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-rw-r--r--src/liballoc/heap.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/liballoc/heap.rs b/src/liballoc/heap.rs
index 57baa811b9d..4c7441b1d2a 100644
--- a/src/liballoc/heap.rs
+++ b/src/liballoc/heap.rs
@@ -133,6 +133,7 @@ const MIN_ALIGN: usize = 16;
 
 #[cfg(feature = "external_funcs")]
 mod imp {
+    #[allow(improper_ctypes)]
     extern {
         fn rust_allocate(size: usize, align: usize) -> *mut u8;
         fn rust_deallocate(ptr: *mut u8, old_size: usize, align: usize);