Remove the type parameter from `syntax::visit::Visitor`

19 files changed, 169 insertions, 188 deletions

diff --git a/src/librustc/hir/check_attr.rs b/src/librustc/hir/check_attr.rs
index 085acc198d1..a1c04dfcab5 100644
--- a/src/librustc/hir/check_attr.rs
+++ b/src/librustc/hir/check_attr.rs
@@ -95,7 +95,7 @@ impl<'a> CheckAttrVisitor<'a> {
     }
 }
 
-impl<'a, 'v> Visitor<'v> for CheckAttrVisitor<'a> {
+impl<'a> Visitor for CheckAttrVisitor<'a> {
     fn visit_item(&mut self, item: &ast::Item) {
         let target = Target::from_item(item);
         for attr in &item.attrs {
diff --git a/src/librustc/hir/lowering.rs b/src/librustc/hir/lowering.rs
index 69cf5baa26f..8841f4ad39a 100644
--- a/src/librustc/hir/lowering.rs
+++ b/src/librustc/hir/lowering.rs
@@ -138,8 +138,8 @@ impl<'a> LoweringContext<'a> {
             lctx: &'lcx mut LoweringContext<'interner>,
         }
 
-        impl<'lcx, 'interner> Visitor<'lcx> for ItemLowerer<'lcx, 'interner> {
-            fn visit_item(&mut self, item: &'lcx Item) {
+        impl<'lcx, 'interner> Visitor for ItemLowerer<'lcx, 'interner> {
+            fn visit_item(&mut self, item: &Item) {
                 self.items.insert(item.id, self.lctx.lower_item(item));
                 visit::walk_item(self, item);
             }
diff --git a/src/librustc/hir/map/def_collector.rs b/src/librustc/hir/map/def_collector.rs
index e3b6539b8cc..5afe8cbaff7 100644
--- a/src/librustc/hir/map/def_collector.rs
+++ b/src/librustc/hir/map/def_collector.rs
@@ -98,7 +98,7 @@ impl<'ast> DefCollector<'ast> {
         self.parent_def = parent;
     }
 
-    fn visit_ast_const_integer(&mut self, expr: &'ast Expr) {
+    fn visit_ast_const_integer(&mut self, expr: &Expr) {
         // Find the node which will be used after lowering.
         if let ExprKind::Paren(ref inner) = expr.node {
             return self.visit_ast_const_integer(inner);
@@ -124,8 +124,8 @@ impl<'ast> DefCollector<'ast> {
     }
 }
 
-impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
-    fn visit_item(&mut self, i: &'ast Item) {
+impl<'ast> visit::Visitor for DefCollector<'ast> {
+    fn visit_item(&mut self, i: &Item) {
         debug!("visit_item: {:?}", i);
 
         // Pick the def data. This need not be unique, but the more
@@ -183,7 +183,7 @@ impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
         });
     }
 
-    fn visit_foreign_item(&mut self, foreign_item: &'ast ForeignItem) {
+    fn visit_foreign_item(&mut self, foreign_item: &ForeignItem) {
         let def = self.create_def(foreign_item.id, DefPathData::ValueNs(foreign_item.ident.name));
 
         self.with_parent(def, |this| {
@@ -191,7 +191,7 @@ impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
         });
     }
 
-    fn visit_generics(&mut self, generics: &'ast Generics) {
+    fn visit_generics(&mut self, generics: &Generics) {
         for ty_param in generics.ty_params.iter() {
             self.create_def(ty_param.id, DefPathData::TypeParam(ty_param.ident.name));
         }
@@ -199,7 +199,7 @@ impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
         visit::walk_generics(self, generics);
     }
 
-    fn visit_trait_item(&mut self, ti: &'ast TraitItem) {
+    fn visit_trait_item(&mut self, ti: &TraitItem) {
         let def_data = match ti.node {
             TraitItemKind::Method(..) | TraitItemKind::Const(..) =>
                 DefPathData::ValueNs(ti.ident.name),
@@ -216,7 +216,7 @@ impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
         });
     }
 
-    fn visit_impl_item(&mut self, ii: &'ast ImplItem) {
+    fn visit_impl_item(&mut self, ii: &ImplItem) {
         let def_data = match ii.node {
             ImplItemKind::Method(..) | ImplItemKind::Const(..) =>
                 DefPathData::ValueNs(ii.ident.name),
@@ -234,7 +234,7 @@ impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
         });
     }
 
