Auto merge of #89266 - cjgillot:session-ich, r=michaelwoerister

Move ICH to rustc_query_system

Based on https://github.com/rust-lang/rust/pull/89183

The StableHashingContext does not need to be in rustc_middle.

This PR moves it to rustc_query_system. This will avoid a dependency between rustc_ast_lowering and rustc_middle in https://github.com/rust-lang/rust/pull/89124.

2 files changed, 1 insertions, 2 deletions

diff --git a/compiler/rustc_query_impl/src/lib.rs b/compiler/rustc_query_impl/src/lib.rs
index bb0e6511159..e50a8c191ad 100644
--- a/compiler/rustc_query_impl/src/lib.rs
+++ b/compiler/rustc_query_impl/src/lib.rs
@@ -20,10 +20,10 @@ use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_errors::DiagnosticBuilder;
 use rustc_middle::dep_graph;
-use rustc_middle::ich::StableHashingContext;
 use rustc_middle::ty::query::{query_keys, query_storage, query_stored, query_values};
 use rustc_middle::ty::query::{Providers, QueryEngine};
 use rustc_middle::ty::{self, TyCtxt};
+use rustc_query_system::ich::StableHashingContext;
 use rustc_span::Span;
 
 #[macro_use]
diff --git a/compiler/rustc_query_impl/src/plumbing.rs b/compiler/rustc_query_impl/src/plumbing.rs
index 818b798ab55..b71a1722036 100644
--- a/compiler/rustc_query_impl/src/plumbing.rs
+++ b/compiler/rustc_query_impl/src/plumbing.rs
@@ -36,7 +36,6 @@ impl<'tcx> std::ops::Deref for QueryCtxt<'tcx> {
 
 impl HasDepContext for QueryCtxt<'tcx> {
     type DepKind = rustc_middle::dep_graph::DepKind;
-    type StableHashingContext = rustc_middle::ich::StableHashingContext<'tcx>;
     type DepContext = TyCtxt<'tcx>;
 
     #[inline]