diff --git a/example/mini_core.rs b/example/mini_core.rs
index 8da705e0cb0..489259d1a6b 100644
--- a/example/mini_core.rs
+++ b/example/mini_core.rs
@@ -567,7 +567,7 @@ pub mod intrinsics {
         pub fn copy<T>(src: *const T, dst: *mut T, count: usize);
         pub fn transmute<T, U>(e: T) -> U;
         pub fn ctlz_nonzero<T>(x: T) -> T;
-        pub fn needs_drop<T>() -> bool;
+        pub fn needs_drop<T: ?::Sized>() -> bool;
         pub fn bitreverse<T>(x: T) -> T;
         pub fn bswap<T>(x: T) -> T;
         pub fn write_bytes<T>(dst: *mut T, val: u8, count: usize);
diff --git a/example/mini_core_hello_world.rs b/example/mini_core_hello_world.rs
index 85ca908d0a2..059f62f7bf8 100644
--- a/example/mini_core_hello_world.rs
+++ b/example/mini_core_hello_world.rs
@@ -55,6 +55,11 @@ struct NoisyDrop {
     inner: NoisyDropInner,
 }
 
+struct NoisyDropUnsized {
+    text: str,
+    inner: NoisyDropInner,
+}
+
 struct NoisyDropInner;
 
 impl Drop for NoisyDrop {
@@ -170,7 +175,9 @@ fn main() {
         assert_eq!(intrinsics::min_align_of_val(&a) as u8, intrinsics::min_align_of::<&str>() as u8);
 
         assert!(!intrinsics::needs_drop::<u8>());
+        assert!(!intrinsics::needs_drop::<[u8]>());
         assert!(intrinsics::needs_drop::<NoisyDrop>());
+        assert!(intrinsics::needs_drop::<NoisyDropUnsized>());
 
         Unique {
             pointer: NonNull(1 as *mut &str),