<T: ?Sized> From<Unique<T>> for NonNull<T> {
     #[inline]
     fn from(unique: Unique<T>) -> Self {
-        // FIXME: this unsafe block is actually needed
-        #[cfg_attr(stage0, allow(unused_unsafe))]
         unsafe { NonNull { pointer: unique.pointer } }
     }
 }
@@ -3062,8 +3050,6 @@ impl<T: ?Sized> From<Unique<T>> for NonNull<T> {
 impl<'a, T: ?Sized> From<&'a mut T> for NonNull<T> {
     #[inline]
     fn from(reference: &'a mut T) -> Self {
-        // FIXME: this unsafe block is actually needed
-        #[cfg_attr(stage0, allow(unused_unsafe))]
         unsafe { NonNull { pointer: reference as *mut T } }
     }
 }
@@ -3072,8 +3058,6 @@ impl<'a, T: ?Sized> From<&'a mut T> for NonNull<T> {
 impl<'a, T: ?Sized> From<&'a T> for NonNull<T> {
     #[inline]
     fn from(reference: &'a T) -> Self {
-        // FIXME: this unsafe block is actually needed
-        #[cfg_attr(stage0, allow(unused_unsafe))]
         unsafe { NonNull { pointer: reference as *const T } }
     }
 }
diff --git a/src/stage0.txt b/src/stage0.txt
index 0983add49ca77..2e376ed1cede5 100644
--- a/src/stage0.txt
+++ b/src/stage0.txt
@@ -12,9 +12,9 @@
 # source tarball for a stable release you'll likely see `1.x.0` for rustc and
 # `0.x.0` for Cargo where they were released on `date`.
 
-date: 2019-01-16
-rustc: 1.32.0
-cargo: 0.33.0
+date: 2019-01-04
+rustc: beta
+cargo: beta
 
 # When making a stable release the process currently looks like:
 #
@@ -34,4 +34,4 @@ cargo: 0.33.0
 # looking at a beta source tarball and it's uncommented we'll shortly comment it
 # out.
 
-dev: 1
+#dev: 1
diff --git a/src/tools/cargo b/src/tools/cargo
index 9b5d4b755617d..2b4a5f1f0bb6e 160000
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 9b5d4b755617d60dd841912b354be8a6b6b3849a
+Subproject commit 2b4a5f1f0bb6e13759e88ea9512527b0beba154f