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-rw-r--r--compiler/rustc_query_system/src/dep_graph/dep_node.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_query_system/src/dep_graph/dep_node.rs b/compiler/rustc_query_system/src/dep_graph/dep_node.rs
index 3fb59ad26f6..f2a68e35671 100644
--- a/compiler/rustc_query_system/src/dep_graph/dep_node.rs
+++ b/compiler/rustc_query_system/src/dep_graph/dep_node.rs
@@ -304,6 +304,9 @@ impl<HCX> ToStableHashKey<HCX> for WorkProductId {
 impl StableOrd for WorkProductId {
     // Fingerprint can use unstable (just a tuple of `u64`s), so WorkProductId can as well
     const CAN_USE_UNSTABLE_SORT: bool = true;
+
+    // `WorkProductId` sort order is not affected by (de)serialization.
+    const THIS_IMPLEMENTATION_HAS_BEEN_TRIPLE_CHECKED: () = ();
 }
 
 // Some types are used a lot. Make sure they don't unintentionally get bigger.