rustc: remove some unnecessary lifetimes in -> TyCtxt methods.

src/librustc/lint/context.rs

@@ -793,7 +793,7 @@ impl<'a, 'tcx> LateContext<'a, 'tcx> {
             type DynExistential = ();
             type Const = ();
 
-            fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx> {
+            fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
                 self.tcx
             }
 

src/librustc/mir/interpret/mod.rs

@@ -144,7 +144,7 @@ pub struct AllocDecodingSession<'s> {
 impl<'s> AllocDecodingSession<'s> {
 
     // Decodes an AllocId in a thread-safe way.
-    pub fn decode_alloc_id<'tcx, D>(&self,
+    pub fn decode_alloc_id<D>(&self,
                                         decoder: &mut D)
                                         -> Result<AllocId, D::Error>
         where D: TyDecoder<'tcx>,

src/librustc/traits/query/normalize_erasing_regions.rs

@@ -68,7 +68,7 @@ struct NormalizeAfterErasingRegionsFolder<'tcx> {
 }
 
 impl TypeFolder<'tcx, 'tcx> for NormalizeAfterErasingRegionsFolder<'tcx> {
-    fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }
 

src/librustc/ty/codec.rs

@@ -131,38 +131,34 @@ pub trait TyDecoder<'tcx>: Decoder {
 }
 
 #[inline]
-pub fn decode_arena_allocable<'a, 'tcx, D, T: ArenaAllocatable + Decodable>(
+pub fn decode_arena_allocable<D, T: ArenaAllocatable + Decodable>(
     decoder: &mut D
 ) -> Result<&'tcx T, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     Ok(decoder.tcx().arena.alloc(Decodable::decode(decoder)?))
 }
 
 #[inline]
-pub fn decode_arena_allocable_slice<'a, 'tcx, D, T: ArenaAllocatable + Decodable>(
+pub fn decode_arena_allocable_slice<D, T: ArenaAllocatable + Decodable>(
     decoder: &mut D
 ) -> Result<&'tcx [T], D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     Ok(decoder.tcx().arena.alloc_from_iter(<Vec<T> as Decodable>::decode(decoder)?))
 }
 
 #[inline]
-pub fn decode_cnum<'a, 'tcx, D>(decoder: &mut D) -> Result<CrateNum, D::Error>
+pub fn decode_cnum<D>(decoder: &mut D) -> Result<CrateNum, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     let cnum = CrateNum::from_u32(u32::decode(decoder)?);
     Ok(decoder.map_encoded_cnum_to_current(cnum))
 }
 
 #[inline]
-pub fn decode_ty<'a, 'tcx, D>(decoder: &mut D) -> Result<Ty<'tcx>, D::Error>
+pub fn decode_ty<D>(decoder: &mut D) -> Result<Ty<'tcx>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     // Handle shorthands first, if we have an usize > 0x80.
     if decoder.positioned_at_shorthand() {
@@ -180,10 +176,9 @@ pub fn decode_ty<'a, 'tcx, D>(decoder: &mut D) -> Result<Ty<'tcx>, D::Error>
 }
 
 #[inline]
-pub fn decode_predicates<'a, 'tcx, D>(decoder: &mut D)
+pub fn decode_predicates<D>(decoder: &mut D)
                                       -> Result<ty::GenericPredicates<'tcx>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     Ok(ty::GenericPredicates {
         parent: Decodable::decode(decoder)?,
@@ -205,9 +200,8 @@ pub fn decode_predicates<'a, 'tcx, D>(decoder: &mut D)
 }
 
 #[inline]
-pub fn decode_substs<'a, 'tcx, D>(decoder: &mut D) -> Result<SubstsRef<'tcx>, D::Error>
+pub fn decode_substs<D>(decoder: &mut D) -> Result<SubstsRef<'tcx>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     let len = decoder.read_usize()?;
     let tcx = decoder.tcx();
@@ -215,38 +209,34 @@ pub fn decode_substs<'a, 'tcx, D>(decoder: &mut D) -> Result<SubstsRef<'tcx>, D:
 }
 
 #[inline]
-pub fn decode_region<'a, 'tcx, D>(decoder: &mut D) -> Result<ty::Region<'tcx>, D::Error>
+pub fn decode_region<D>(decoder: &mut D) -> Result<ty::Region<'tcx>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     Ok(decoder.tcx().mk_region(Decodable::decode(decoder)?))
 }
 
 #[inline]
-pub fn decode_ty_slice<'a, 'tcx, D>(decoder: &mut D)
+pub fn decode_ty_slice<D>(decoder: &mut D)
                                     -> Result<&'tcx ty::List<Ty<'tcx>>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     let len = decoder.read_usize()?;
     Ok(decoder.tcx().mk_type_list((0..len).map(|_| Decodable::decode(decoder)))?)
 }
 
 #[inline]
-pub fn decode_adt_def<'a, 'tcx, D>(decoder: &mut D)
+pub fn decode_adt_def<D>(decoder: &mut D)
                                    -> Result<&'tcx ty::AdtDef, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     let def_id = DefId::decode(decoder)?;
     Ok(decoder.tcx().adt_def(def_id))
 }
 
 #[inline]
-pub fn decode_existential_predicate_slice<'a, 'tcx, D>(decoder: &mut D)
+pub fn decode_existential_predicate_slice<D>(decoder: &mut D)
     -> Result<&'tcx ty::List<ty::ExistentialPredicate<'tcx>>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     let len = decoder.read_usize()?;
     Ok(decoder.tcx()
@@ -254,10 +244,9 @@ pub fn decode_existential_predicate_slice<'a, 'tcx, D>(decoder: &mut D)
 }
 
