diff --git a/src/libcore/private.rs b/src/libcore/private.rs
index 6addb106de39..8e89a3de6a85 100644
--- a/src/libcore/private.rs
+++ b/src/libcore/private.rs
@@ -27,7 +27,7 @@ extern mod rustrt {
 #[abi = "rust-intrinsic"]
 extern mod rusti {
 
-    #[cfg(stage1)] #[cfg(stage2)] #[cfg(stage3)]    
+    #[cfg(stage1)] #[cfg(stage2)] #[cfg(stage3)]
     fn atomic_cxchg(dst: &mut int, old: int, src: int) -> int;
     fn atomic_xadd(dst: &mut int, src: int) -> int;
     fn atomic_xsub(dst: &mut int, src: int) -> int;
@@ -38,7 +38,7 @@ type rust_port_id = uint;
 
 type GlobalPtr = *libc::uintptr_t;
 
-// TODO: Remove once snapshots have atomic_cxchg
+// FIXME #3527: Remove once snapshots have atomic_cxchg
 #[cfg(stage0)]
 fn compare_and_swap(address: &mut libc::uintptr_t,
                     oldval: libc::uintptr_t,