Auto merge of #41702 - frewsxcv:rollup, r=frewsxcv

Rollup of 6 pull requests

- Successful merges: #41661, #41662, #41673, #41688, #41692, #41693
- Failed merges:

Author: bors

src/bootstrap/bootstrap.py

@@ -414,8 +414,8 @@ def build_triple(self):
         # The goal here is to come up with the same triple as LLVM would,
         # at least for the subset of platforms we're willing to target.
         if ostype == 'Linux':
-            os = subprocess.check_output(['uname', '-o']).strip().decode(default_encoding)
-            if os == 'Android':
+            os_from_sp = subprocess.check_output(['uname', '-o']).strip().decode(default_encoding)
+            if os_from_sp == 'Android':
                 ostype = 'linux-android'
             else:
                 ostype = 'unknown-linux-gnu'

src/libcore/convert.rs

@@ -276,7 +276,7 @@ pub trait Into<T>: Sized {
 pub trait From<T>: Sized {
     /// Performs the conversion.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn from(T) -> Self;
+    fn from(_: T) -> Self;
 }
 
 /// An attempted conversion that consumes `self`, which may or may not be

src/libcore/hash/sip.rs

@@ -403,8 +403,8 @@ impl<S: Sip> Default for Hasher<S> {
 
 #[doc(hidden)]
 trait Sip {
-    fn c_rounds(&mut State);
-    fn d_rounds(&mut State);
+    fn c_rounds(_: &mut State);
+    fn d_rounds(_: &mut State);
 }
 
 #[derive(Debug, Clone, Default)]

src/libcore/ops.rs

@@ -2878,10 +2878,10 @@ pub trait Carrier {
     type Error;
 
     /// Create a `Carrier` from a success value.
-    fn from_success(Self::Success) -> Self;
+    fn from_success(_: Self::Success) -> Self;
 
     /// Create a `Carrier` from an error value.
-    fn from_error(Self::Error) -> Self;
+    fn from_error(_: Self::Error) -> Self;
 
     /// Translate this `Carrier` to another implementation of `Carrier` with the
     /// same associated types.

src/librand/distributions/mod.rs

@@ -53,7 +53,7 @@ pub trait Sample<Support> {
 // trait called `Sample` and the other should be `DependentSample`.
 pub trait IndependentSample<Support>: Sample<Support> {
     /// Generate a random value.
-    fn ind_sample<R: Rng>(&self, &mut R) -> Support;
+    fn ind_sample<R: Rng>(&self, _: &mut R) -> Support;
 }
 
 /// A wrapper for generating types that implement `Rand` via the

src/librand/lib.rs

@@ -329,7 +329,7 @@ impl<'a, R: fmt::Debug> fmt::Debug for AsciiGenerator<'a, R> {
 /// the same stream of randomness multiple times.
 pub trait SeedableRng<Seed>: Rng {
     /// Reseed an RNG with the given seed.
-    fn reseed(&mut self, Seed);
+    fn reseed(&mut self, _: Seed);
 
     /// Create a new RNG with the given seed.
     fn from_seed(seed: Seed) -> Self;

src/librustc/cfg/construct.rs

@@ -15,9 +15,11 @@ use syntax::ast;
 use syntax::ptr::P;
 
 use hir::{self, PatKind};
+use hir::def_id::DefId;
 
