Remove hook calling via `TyCtxtAt`.

All hooks receive a `TyCtxtAt` argument.

Currently hooks can be called through `TyCtxtAt` or `TyCtxt`. In the
latter case, a `TyCtxtAt` is constructed with a dummy span and passed to
the hook.

However, in practice hooks are never called through `TyCtxtAt`, and
always receive a dummy span. (I confirmed this via code inspection, and
double-checked it by temporarily making the `TyCtxtAt` code path panic
and running all the tests.)

This commit removes all the `TyCtxtAt` machinery for hooks. All hooks
now receive `TyCtxt` instead of `TyCtxtAt`. There are two existing hooks
that use `TyCtxtAt::span`: `const_caller_location_provider` and
`try_destructure_mir_constant_for_user_output`. For both hooks the span
is always a dummy span, probably unintentionally. This dummy span use is
now explicit. If a non-dummy span is needed for these two hooks it would
be easy to add it as an extra argument because hooks are less
constrained than queries.

1 files changed, 2 insertions, 3 deletions

diff --git a/compiler/rustc_query_impl/src/lib.rs b/compiler/rustc_query_impl/src/lib.rs
index d2bb0b3f277..bbc83cca99d 100644
--- a/compiler/rustc_query_impl/src/lib.rs
+++ b/compiler/rustc_query_impl/src/lib.rs
@@ -224,7 +224,6 @@ pub fn query_system<'a>(
 rustc_middle::rustc_query_append! { define_queries! }
 
 pub fn provide(providers: &mut rustc_middle::util::Providers) {
-    providers.hooks.alloc_self_profile_query_strings =
-        |tcx| alloc_self_profile_query_strings(tcx.tcx);
-    providers.hooks.query_key_hash_verify_all = |tcx| query_key_hash_verify_all(tcx.tcx);
+    providers.hooks.alloc_self_profile_query_strings = alloc_self_profile_query_strings;
+    providers.hooks.query_key_hash_verify_all = query_key_hash_verify_all;
 }