From 443cef56184847ea04e3f8fa75bab546bed796e0 Mon Sep 17 00:00:00 2001
From: Aaron Hill <aa1ronham@gmail.com>
Date: Fri, 19 Mar 2021 21:47:57 -0400
Subject: [PATCH] Debug-print result when an unstable fingerprint is detected

---
 compiler/rustc_query_system/src/query/plumbing.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/rustc_query_system/src/query/plumbing.rs b/compiler/rustc_query_system/src/query/plumbing.rs
index 6e16f803f8c..77267489a75 100644
--- a/compiler/rustc_query_system/src/query/plumbing.rs
+++ b/compiler/rustc_query_system/src/query/plumbing.rs
@@ -590,7 +590,7 @@ fn incremental_verify_ich<CTX, K, V: Debug>(
 
     let old_hash = tcx.dep_graph().fingerprint_of(dep_node_index);
 
-    assert!(new_hash == old_hash, "found unstable fingerprints for {:?}", dep_node,);
+    assert!(new_hash == old_hash, "found unstable fingerprints for {:?}: {:?}", dep_node, result);
 }
 
 fn force_query_with_job<C, CTX>(