 struct CFGBuilder<'a, 'tcx: 'a> {
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
+    owner_def_id: DefId,
     tables: &'a ty::TypeckTables<'tcx>,
     graph: CFGGraph,
     fn_exit: CFGIndex,
@@ -56,6 +58,7 @@ pub fn construct<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
     let mut cfg_builder = CFGBuilder {
         tcx: tcx,
+        owner_def_id,
         tables: tables,
         graph: graph,
         fn_exit: fn_exit,
@@ -583,11 +586,12 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
                         scope_id: ast::NodeId,
                         to_index: CFGIndex) {
         let mut data = CFGEdgeData { exiting_scopes: vec![] };
-        let mut scope = self.tcx.region_maps.node_extent(from_expr.id);
-        let target_scope = self.tcx.region_maps.node_extent(scope_id);
+        let mut scope = self.tcx.node_extent(from_expr.id);
+        let target_scope = self.tcx.node_extent(scope_id);
+        let region_maps = self.tcx.region_maps(self.owner_def_id);
         while scope != target_scope {
-            data.exiting_scopes.push(scope.node_id(&self.tcx.region_maps));
-            scope = self.tcx.region_maps.encl_scope(scope);
+            data.exiting_scopes.push(scope.node_id());
+            scope = region_maps.encl_scope(scope);
         }
         self.graph.add_edge(from_index, to_index, data);
     }

src/librustc/dep_graph/dep_node.rs

@@ -56,7 +56,7 @@ pub enum DepNode<D: Clone + Debug> {
     WorkProduct(Arc<WorkProductId>),
 
     // Represents different phases in the compiler.
-    RegionResolveCrate,
+    RegionMaps(D),
     Coherence,
     Resolve,
     CoherenceCheckTrait(D),
@@ -197,7 +197,6 @@ impl<D: Clone + Debug> DepNode<D> {
             BorrowCheckKrate => Some(BorrowCheckKrate),
             MirKrate => Some(MirKrate),
             TypeckBodiesKrate => Some(TypeckBodiesKrate),
-            RegionResolveCrate => Some(RegionResolveCrate),
             Coherence => Some(Coherence),
             Resolve => Some(Resolve),
             Variance => Some(Variance),
@@ -223,6 +222,7 @@ impl<D: Clone + Debug> DepNode<D> {
                 def_ids.map(MirShim)
             }
             BorrowCheck(ref d) => op(d).map(BorrowCheck),
+            RegionMaps(ref d) => op(d).map(RegionMaps),
             RvalueCheck(ref d) => op(d).map(RvalueCheck),
             TransCrateItem(ref d) => op(d).map(TransCrateItem),
             TransInlinedItem(ref d) => op(d).map(TransInlinedItem),

src/librustc/hir/intravisit.rs

@@ -39,7 +39,7 @@ use syntax::codemap::Spanned;
 use syntax_pos::Span;
 use hir::*;
 use hir::def::Def;
-use hir::map::Map;
+use hir::map::{self, Map};
 use super::itemlikevisit::DeepVisitor;
 
 use std::cmp;
@@ -140,6 +140,23 @@ impl<'this, 'tcx> NestedVisitorMap<'this, 'tcx> {
 /// to monitor future changes to `Visitor` in case a new method with a
 /// new default implementation gets introduced.)
 pub trait Visitor<'v> : Sized {
+    /// Invokes the suitable visitor method for the given `Node`
+    /// extracted from the hir map.
+    fn visit_hir_map_node(&mut self, node: map::Node<'v>) {
+        match node {
+            map::NodeItem(a) => self.visit_item(a),
+            map::NodeForeignItem(a) => self.visit_foreign_item(a),
+            map::NodeTraitItem(a) => self.visit_trait_item(a),
+            map::NodeImplItem(a) => self.visit_impl_item(a),
+            map::NodeExpr(a) => self.visit_expr(a),
+            map::NodeStmt(a) => self.visit_stmt(a),
+            map::NodeTy(a) => self.visit_ty(a),
+            map::NodePat(a) => self.visit_pat(a),
+            map::NodeBlock(a) => self.visit_block(a),
+            _ => bug!("Visitor::visit_hir_map_node() not yet impl for node `{:?}`", node)
+        }
+    }
+
     ///////////////////////////////////////////////////////////////////////////
     // Nested items.
 

src/librustc/ich/impls_ty.rs

@@ -39,7 +39,7 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for ty::subst::Kind<'t
     }
 }
 
-impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for ty::Region {
+impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for ty::RegionKind<'tcx> {
     fn hash_stable<W: StableHasherResult>(&self,
                                           hcx: &mut StableHashingContext<'a, 'tcx>,
                                           hasher: &mut StableHasher<W>) {
@@ -432,17 +432,6 @@ impl_stable_hash_for!(enum ty::cast::CastKind {
     FnPtrAddrCast
 });
 
-impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for ::middle::region::CodeExtent
-{
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut StableHashingContext<'a, 'tcx>,
-                                          hasher: &mut StableHasher<W>) {
-        hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
-            hcx.tcx().region_maps.code_extent_data(*self).hash_stable(hcx, hasher);
-        });
-    }
-}
-
 impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for ::middle::region::CodeExtentData
 {
     fn hash_stable<W: StableHasherResult>(&self,
@@ -477,7 +466,7 @@ impl_stable_hash_for!(struct ty::adjustment::CoerceUnsizedInfo {
     custom_kind
 });
 
-impl_stable_hash_for!(struct ty::FreeRegion {
+impl_stable_hash_for!(struct ty::FreeRegion<'tcx> {
     scope,
     bound_region
 });

src/librustc/infer/combine.rs

@@ -315,7 +315,7 @@ impl<'cx, 'gcx, 'tcx> ty::fold::TypeFolder<'gcx, 'tcx> for Generalizer<'cx, 'gcx
         }
     }
 
-    fn fold_region(&mut self, r: &'tcx ty::Region) -> &'tcx ty::Region {
+    fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
         match *r {
             // Never make variables for regions bound within the type itself,
             // nor for erased regions.

src/librustc/infer/equate.rs

@@ -78,8 +78,8 @@ impl<'combine, 'infcx, 'gcx, 'tcx> TypeRelation<'infcx, 'gcx, 'tcx>
         }
     }
 
-    fn regions(&mut self, a: &'tcx ty::Region, b: &'tcx ty::Region)
-               -> RelateResult<'tcx, &'tcx ty::Region> {
+    fn regions(&mut self, a: ty::Region<'tcx>, b: ty::Region<'tcx>)
+               -> RelateResult<'tcx, ty::Region<'tcx>> {
         debug!("{}.regions({:?}, {:?})",
                self.tag(),
                a,

src/librustc/infer/error_reporting/mod.rs

@@ -69,6 +69,7 @@ use traits::{ObligationCause, ObligationCauseCode};
 use ty::{self, TyCtxt, TypeFoldable};
 use ty::{Region, Issue32330};
 use ty::error::TypeError;
+use syntax::ast::DUMMY_NODE_ID;
 use syntax_pos::{Pos, Span};
 use errors::{DiagnosticBuilder, DiagnosticStyledString};
 
@@ -78,7 +79,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
     pub fn note_and_explain_region(self,
                                    err: &mut DiagnosticBuilder,
                                    prefix: &str,
-                                   region: &'tcx ty::Region,
+                                   region: ty::Region<'tcx>,
                                    suffix: &str) {
         fn item_scope_tag(item: &hir::Item) -> &'static str {
             match item.node {
@@ -123,14 +124,14 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
                     format!("{}unknown scope: {:?}{}.  Please report a bug.",
                             prefix, scope, suffix)
                 };
-                let span = match scope.span(&self.region_maps, &self.hir) {
+                let span = match scope.span(&self.hir) {
                     Some(s) => s,
                     None => {
                         err.note(&unknown_scope());
                         return;
                     }
                 };
-                let tag = match self.hir.find(scope.node_id(&self.region_maps)) {
+                let tag = match self.hir.find(scope.node_id()) {
                     Some(hir_map::NodeBlock(_)) => "block",
                     Some(hir_map::NodeExpr(expr)) => match expr.node {
                         hir::ExprCall(..) => "call",
@@ -150,7 +151,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
                         return;
                     }
                 };
-                let scope_decorated_tag = match self.region_maps.code_extent_data(scope) {
+                let scope_decorated_tag = match *scope {
                     region::CodeExtentData::Misc(_) => tag,
                     region::CodeExtentData::CallSiteScope { .. } => {
                         "scope of call-site for function"
@@ -183,7 +184,8 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
                     }
                 };
 
