remove InferCtxt::clear_caches

Author: Lukas Markeffsky

compiler/rustc_infer/src/infer/mod.rs

@@ -1521,15 +1521,6 @@ impl<'tcx> InferCtxt<'tcx> {
         closure_kind_ty.to_opt_closure_kind()
     }
 
-    /// Clears the selection, evaluation, and projection caches. This is useful when
-    /// repeatedly attempting to select an `Obligation` while changing only
-    /// its `ParamEnv`, since `FulfillmentContext` doesn't use probing.
-    pub fn clear_caches(&self) {
-        self.selection_cache.clear();
-        self.evaluation_cache.clear();
-        self.inner.borrow_mut().projection_cache().clear();
-    }
-
     pub fn universe(&self) -> ty::UniverseIndex {
         self.universe.get()
     }

compiler/rustc_trait_selection/src/traits/auto_trait.rs

@@ -152,7 +152,6 @@ impl<'tcx> AutoTraitFinder<'tcx> {
              with {:?}",
             trait_ref, full_env
         );
-        infcx.clear_caches();
 
         // At this point, we already have all of the bounds we need. FulfillmentContext is used
         // to store all of the necessary region/lifetime bounds in the InferContext, as well as
@@ -255,8 +254,6 @@ impl<'tcx> AutoTraitFinder<'tcx> {
         let dummy_cause = ObligationCause::dummy();
 
         while let Some(pred) = predicates.pop_front() {
-            infcx.clear_caches();
-
             if !already_visited.insert(pred) {
                 continue;
             }