Rollup merge of rust-lang#44560 - qmx:import-TyCtxt, r=eddyb

bring TyCtxt into scope

got comments both from @eddyb and @nikomatsakis (via rust-lang#44505) that we should always put `TyCtxt` in scope

should I just go and import it at other places in the codebase or we just keep doing small improvements?

src/librustc/ich/hcx.rs

@@ -13,7 +13,7 @@ use hir::def_id::DefId;
 use hir::map::DefPathHash;
 use ich::{self, CachingCodemapView};
 use session::config::DebugInfoLevel::NoDebugInfo;
-use ty;
+use ty::TyCtxt;
 use util::nodemap::{NodeMap, ItemLocalMap};
 
 use std::hash as std_hash;
@@ -34,7 +34,7 @@ use rustc_data_structures::accumulate_vec::AccumulateVec;
 /// a reference to the TyCtxt) and it holds a few caches for speeding up various
 /// things (e.g. each DefId/DefPath is only hashed once).
 pub struct StableHashingContext<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
-    tcx: ty::TyCtxt<'a, 'gcx, 'tcx>,
+    tcx: TyCtxt<'a, 'gcx, 'tcx>,
     codemap: CachingCodemapView<'gcx>,
     hash_spans: bool,
     hash_bodies: bool,
@@ -53,7 +53,7 @@ pub enum NodeIdHashingMode {
 
 impl<'a, 'gcx, 'tcx> StableHashingContext<'a, 'gcx, 'tcx> {
 
-    pub fn new(tcx: ty::TyCtxt<'a, 'gcx, 'tcx>) -> Self {
+    pub fn new(tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Self {
         let hash_spans_initial = tcx.sess.opts.debuginfo != NoDebugInfo;
         let check_overflow_initial = tcx.sess.overflow_checks();
 
@@ -111,7 +111,7 @@ impl<'a, 'gcx, 'tcx> StableHashingContext<'a, 'gcx, 'tcx> {
     }
 
     #[inline]
-    pub fn tcx(&self) -> ty::TyCtxt<'a, 'gcx, 'tcx> {
+    pub fn tcx(&self) -> TyCtxt<'a, 'gcx, 'tcx> {
         self.tcx
     }
 

src/librustc/infer/error_reporting/mod.rs

@@ -66,7 +66,7 @@ use hir::map as hir_map;
 use hir::def_id::DefId;
 use middle::region;
 use traits::{ObligationCause, ObligationCauseCode};
-use ty::{self, Region, TyCtxt, TypeFoldable};
+use ty::{self, Region, Ty, TyCtxt, TypeFoldable};
 use ty::error::TypeError;
 use syntax::ast::DUMMY_NODE_ID;
 use syntax_pos::{Pos, Span};
@@ -418,7 +418,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
                        name: String,
                        sub: &ty::subst::Substs<'tcx>,
                        pos: usize,
-                       other_ty: &ty::Ty<'tcx>) {
+                       other_ty: &Ty<'tcx>) {
         // `value` and `other_value` hold two incomplete type representation for display.
         // `name` is the path of both types being compared. `sub`
         value.push_highlighted(name);
@@ -491,7 +491,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
                     path: String,
                     sub: &ty::subst::Substs<'tcx>,
                     other_path: String,
-                    other_ty: &ty::Ty<'tcx>) -> Option<()> {
+                    other_ty: &Ty<'tcx>) -> Option<()> {
         for (i, ta) in sub.types().enumerate() {
             if &ta == other_ty {
                 self.highlight_outer(&mut t1_out, &mut t2_out, path, sub, i, &other_ty);
@@ -522,7 +522,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
 
