Store hashes in special types so they aren't accidentally encoded as numbers

2 files changed, 4 insertions, 3 deletions

diff --git a/compiler/rustc_query_system/src/query/mod.rs b/compiler/rustc_query_system/src/query/mod.rs
index 312b0e1688d..fa1f51b04da 100644
--- a/compiler/rustc_query_system/src/query/mod.rs
+++ b/compiler/rustc_query_system/src/query/mod.rs
@@ -16,6 +16,7 @@ pub use self::config::{HashResult, QueryConfig, TryLoadFromDisk};
 
 use crate::dep_graph::DepKind;
 use crate::dep_graph::{DepNodeIndex, HasDepContext, SerializedDepNodeIndex};
+use rustc_data_structures::stable_hasher::Hash64;
 use rustc_data_structures::sync::Lock;
 use rustc_errors::Diagnostic;
 use rustc_hir::def::DefKind;
@@ -37,7 +38,7 @@ pub struct QueryStackFrame<D: DepKind> {
     /// This hash is used to deterministically pick
     /// a query to remove cycles in the parallel compiler.
     #[cfg(parallel_compiler)]
-    hash: u64,
+    hash: Hash64,
 }
 
 impl<D: DepKind> QueryStackFrame<D> {
@@ -49,7 +50,7 @@ impl<D: DepKind> QueryStackFrame<D> {
         def_kind: Option<DefKind>,
         dep_kind: D,
         ty_adt_id: Option<DefId>,
-        _hash: impl FnOnce() -> u64,
+        _hash: impl FnOnce() -> Hash64,
     ) -> Self {
         Self {
             description,
diff --git a/compiler/rustc_query_system/src/query/plumbing.rs b/compiler/rustc_query_system/src/query/plumbing.rs
index 20310483d7e..39b89017593 100644
--- a/compiler/rustc_query_system/src/query/plumbing.rs
+++ b/compiler/rustc_query_system/src/query/plumbing.rs
@@ -573,7 +573,7 @@ where
             // from disk. Re-hashing results is fairly expensive, so we can't
             // currently afford to verify every hash. This subset should still
             // give us some coverage of potential bugs though.
-            let try_verify = prev_fingerprint.as_value().1 % 32 == 0;
+            let try_verify = prev_fingerprint.split().1.as_u64() % 32 == 0;
             if std::intrinsics::unlikely(
                 try_verify || qcx.dep_context().sess().opts.unstable_opts.incremental_verify_ich,
             ) {