rustc: remove usage of root_map from astencode

src/librustc/driver/driver.rs

@@ -359,11 +359,10 @@ pub fn phase_3_run_analysis_passes(sess: Session,
     time(time_passes, "liveness checking", (), |_|
          middle::liveness::check_crate(&ty_cx, &capture_map, krate));
 
-    let root_map =
-        time(time_passes, "borrow checking", (), |_|
-             middle::borrowck::check_crate(&ty_cx, &moves_map,
-                                           &moved_variables_set,
-                                           &capture_map, krate));
+    time(time_passes, "borrow checking", (), |_|
+         middle::borrowck::check_crate(&ty_cx, &moves_map,
+                                       &moved_variables_set,
+                                       &capture_map, krate));
 
     drop(moves_map);
     drop(moved_variables_set);
@@ -391,7 +390,6 @@ pub fn phase_3_run_analysis_passes(sess: Session,
         exported_items: exported_items,
         public_items: public_items,
         maps: astencode::Maps {
-            root_map: root_map,
             capture_map: RefCell::new(capture_map)
         },
         reachable: reachable_map

src/librustc/middle/astencode.rs

@@ -54,7 +54,6 @@ use writer = serialize::ebml::writer;
 
 // Auxiliary maps of things to be encoded
 pub struct Maps {
-    pub root_map: middle::borrowck::root_map,
     pub capture_map: RefCell<middle::moves::CaptureMap>,
 }
 

src/librustc/middle/const_eval.rs

@@ -24,7 +24,6 @@ use syntax::visit;
 use syntax::{ast, ast_map, ast_util};
 
 use std::cell::RefCell;
-use collections::HashMap;
 use std::rc::Rc;
 
 //
@@ -127,7 +126,6 @@ pub fn lookup_variant_by_id(tcx: &ty::ctxt,
             None => {}
         }
         let maps = astencode::Maps {
-            root_map: HashMap::new(),
             capture_map: RefCell::new(NodeMap::new())
         };
         let e = match csearch::maybe_get_item_ast(tcx, enum_def,
@@ -166,7 +164,6 @@ pub fn lookup_const_by_id(tcx: &ty::ctxt, def_id: ast::DefId)
             None => {}
         }
         let maps = astencode::Maps {
-            root_map: HashMap::new(),
             capture_map: RefCell::new(NodeMap::new())
         };
         let e = match csearch::maybe_get_item_ast(tcx, def_id,