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-rw-r--r--compiler/rustc_session/src/config.rs4
1 files changed, 3 insertions, 1 deletions
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index d5428df0329..f4fd9dee02e 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -491,9 +491,11 @@ pub enum OutputType {
     DepInfo,
 }
 
-// Trivial C-Style enums have a stable sort order across compilation sessions.
 impl StableOrd for OutputType {
     const CAN_USE_UNSTABLE_SORT: bool = true;
+
+    // Trivial C-Style enums have a stable sort order across compilation sessions.
+    const THIS_IMPLEMENTATION_HAS_BEEN_TRIPLE_CHECKED: () = ();
 }
 
 impl<HCX: HashStableContext> ToStableHashKey<HCX> for OutputType {