     /// Compare two given types, eliding parts that are the same between them and highlighting
     /// relevant differences, and return two representation of those types for highlighted printing.
-    fn cmp(&self, t1: ty::Ty<'tcx>, t2: ty::Ty<'tcx>)
+    fn cmp(&self, t1: Ty<'tcx>, t2: Ty<'tcx>)
         -> (DiagnosticStyledString, DiagnosticStyledString)
     {
         match (&t1.sty, &t2.sty) {
@@ -743,7 +743,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
     }
 
     fn expected_found_str_ty(&self,
-                             exp_found: &ty::error::ExpectedFound<ty::Ty<'tcx>>)
+                             exp_found: &ty::error::ExpectedFound<Ty<'tcx>>)
                              -> Option<(DiagnosticStyledString, DiagnosticStyledString)> {
         let exp_found = self.resolve_type_vars_if_possible(exp_found);
         if exp_found.references_error() {

src/librustc/infer/error_reporting/util.rs

@@ -12,7 +12,7 @@
 //! anonymous regions.
 use hir;
 use infer::InferCtxt;
-use ty::{self, Region};
+use ty::{self, Region, Ty};
 use hir::def_id::DefId;
 use hir::map as hir_map;
 
@@ -35,7 +35,7 @@ pub struct AnonymousArgInfo<'tcx> {
     // the argument corresponding to the anonymous region
     pub arg: &'tcx hir::Arg,
     // the type corresponding to the anonymopus region argument
-    pub arg_ty: ty::Ty<'tcx>,
+    pub arg_ty: Ty<'tcx>,
     // the ty::BoundRegion corresponding to the anonymous region
     pub bound_region: ty::BoundRegion,
     // corresponds to id the argument is the first parameter

src/librustc/infer/mod.rs

@@ -644,7 +644,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
         }
     }
 
-    pub fn unsolved_variables(&self) -> Vec<ty::Ty<'tcx>> {
+    pub fn unsolved_variables(&self) -> Vec<Ty<'tcx>> {
         let mut variables = Vec::new();
 
         let unbound_ty_vars = self.type_variables

src/librustc/middle/lang_items.rs

@@ -315,7 +315,7 @@ language_item_table! {
     DebugTraitLangItem,              "debug_trait",             debug_trait;
 }
 
-impl<'a, 'tcx, 'gcx> ty::TyCtxt<'a, 'tcx, 'gcx> {
+impl<'a, 'tcx, 'gcx> TyCtxt<'a, 'tcx, 'gcx> {
     pub fn require_lang_item(&self, lang_item: LangItem) -> DefId {
         self.lang_items().require(lang_item).unwrap_or_else(|msg| {
             self.sess.fatal(&msg)

src/librustc/mir/mod.rs

@@ -21,7 +21,7 @@ use rustc_data_structures::control_flow_graph::ControlFlowGraph;
 use hir::def::CtorKind;
 use hir::def_id::DefId;
 use ty::subst::{Subst, Substs};
-use ty::{self, AdtDef, ClosureSubsts, Region, Ty, GeneratorInterior};
+use ty::{self, AdtDef, ClosureSubsts, Region, Ty, TyCtxt, GeneratorInterior};
 use ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
 use util::ppaux;
 use rustc_back::slice;
@@ -644,7 +644,7 @@ impl<'tcx> Terminator<'tcx> {
 }
 
 impl<'tcx> TerminatorKind<'tcx> {
-    pub fn if_<'a, 'gcx>(tcx: ty::TyCtxt<'a, 'gcx, 'tcx>, cond: Operand<'tcx>,
+    pub fn if_<'a, 'gcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>, cond: Operand<'tcx>,
                          t: BasicBlock, f: BasicBlock) -> TerminatorKind<'tcx> {
         static BOOL_SWITCH_FALSE: &'static [ConstInt] = &[ConstInt::U8(0)];
         TerminatorKind::SwitchInt {
@@ -1182,7 +1182,7 @@ impl<'tcx> Debug for Operand<'tcx> {
 
 impl<'tcx> Operand<'tcx> {
     pub fn function_handle<'a>(
-        tcx: ty::TyCtxt<'a, 'tcx, 'tcx>,
+        tcx: TyCtxt<'a, 'tcx, 'tcx>,
         def_id: DefId,
         substs: &'tcx Substs<'tcx>,
         span: Span,

