Assert defining anchor is set in take_opaque_types

compiler/rustc_infer/src/infer/canonical/query_response.rs

@@ -156,10 +156,7 @@ impl<'tcx> InferCtxt<'tcx> {
     /// As the new solver does canonicalization slightly differently, this is also used there
     /// for now. This should hopefully change fairly soon.
     pub fn take_opaque_types_for_query_response(&self) -> Vec<(Ty<'tcx>, Ty<'tcx>)> {
-        self.inner
-            .borrow_mut()
-            .opaque_type_storage
-            .take_opaque_types()
+        std::mem::take(&mut self.inner.borrow_mut().opaque_type_storage.opaque_types)
             .into_iter()
             .map(|(k, v)| (self.tcx.mk_opaque(k.def_id.to_def_id(), k.substs), v.hidden_type.ty))
             .collect()

compiler/rustc_infer/src/infer/mod.rs

@@ -1338,6 +1338,12 @@ impl<'tcx> InferCtxt<'tcx> {
         var_infos
     }
 
+    #[instrument(level = "debug", skip(self), ret)]
+    pub fn take_opaque_types(&self) -> opaque_types::OpaqueTypeMap<'tcx> {
+        debug_assert_ne!(self.defining_use_anchor, DefiningAnchor::Error);
+        std::mem::take(&mut self.inner.borrow_mut().opaque_type_storage.opaque_types)
+    }
+
     pub fn ty_to_string(&self, t: Ty<'tcx>) -> String {
         self.resolve_vars_if_possible(t).to_string()
     }

compiler/rustc_infer/src/infer/opaque_types/table.rs

@@ -29,11 +29,6 @@ impl<'tcx> OpaqueTypeStorage<'tcx> {
         }
     }
 
-    #[instrument(level = "debug", ret)]
-    pub fn take_opaque_types(&mut self) -> OpaqueTypeMap<'tcx> {
-        std::mem::take(&mut self.opaque_types)
-    }
-
     #[inline]
     pub(crate) fn with_log<'a>(
         &'a mut self,