Document the `size_of_val` instrinsic

diff --git a/src/libcore/intrinsics.rs b/src/libcore/intrinsics.rs
index bc82f0230e5b44b1f52dcce24b15050ffc5a73d8..2d6b5b832c534f04bfb71debef29ee118d731e22 100644 (file)
--- a/src/libcore/intrinsics.rs
+++ b/src/libcore/intrinsics.rs
@@ -676,6 +676,10 @@
     pub fn min_align_of<T>() -> usize;
     pub fn pref_align_of<T>() -> usize;
 
+    /// The size of the referenced value in bytes.
+    ///
+    /// The stabilized version of this intrinsic is
+    /// [`std::mem::size_of_val`](../../std/mem/fn.size_of_val.html).
     pub fn size_of_val<T: ?Sized>(_: &T) -> usize;
     pub fn min_align_of_val<T: ?Sized>(_: &T) -> usize;