Auto merge of #27309 - eddyb:snapshot-infdef, r=alexcrichton

FreeBSD i386 snapshot is missing, failed tests (possibly spurious).
r? @alexcrichton

src/liballoc/boxed.rs

@@ -300,7 +300,7 @@ impl<T: Clone> Clone for Box<T> {
     /// let y = x.clone();
     /// ```
     #[inline]
-    fn clone(&self) -> Box<T> { box (HEAP) {(**self).clone()} }
+    fn clone(&self) -> Box<T> { box {(**self).clone()} }
     /// Copies `source`'s contents into `self` without creating a new allocation.
     ///
     /// # Examples

src/liballoc/lib.rs

@@ -70,8 +70,6 @@
        test(no_crate_inject))]
 #![no_std]
 
-// SNAP d4432b3
-#![allow(unused_features)] // until feature(placement_in_syntax) is in snap
 #![feature(allocator)]
 #![feature(box_syntax)]
 #![feature(coerce_unsized)]