Update borrowck

Author: Zoxc

src/librustc/arena.rs

@@ -59,6 +59,7 @@ macro_rules! arena_types {
                     rustc::infer::canonical::QueryResponse<'tcx, rustc::ty::Ty<'tcx>>
                 >,
             [few] crate_inherent_impls: rustc::ty::CrateInherentImpls,
+            [decode] borrowck: rustc::middle::borrowck::BorrowCheckResult,
         ], $tcx);
     )
 }

src/librustc/query/mod.rs

@@ -371,7 +371,7 @@ rustc_queries! {
     }
 
     BorrowChecking {
-        query borrowck(_: DefId) -> Lrc<BorrowCheckResult> {}
+        query borrowck(_: DefId) -> &'tcx BorrowCheckResult {}
 
         /// Borrow-checks the function body. If this is a closure, returns
         /// additional requirements that the closure's creator must verify.

src/librustc_borrowck/borrowck/mod.rs

@@ -32,7 +32,6 @@ use std::borrow::Cow;
 use std::cell::{Cell, RefCell};
 use std::fmt;
 use std::rc::Rc;
-use rustc_data_structures::sync::Lrc;
 use std::hash::{Hash, Hasher};
 use syntax::source_map::CompilerDesugaringKind;
 use syntax_pos::{MultiSpan, Span};
@@ -75,7 +74,7 @@ pub struct AnalysisData<'a, 'tcx: 'a> {
 }
 
 fn borrowck<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, owner_def_id: DefId)
-    -> Lrc<BorrowCheckResult>
+    -> &'tcx BorrowCheckResult
 {
     assert!(tcx.use_ast_borrowck() || tcx.migrate_borrowck());
 
@@ -89,7 +88,7 @@ fn borrowck<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, owner_def_id: DefId)
             // those things (notably the synthesized constructors from
             // tuple structs/variants) do not have an associated body
             // and do not need borrowchecking.
-            return Lrc::new(BorrowCheckResult {
+            return tcx.arena.alloc(BorrowCheckResult {
                 used_mut_nodes: Default::default(),
                 signalled_any_error: SignalledError::NoErrorsSeen,
             })
@@ -136,7 +135,7 @@ fn borrowck<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, owner_def_id: DefId)
         check_loans::check_loans(&mut bccx, &loan_dfcx, &flowed_moves, &all_loans, body);
     }
 
-    Lrc::new(BorrowCheckResult {
+    tcx.arena.alloc(BorrowCheckResult {
         used_mut_nodes: bccx.used_mut_nodes.into_inner(),
         signalled_any_error: bccx.signalled_any_error.into_inner(),
     })