diff --git a/patches/0015-Remove-usage-of-unsized-locals.patch b/patches/0015-Remove-usage-of-unsized-locals.patch
new file mode 100644
index 00000000000..277d44ebfa4
--- /dev/null
+++ b/patches/0015-Remove-usage-of-unsized-locals.patch
@@ -0,0 +1,99 @@
+From 7403e2998345ef0650fd50628d7098d4d1e88e5c Mon Sep 17 00:00:00 2001
+From: bjorn3 <bjorn3@users.noreply.github.com>
+Date: Sat, 6 Apr 2019 12:16:21 +0200
+Subject: [PATCH] Remove usage of unsized locals
+
+---
+ src/liballoc/boxed.rs                | 23 -----------------------
+ src/libstd/sys_common/at_exit_imp.rs |  2 ++
+ src/libstd/sys_common/mod.rs         |  1 -
+ src/libstd/sys_common/thread.rs      |  7 +------
+ 4 files changed, 3 insertions(+), 30 deletions(-)
+
+diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
+index f6dee7c..0c6a8c0 100644
+--- a/src/liballoc/boxed.rs
++++ b/src/liballoc/boxed.rs
+@@ -694,29 +694,6 @@ impl<I: ExactSizeIterator + ?Sized> ExactSizeIterator for Box<I> {
+ #[stable(feature = "fused", since = "1.26.0")]
+ impl<I: FusedIterator + ?Sized> FusedIterator for Box<I> {}
+ 
+-#[stable(feature = "boxed_closure_impls", since = "1.35.0")]
+-impl<A, F: FnOnce<A> + ?Sized> FnOnce<A> for Box<F> {
+-    type Output = <F as FnOnce<A>>::Output;
+-
+-    extern "rust-call" fn call_once(self, args: A) -> Self::Output {
+-        <F as FnOnce<A>>::call_once(*self, args)
+-    }
+-}
+-
+-#[stable(feature = "boxed_closure_impls", since = "1.35.0")]
+-impl<A, F: FnMut<A> + ?Sized> FnMut<A> for Box<F> {
+-    extern "rust-call" fn call_mut(&mut self, args: A) -> Self::Output {
+-        <F as FnMut<A>>::call_mut(self, args)
+-    }
+-}
+-
+-#[stable(feature = "boxed_closure_impls", since = "1.35.0")]
+-impl<A, F: Fn<A> + ?Sized> Fn<A> for Box<F> {
+-    extern "rust-call" fn call(&self, args: A) -> Self::Output {
+-        <F as Fn<A>>::call(self, args)
+-    }
+-}
+-
+ /// `FnBox` is a version of the `FnOnce` intended for use with boxed
+ /// closure objects. The idea is that where one would normally store a
+ /// `Box<dyn FnOnce()>` in a data structure, you should use
+diff --git a/src/libstd/sys_common/at_exit_imp.rs b/src/libstd/sys_common/at_exit_imp.rs
+index 1181b86..20f9251 100644
+--- a/src/libstd/sys_common/at_exit_imp.rs
++++ b/src/libstd/sys_common/at_exit_imp.rs
+@@ -38,6 +38,7 @@ unsafe fn init() -> bool {
+     true
+ }
+ 
++/*
+ pub fn cleanup() {
+     for i in 1..=ITERS {
+         unsafe {
+@@ -60,6 +61,7 @@ pub fn cleanup() {
+         }
+     }
+ }
++*/
+ 
+ pub fn push(f: Box<dyn FnBox()>) -> bool {
+     unsafe {
+diff --git a/src/libstd/sys_common/mod.rs b/src/libstd/sys_common/mod.rs
+index 6260c3b..611ed7e 100644
+--- a/src/libstd/sys_common/mod.rs
++++ b/src/libstd/sys_common/mod.rs
+@@ -127,7 +127,6 @@ pub fn cleanup() {
+     CLEANUP.call_once(|| unsafe {
+         sys::args::cleanup();
+         sys::stack_overflow::cleanup();
+-        at_exit_imp::cleanup();
+     });
+ }
+ 
+diff --git a/src/libstd/sys_common/thread.rs b/src/libstd/sys_common/thread.rs
+index b2142e7..718bb1c 100644
+--- a/src/libstd/sys_common/thread.rs
++++ b/src/libstd/sys_common/thread.rs
+@@ -6,12 +6,7 @@ use crate::sys::thread as imp;
+ 
+ #[allow(dead_code)]
+ pub unsafe fn start_thread(main: *mut u8) {
+-    // Next, set up our stack overflow handler which may get triggered if we run
+-    // out of stack.
+-    let _handler = stack_overflow::Handler::new();
+-
+-    // Finally, let's run some code.
+-    Box::from_raw(main as *mut Box<dyn FnBox()>)()
++    panic!("Threads are not yet supported, because cranelift doesn't support atomics.");
+ }
+ 
+ pub fn min_stack() -> usize {
+-- 
+2.20.1 (Apple Git-117)
+