removed unused import

Author: Maaarcocr

src/librustc/traits/trans/mod.rs

@@ -13,16 +13,14 @@
 // seems likely that they should eventually be merged into more
 // general routines.
 
-use dep_graph::{DepGraph, DepKind, DepTrackingMap, DepTrackingMapConfig};
+use dep_graph::{DepKind, DepTrackingMapConfig};
 use infer::TransNormalize;
-use std::cell::RefCell;
 use std::marker::PhantomData;
 use syntax_pos::DUMMY_SP;
 use traits::{FulfillmentContext, Obligation, ObligationCause, SelectionContext, Vtable};
 use ty::{self, Ty, TyCtxt};
 use ty::subst::{Subst, Substs};
 use ty::fold::{TypeFoldable, TypeFolder};
-use util::common::MemoizationMap;
 
 /// Attempts to resolve an obligation to a vtable.. The result is
 /// a shallow vtable resolution -- meaning that we do not
@@ -136,20 +134,6 @@ impl<'a, 'gcx> TypeFolder<'gcx, 'gcx> for AssociatedTypeNormalizer<'a, 'gcx> {
     }
 }
 
-/// Specializes caches used in trans -- in particular, they assume all
-/// types are fully monomorphized and that free regions can be erased.
-pub struct TransTraitCaches<'tcx> {
-    project_cache: RefCell<DepTrackingMap<ProjectionCache<'tcx>>>,
-}
-
-impl<'tcx> TransTraitCaches<'tcx> {
-    pub fn new(graph: DepGraph) -> Self {
-        TransTraitCaches {
-            project_cache: RefCell::new(DepTrackingMap::new(graph)),
-        }
-    }
-}
-
 // Implement DepTrackingMapConfig for `trait_cache`
 pub struct TraitSelectionCache<'tcx> {
     data: PhantomData<&'tcx ()>

src/librustc/ty/context.rs

@@ -851,9 +851,6 @@ pub struct GlobalCtxt<'tcx> {
 
     pub sess: &'tcx Session,
 
-
-    pub trans_trait_caches: traits::trans::TransTraitCaches<'tcx>,
-
     pub dep_graph: DepGraph,
 
     /// Common types, pre-interned for your convenience.
@@ -1137,7 +1134,6 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
         tls::enter_global(GlobalCtxt {
             sess: s,
             cstore,
-            trans_trait_caches: traits::trans::TransTraitCaches::new(dep_graph.clone()),
             global_arenas: arenas,
             global_interners: interners,
             dep_graph: dep_graph.clone(),