Split CommonTypes into CommonTypes and CommonLifetimes

src/librustc/ty/context.rs

@@ -223,7 +223,9 @@ pub struct CommonTypes<'tcx> {
     /// a trait object, and which gets removed in `ExistentialTraitRef`.
     /// This type must not appear anywhere in other converted types.
     pub trait_object_dummy_self: Ty<'tcx>,
+}
 
+pub struct CommonLifetimes<'tcx> {
     pub re_empty: Region<'tcx>,
     pub re_static: Region<'tcx>,
     pub re_erased: Region<'tcx>,
@@ -933,11 +935,6 @@ EnumLiftImpl! {
 impl<'tcx> CommonTypes<'tcx> {
     fn new(interners: &CtxtInterners<'tcx>) -> CommonTypes<'tcx> {
         let mk = |sty| CtxtInterners::intern_ty(interners, interners, sty);
-        let mk_region = |r| {
-            interners.region.borrow_mut().intern(r, |r| {
-                Interned(interners.arena.alloc(r))
-            }).0
-        };
 
         CommonTypes {
             unit: mk(Tuple(List::empty())),
@@ -961,10 +958,22 @@ impl<'tcx> CommonTypes<'tcx> {
             f64: mk(Float(ast::FloatTy::F64)),
 
             trait_object_dummy_self: mk(Infer(ty::FreshTy(0))),
+        }
+    }
+}
 
-            re_empty: mk_region(RegionKind::ReEmpty),
-            re_static: mk_region(RegionKind::ReStatic),
-            re_erased: mk_region(RegionKind::ReErased),
+impl<'tcx> CommonLifetimes<'tcx> {
+    fn new(interners: &CtxtInterners<'tcx>) -> CommonLifetimes<'tcx> {
+        let mk = |r| {
+            interners.region.borrow_mut().intern(r, |r| {
+                Interned(interners.arena.alloc(r))
+            }).0
+        };
+
+        CommonLifetimes {
+            re_empty: mk(RegionKind::ReEmpty),
+            re_static: mk(RegionKind::ReStatic),
+            re_erased: mk(RegionKind::ReErased),
         }
     }
 }
@@ -1016,6 +1025,9 @@ pub struct GlobalCtxt<'tcx> {
     /// Common types, pre-interned for your convenience.
     pub types: CommonTypes<'tcx>,
 
+    /// Common lifetimes, pre-interned for your convenience.
+    pub lifetimes: CommonLifetimes<'tcx>,
+
     /// Map indicating what traits are in scope for places where this
     /// is relevant; generated by resolve.
     trait_map: FxHashMap<DefIndex,
@@ -1214,6 +1226,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
         });
         let interners = CtxtInterners::new(&arenas.interner);
         let common_types = CommonTypes::new(&interners);
+        let common_lifetimes = CommonLifetimes::new(&interners);
         let dep_graph = hir.dep_graph.clone();
         let max_cnum = cstore.crates_untracked().iter().map(|c| c.as_usize()).max().unwrap_or(0);
         let mut providers = IndexVec::from_elem_n(extern_providers, max_cnum + 1);
@@ -1268,6 +1281,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             global_interners: interners,
             dep_graph,
             types: common_types,
+            lifetimes: common_lifetimes,
             trait_map,
             export_map: resolutions.export_map.into_iter().map(|(k, v)| {
                 let exports: Vec<_> = v.into_iter().map(|e| {
@@ -2486,7 +2500,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
 
     #[inline]
     pub fn mk_static_str(self) -> Ty<'tcx> {
-        self.mk_imm_ref(self.types.re_static, self.mk_str())
+        self.mk_imm_ref(self.lifetimes.re_static, self.mk_str())
     }
 
     #[inline]