src/librustc/traits/mod.rs

@@ -381,7 +381,7 @@ pub struct VtableObjectData<'tcx, N> {
 
 #[derive(Clone, PartialEq, Eq)]
 pub struct VtableFnPointerData<'tcx, N> {
-    pub fn_ty: ty::Ty<'tcx>,
+    pub fn_ty: Ty<'tcx>,
     pub nested: Vec<N>
 }
 

src/librustc/ty/instance.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 use hir::def_id::DefId;
-use ty::{self, Ty, TypeFoldable, Substs};
+use ty::{self, Ty, TypeFoldable, Substs, TyCtxt};
 use util::ppaux;
 
 use std::fmt;
@@ -57,12 +57,12 @@ impl<'tcx> InstanceDef<'tcx> {
     }
 
     #[inline]
-    pub fn def_ty<'a>(&self, tcx: ty::TyCtxt<'a, 'tcx, 'tcx>) -> Ty<'tcx> {
+    pub fn def_ty<'a>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Ty<'tcx> {
         tcx.type_of(self.def_id())
     }
 
     #[inline]
-    pub fn attrs<'a>(&self, tcx: ty::TyCtxt<'a, 'tcx, 'tcx>) -> ty::Attributes<'tcx> {
+    pub fn attrs<'a>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> ty::Attributes<'tcx> {
         tcx.get_attrs(self.def_id())
     }
 }
@@ -103,7 +103,7 @@ impl<'a, 'b, 'tcx> Instance<'tcx> {
         Instance { def: InstanceDef::Item(def_id), substs: substs }
     }
 
-    pub fn mono(tcx: ty::TyCtxt<'a, 'tcx, 'b>, def_id: DefId) -> Instance<'tcx> {
+    pub fn mono(tcx: TyCtxt<'a, 'tcx, 'b>, def_id: DefId) -> Instance<'tcx> {
         Instance::new(def_id, tcx.global_tcx().empty_substs_for_def_id(def_id))
     }
 

src/librustc/ty/layout.rs

@@ -386,7 +386,7 @@ impl Integer {
         }
     }
 
-    pub fn to_ty<'a, 'tcx>(&self, tcx: &ty::TyCtxt<'a, 'tcx, 'tcx>,
+    pub fn to_ty<'a, 'tcx>(&self, tcx: &TyCtxt<'a, 'tcx, 'tcx>,
                            signed: bool) -> Ty<'tcx> {
         match (*self, signed) {
             (I1, false) => tcx.types.u8,

src/librustc_borrowck/borrowck/mod.rs

@@ -34,7 +34,7 @@ use rustc::middle::mem_categorization::Categorization;
 use rustc::middle::mem_categorization::ImmutabilityBlame;
 use rustc::middle::region;
 use rustc::middle::free_region::RegionRelations;
-use rustc::ty::{self, TyCtxt};
+use rustc::ty::{self, Ty, TyCtxt};
 use rustc::ty::maps::Providers;
 use rustc_mir::util::borrowck_errors::{BorrowckErrors, Origin};
 
@@ -275,7 +275,7 @@ impl<'tcx> Loan<'tcx> {
 #[derive(Eq)]
 pub struct LoanPath<'tcx> {
     kind: LoanPathKind<'tcx>,
-    ty: ty::Ty<'tcx>,
+    ty: Ty<'tcx>,
 }
 
 impl<'tcx> PartialEq for LoanPath<'tcx> {
@@ -299,11 +299,11 @@ pub enum LoanPathKind<'tcx> {
 }
 
 impl<'tcx> LoanPath<'tcx> {
-    fn new(kind: LoanPathKind<'tcx>, ty: ty::Ty<'tcx>) -> LoanPath<'tcx> {
+    fn new(kind: LoanPathKind<'tcx>, ty: Ty<'tcx>) -> LoanPath<'tcx> {
         LoanPath { kind: kind, ty: ty }
     }
 
-    fn to_type(&self) -> ty::Ty<'tcx> { self.ty }
+    fn to_type(&self) -> Ty<'tcx> { self.ty }
 }
 
 // FIXME (pnkfelix): See discussion here

src/librustc_metadata/astencode.rs

@@ -14,7 +14,7 @@ use isolated_encoder::IsolatedEncoder;
 use schema::*;
 
 use rustc::hir;
-use rustc::ty;
+use rustc::ty::{self, TyCtxt};
 