-                let node = fr.scope.node_id(&self.region_maps);
+                let node = fr.scope.map(|s| s.node_id())
+                                   .unwrap_or(DUMMY_NODE_ID);
                 let unknown;
                 let tag = match self.hir.find(node) {
                     Some(hir_map::NodeBlock(_)) |
@@ -515,7 +517,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
                         values.1.push_normal("<");
                     }
 
-                    fn lifetime_display(lifetime: &Region) -> String {
+                    fn lifetime_display(lifetime: Region) -> String {
                         let s = format!("{}", lifetime);
                         if s.is_empty() {
                             "'_".to_string()
@@ -767,7 +769,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
     fn report_generic_bound_failure(&self,
                                     origin: SubregionOrigin<'tcx>,
                                     bound_kind: GenericKind<'tcx>,
-                                    sub: &'tcx Region)
+                                    sub: Region<'tcx>)
     {
         // FIXME: it would be better to report the first error message
         // with the span of the parameter itself, rather than the span
@@ -846,9 +848,9 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
     fn report_sub_sup_conflict(&self,
                                var_origin: RegionVariableOrigin,
                                sub_origin: SubregionOrigin<'tcx>,
-                               sub_region: &'tcx Region,
+                               sub_region: Region<'tcx>,
                                sup_origin: SubregionOrigin<'tcx>,
-                               sup_region: &'tcx Region) {
+                               sup_region: Region<'tcx>) {
         let mut err = self.report_inference_failure(var_origin);
 
         self.tcx.note_and_explain_region(&mut err,

src/librustc/infer/error_reporting/note.rs

@@ -146,8 +146,8 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
 
     pub(super) fn report_concrete_failure(&self,
                                           origin: SubregionOrigin<'tcx>,
-                                          sub: &'tcx Region,
-                                          sup: &'tcx Region)
+                                          sub: Region<'tcx>,
+                                          sup: Region<'tcx>)
                                           -> DiagnosticBuilder<'tcx> {
         match origin {
             infer::Subtype(trace) => {

src/librustc/infer/freshen.rs

@@ -83,7 +83,7 @@ impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for TypeFreshener<'a, 'gcx, 'tcx> {
         self.infcx.tcx
     }
 
-    fn fold_region(&mut self, r: &'tcx ty::Region) -> &'tcx ty::Region {
+    fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
         match *r {
             ty::ReEarlyBound(..) |
             ty::ReLateBound(..) => {

src/librustc/infer/fudge.rs

@@ -147,7 +147,7 @@ impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for RegionFudger<'a, 'gcx, 'tcx> {
         }
     }
 
-    fn fold_region(&mut self, r: &'tcx ty::Region) -> &'tcx ty::Region {
+    fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
         match *r {
             ty::ReVar(v) if self.region_vars.contains(&v) => {
                 self.infcx.next_region_var(self.origin.clone())

src/librustc/infer/glb.rs

@@ -59,8 +59,8 @@ impl<'combine, 'infcx, 'gcx, 'tcx> TypeRelation<'infcx, 'gcx, 'tcx>
         lattice::super_lattice_tys(self, a, b)
     }
 
-    fn regions(&mut self, a: &'tcx ty::Region, b: &'tcx ty::Region)
-               -> RelateResult<'tcx, &'tcx ty::Region> {
+    fn regions(&mut self, a: ty::Region<'tcx>, b: ty::Region<'tcx>)
+               -> RelateResult<'tcx, ty::Region<'tcx>> {
         debug!("{}.regions({:?}, {:?})",
                self.tag(),
                a,