Only compute DefKind through the query.

compiler/rustc_middle/src/hir/map/mod.rs

@@ -225,7 +225,8 @@ impl<'hir> Map<'hir> {
         self.tcx.definitions_untracked().iter_local_def_id()
     }
 
-    pub fn opt_def_kind(self, local_def_id: LocalDefId) -> Option<DefKind> {
+    /// Do not call this function directly. The query should be called.
+    pub(super) fn opt_def_kind(self, local_def_id: LocalDefId) -> Option<DefKind> {
         let hir_id = self.local_def_id_to_hir_id(local_def_id);
         let def_kind = match self.find(hir_id)? {
             Node::Item(item) => match item.kind {

compiler/rustc_privacy/src/lib.rs

@@ -467,7 +467,7 @@ impl<'tcx> EmbargoVisitor<'tcx> {
         }
 
         let macro_module_def_id = self.tcx.local_parent(local_def_id);
-        if self.tcx.hir().opt_def_kind(macro_module_def_id) != Some(DefKind::Mod) {
+        if self.tcx.opt_def_kind(macro_module_def_id) != Some(DefKind::Mod) {
             // The macro's parent doesn't correspond to a `mod`, return early (#63164, #65252).
             return;
         }

compiler/rustc_query_impl/src/plumbing.rs

@@ -287,11 +287,14 @@ macro_rules! define_queries {
                 } else {
                     Some(key.default_span(*tcx))
                 };
-                // Use `tcx.hir().opt_def_kind()` to reduce the chance of
-                // accidentally triggering an infinite query loop.
-                let def_kind = key.key_as_def_id()
-                    .and_then(|def_id| def_id.as_local())
-                    .and_then(|def_id| tcx.hir().opt_def_kind(def_id));
+                let def_kind = if kind == dep_graph::DepKind::opt_def_kind {
+                    // Try to avoid infinite recursion.
+                    None
+                } else {
+                    key.key_as_def_id()
+                        .and_then(|def_id| def_id.as_local())
+                        .and_then(|def_id| tcx.opt_def_kind(def_id))
+                };
                 let hash = || {
                     let mut hcx = tcx.create_stable_hashing_context();
                     let mut hasher = StableHasher::new();