diff --git a/src/librustc/ty/constness.rs b/src/librustc/ty/constness.rs
index 6df49683f688f..268015a56240e 100644
--- a/src/librustc/ty/constness.rs
+++ b/src/librustc/ty/constness.rs
@@ -109,6 +109,7 @@ pub fn provide(providers: &mut Providers<'_>) {
         match tcx.fn_sig(def_id).abi() {
             Abi::RustIntrinsic |
             Abi::PlatformIntrinsic => {
+                // FIXME: deduplicate these two lists as much as possible
                 match tcx.item_name(def_id) {
                     // Keep this list in the same order as the match patterns in
                     // `librustc_mir/interpret/intrinsics.rs`