 #[inline]
-pub fn decode_canonical_var_infos<'a, 'tcx, D>(decoder: &mut D)
+pub fn decode_canonical_var_infos<D>(decoder: &mut D)
     -> Result<CanonicalVarInfos<'tcx>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     let len = decoder.read_usize()?;
     let interned: Result<Vec<CanonicalVarInfo>, _> = (0..len).map(|_| Decodable::decode(decoder))
@@ -267,19 +256,17 @@ pub fn decode_canonical_var_infos<'a, 'tcx, D>(decoder: &mut D)
 }
 
 #[inline]
-pub fn decode_const<'a, 'tcx, D>(decoder: &mut D)
+pub fn decode_const<D>(decoder: &mut D)
                                  -> Result<&'tcx ty::Const<'tcx>, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     Ok(decoder.tcx().mk_const(Decodable::decode(decoder)?))
 }
 
 #[inline]
-pub fn decode_allocation<'a, 'tcx, D>(decoder: &mut D)
+pub fn decode_allocation<D>(decoder: &mut D)
     -> Result<&'tcx Allocation, D::Error>
     where D: TyDecoder<'tcx>,
-          'tcx: 'a,
 {
     Ok(decoder.tcx().intern_const_alloc(Decodable::decode(decoder)?))
 }

src/librustc/ty/layout.rs

@@ -1727,7 +1727,7 @@ impl<'tcx> SizeSkeleton<'tcx> {
 }
 
 pub trait HasTyCtxt<'tcx>: HasDataLayout {
-    fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx>;
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx>;
 }
 
 pub trait HasParamEnv<'tcx> {
@@ -1741,7 +1741,7 @@ impl<'gcx, 'tcx> HasDataLayout for TyCtxt<'gcx, 'tcx> {
 }
 
 impl<'gcx, 'tcx> HasTyCtxt<'gcx> for TyCtxt<'gcx, 'tcx> {
-    fn tcx<'b>(&'b self) -> TyCtxt<'gcx, 'gcx> {
+    fn tcx(&self) -> TyCtxt<'gcx, 'gcx> {
         self.global_tcx()
     }
 }
@@ -1759,7 +1759,7 @@ impl<'tcx, T: HasDataLayout> HasDataLayout for LayoutCx<'tcx, T> {
 }
 
 impl<'gcx, 'tcx, T: HasTyCtxt<'gcx>> HasTyCtxt<'gcx> for LayoutCx<'tcx, T> {
-    fn tcx<'b>(&'b self) -> TyCtxt<'gcx, 'gcx> {
+    fn tcx(&self) -> TyCtxt<'gcx, 'gcx> {
         self.tcx.tcx()
     }
 }

src/librustc_codegen_llvm/builder.rs

@@ -66,7 +66,7 @@ impl ty::layout::HasDataLayout for Builder<'_, '_, '_> {
 }
 
 impl ty::layout::HasTyCtxt<'tcx> for Builder<'_, '_, 'tcx> {
-    fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.cx.tcx
     }
 }

src/librustc_codegen_llvm/context.rs

@@ -838,7 +838,7 @@ impl HasTargetSpec for CodegenCx<'ll, 'tcx> {
 }
 
 impl ty::layout::HasTyCtxt<'tcx> for CodegenCx<'ll, 'tcx> {
-    fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }
 }

src/librustc_codegen_utils/symbol_names/legacy.rs

@@ -203,7 +203,7 @@ impl Printer<'tcx, 'tcx> for SymbolPrinter<'tcx> {
     type DynExistential = Self;
     type Const = Self;
 
-    fn tcx(&'a self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }
 

src/librustc_codegen_utils/symbol_names/v0.rs

@@ -223,7 +223,7 @@ impl Printer<'tcx, 'tcx> for SymbolMangler<'tcx> {
     type DynExistential = Self;
     type Const = Self;
 
-    fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }
 

src/librustc_mir/interpret/eval_context.rs

@@ -173,7 +173,7 @@ impl<'mir, 'tcx, M> layout::HasTyCtxt<'tcx> for InterpretCx<'mir, 'tcx, M>
     where M: Machine<'mir, 'tcx>
 {
     #[inline]
-    fn tcx<'d>(&'d self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         *self.tcx
     }
 }

src/librustc_mir/interpret/intrinsics/type_name.rs

@@ -23,7 +23,7 @@ impl<'tcx> Printer<'tcx, 'tcx> for AbsolutePathPrinter<'tcx> {
     type DynExistential = Self;
     type Const = Self;
 
-    fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }
 

src/librustc_mir/transform/const_prop.rs

@@ -113,7 +113,7 @@ impl<'mir, 'tcx> HasDataLayout for ConstPropagator<'mir, 'tcx> {
 
 impl<'mir, 'tcx> HasTyCtxt<'tcx> for ConstPropagator<'mir, 'tcx> {
     #[inline]
-    fn tcx<'c>(&'c self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }
 }

src/librustc_passes/layout_test.rs

@@ -119,7 +119,7 @@ impl LayoutOf for UnwrapLayoutCx<'tcx> {
 }
 
 impl HasTyCtxt<'tcx> for UnwrapLayoutCx<'tcx> {
-    fn tcx<'a>(&'a self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }
 }

src/librustc_typeck/collect.rs

@@ -171,7 +171,7 @@ impl ItemCtxt<'tcx> {
 }
 
 impl AstConv<'tcx, 'tcx> for ItemCtxt<'tcx> {
-    fn tcx<'b>(&'b self) -> TyCtxt<'tcx, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx, 'tcx> {
         self.tcx
     }