 #[derive(RustcEncodable, RustcDecodable)]
 pub struct Ast<'tcx> {
@@ -59,7 +59,7 @@ impl<'a, 'b, 'tcx> IsolatedEncoder<'a, 'b, 'tcx> {
 }
 
 struct NestedBodyCollector<'a, 'tcx: 'a> {
-    tcx: ty::TyCtxt<'a, 'tcx, 'tcx>,
+    tcx: TyCtxt<'a, 'tcx, 'tcx>,
     bodies_found: Vec<&'tcx hir::Body>,
 }
 

src/librustc_mir/build/cfg.rs

@@ -16,7 +16,7 @@
 use build::CFG;
 use rustc::middle::region;
 use rustc::mir::*;
-use rustc::ty;
+use rustc::ty::TyCtxt;
 
 impl<'tcx> CFG<'tcx> {
     pub fn block_data(&self, blk: BasicBlock) -> &BasicBlockData<'tcx> {
@@ -46,7 +46,7 @@ impl<'tcx> CFG<'tcx> {
     }
 
     pub fn push_end_region<'a, 'gcx:'a+'tcx>(&mut self,
-                                             tcx: ty::TyCtxt<'a, 'gcx, 'tcx>,
+                                             tcx: TyCtxt<'a, 'gcx, 'tcx>,
                                              block: BasicBlock,
                                              source_info: SourceInfo,
                                              region_scope: region::Scope) {

src/librustc_mir/build/expr/as_rvalue.rs

@@ -22,7 +22,7 @@ use hair::*;
 use rustc_const_math::{ConstInt, ConstIsize};
 use rustc::middle::const_val::ConstVal;
 use rustc::middle::region;
-use rustc::ty;
+use rustc::ty::{self, Ty};
 use rustc::mir::*;
 use syntax::ast;
 use syntax_pos::Span;
@@ -291,7 +291,7 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
     }
 
     pub fn build_binary_op(&mut self, mut block: BasicBlock,
-                           op: BinOp, span: Span, ty: ty::Ty<'tcx>,
+                           op: BinOp, span: Span, ty: Ty<'tcx>,
                            lhs: Operand<'tcx>, rhs: Operand<'tcx>) -> BlockAnd<Rvalue<'tcx>> {
         let source_info = self.source_info(span);
         let bool_ty = self.hir.bool_ty();
@@ -378,7 +378,7 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
     }
 
     // Helper to get a `-1` value of the appropriate type
-    fn neg_1_literal(&mut self, span: Span, ty: ty::Ty<'tcx>) -> Operand<'tcx> {
+    fn neg_1_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> {
         let literal = match ty.sty {
             ty::TyInt(ity) => {
                 let val = match ity {
@@ -410,7 +410,7 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
     }
 
     // Helper to get the minimum value of the appropriate type
-    fn minval_literal(&mut self, span: Span, ty: ty::Ty<'tcx>) -> Operand<'tcx> {
+    fn minval_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> {
         let literal = match ty.sty {
             ty::TyInt(ity) => {
                 let val = match ity {

src/librustc_mir/hair/mod.rs

@@ -19,7 +19,7 @@ use rustc::mir::{BinOp, BorrowKind, Field, Literal, UnOp};
 use rustc::hir::def_id::DefId;
 use rustc::middle::region;
 use rustc::ty::subst::Substs;
-use rustc::ty::{self, AdtDef, ClosureSubsts, Region, Ty, GeneratorInterior};
+use rustc::ty::{AdtDef, ClosureSubsts, Region, Ty, GeneratorInterior};
 use rustc::hir;
 use syntax::ast;
 use syntax_pos::Span;
@@ -117,7 +117,7 @@ pub enum ExprKind<'tcx> {
         value: ExprRef<'tcx>,
     },
     Call {
-        ty: ty::Ty<'tcx>,
+        ty: Ty<'tcx>,
         fun: ExprRef<'tcx>,
         args: Vec<ExprRef<'tcx>>,
     },