switch to Lrc

src/librustc/infer/lexical_region_resolve/mod.rs

@@ -247,7 +247,7 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
 
         // The current value of `vid` is a lower bound LB -- i.e., we
         // know that `LB <= vid` must be true.
-        let pick_lower_bound = match var_values.value(pick_vid) {
+        let pick_lower_bound: ty::Region<'tcx> = match var_values.value(pick_vid) {
             VarValue::ErrorValue => return false,
             VarValue::Value(r) => r,
         };
@@ -270,12 +270,12 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
         // if there >1 option, we only make a choice if there is a
         // single *least* choice -- i.e., some available region that
         // is `<=` all the others.
-        let mut least_choice = match options.next() {
+        let mut least_choice: ty::Region<'tcx> = match options.next() {
-            Some(r) => r,
+            Some(&r) => r,
             None => return false,
         };
         debug!("enforce_pick_constraint: least_choice={:?}", least_choice);
-        for option in options {
+        for &option in options {
             debug!("enforce_pick_constraint: option={:?}", option);
             if !self.sub_concrete_regions(least_choice, option) {
                 if self.sub_concrete_regions(option, least_choice) {

src/librustc/infer/mod.rs

@@ -26,11 +26,11 @@ use crate::ty::{FloatVid, IntVid, TyVid, ConstVid};
 use crate::util::nodemap::FxHashMap;
 
 use errors::DiagnosticBuilder;
+use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::unify as ut;
 use std::cell::{Cell, Ref, RefCell, RefMut};
 use std::collections::BTreeMap;
 use std::fmt;
-use std::rc::Rc;
 use syntax::ast;
 use syntax_pos::symbol::InternedString;
 use syntax_pos::Span;
@@ -913,7 +913,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         definition_span: Span,
         hidden_ty: Ty<'tcx>,
         region: ty::Region<'tcx>,
-        in_regions: &Rc<Vec<ty::Region<'tcx>>>,
+        in_regions: &Lrc<Vec<ty::Region<'tcx>>>,
     ) {
         debug!("pick_constraint({:?} <: {:?})", region, in_regions);
         self.borrow_region_constraints()

src/librustc/infer/opaque_types/mod.rs

@@ -11,7 +11,7 @@ use crate::ty::{self, GenericParamDefKind, Ty, TyCtxt};
 use crate::util::nodemap::DefIdMap;
 use errors::DiagnosticBuilder;
 use rustc_data_structures::fx::FxHashMap;
-use std::rc::Rc;
+use rustc_data_structures::sync::Lrc;
 use syntax_pos::Span;
 
 pub type OpaqueTypeMap<'tcx> = DefIdMap<OpaqueTypeDecl<'tcx>>;
@@ -428,7 +428,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         // Create the set of option regions: each region in the hidden
         // type can be equal to any of the region parameters of the
         // opaque type definition.
-        let option_regions: Rc<Vec<ty::Region<'tcx>>> = Rc::new(
+        let option_regions: Lrc<Vec<ty::Region<'tcx>>> = Lrc::new(
             abstract_type_generics
                 .params
                 .iter()

src/librustc/infer/region_constraints/mod.rs

@@ -8,6 +8,7 @@ use super::{MiscVariable, RegionVariableOrigin, SubregionOrigin};
 
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::indexed_vec::IndexVec;
+use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::unify as ut;
 use crate::hir::def_id::DefId;
 use crate::ty::ReStatic;
@@ -19,7 +20,6 @@ use syntax_pos::Span;
 use std::collections::BTreeMap;
 use std::{cmp, fmt, mem};
 use std::ops::Range;
-use std::rc::Rc;
 
 mod leak_check;
 
@@ -166,7 +166,7 @@ pub struct PickConstraint<'tcx> {
     pub pick_region: Region<'tcx>,
 
     /// the options O1..On
-    pub option_regions: Rc<Vec<Region<'tcx>>>,
+    pub option_regions: Lrc<Vec<Region<'tcx>>>,
 }
 
 BraceStructTypeFoldableImpl! {
@@ -694,7 +694,7 @@ impl<'tcx> RegionConstraintCollector<'tcx> {
         definition_span: Span,
         hidden_ty: Ty<'tcx>,
         pick_region: ty::Region<'tcx>,
-        option_regions: &Rc<Vec<ty::Region<'tcx>>>,
+        option_regions: &Lrc<Vec<ty::Region<'tcx>>>,
     ) {
         debug!("pick_constraint({:?} in {:#?})", pick_region, option_regions);