-    fn visit_pat(&mut self, pat: &'ast Pat) {
+    fn visit_pat(&mut self, pat: &Pat) {
         let parent_def = self.parent_def;
 
         if let PatKind::Ident(_, id, _) = pat.node {
@@ -246,7 +246,7 @@ impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
         self.parent_def = parent_def;
     }
 
-    fn visit_expr(&mut self, expr: &'ast Expr) {
+    fn visit_expr(&mut self, expr: &Expr) {
         let parent_def = self.parent_def;
 
         if let ExprKind::Repeat(_, ref count) = expr.node {
@@ -262,18 +262,18 @@ impl<'ast> visit::Visitor<'ast> for DefCollector<'ast> {
         self.parent_def = parent_def;
     }
 
-    fn visit_ty(&mut self, ty: &'ast Ty) {
+    fn visit_ty(&mut self, ty: &Ty) {
         if let TyKind::FixedLengthVec(_, ref length) = ty.node {
             self.visit_ast_const_integer(length);
         }
         visit::walk_ty(self, ty);
     }
 
-    fn visit_lifetime_def(&mut self, def: &'ast LifetimeDef) {
+    fn visit_lifetime_def(&mut self, def: &LifetimeDef) {
         self.create_def(def.lifetime.id, DefPathData::LifetimeDef(def.lifetime.name));
     }
 
-    fn visit_macro_def(&mut self, macro_def: &'ast MacroDef) {
+    fn visit_macro_def(&mut self, macro_def: &MacroDef) {
         self.create_def(macro_def.id, DefPathData::MacroDef(macro_def.ident.name));
     }
 }
diff --git a/src/librustc/lint/context.rs b/src/librustc/lint/context.rs
index 94f17ea779a..9ebf4dfa017 100644
--- a/src/librustc/lint/context.rs
+++ b/src/librustc/lint/context.rs
@@ -905,7 +905,7 @@ impl<'a, 'tcx, 'v> hir_visit::Visitor<'v> for LateContext<'a, 'tcx> {
     }
 }
 
-impl<'a, 'v> ast_visit::Visitor<'v> for EarlyContext<'a> {
+impl<'a> ast_visit::Visitor for EarlyContext<'a> {
     fn visit_item(&mut self, it: &ast::Item) {
         self.with_lint_attrs(&it.attrs, |cx| {
             run_lints!(cx, check_item, early_passes, it);
@@ -939,8 +939,8 @@ impl<'a, 'v> ast_visit::Visitor<'v> for EarlyContext<'a> {
         ast_visit::walk_stmt(self, s);
     }
 
-    fn visit_fn(&mut self, fk: ast_visit::FnKind<'v>, decl: &'v ast::FnDecl,
-                body: &'v ast::Block, span: Span, id: ast::NodeId) {
+    fn visit_fn(&mut self, fk: ast_visit::FnKind, decl: &ast::FnDecl,
+                body: &ast::Block, span: Span, id: ast::NodeId) {
         run_lints!(self, check_fn, early_passes, fk, decl, body, span, id);
         ast_visit::walk_fn(self, fk, decl, body, span);
         run_lints!(self, check_fn_post, early_passes, fk, decl, body, span, id);
diff --git a/src/librustc_metadata/creader.rs b/src/librustc_metadata/creader.rs
index 2025045cc8f..31024ee8eca 100644
--- a/src/librustc_metadata/creader.rs
+++ b/src/librustc_metadata/creader.rs
@@ -58,8 +58,8 @@ pub struct CrateReader<'a> {
     local_crate_name: String,
 }
 
-impl<'a, 'ast> visit::Visitor<'ast> for LocalCrateReader<'a> {
-    fn visit_item(&mut self, a: &'ast ast::Item) {
+impl<'a> visit::Visitor for LocalCrateReader<'a> {
+    fn visit_item(&mut self, a: &ast::Item) {
         self.process_item(a);
         visit::walk_item(self, a);
     }
diff --git a/src/librustc_passes/ast_validation.rs b/src/librustc_passes/ast_validation.rs
index 919c717f888..4dd54beba38 100644
--- a/src/librustc_passes/ast_validation.rs
+++ b/src/librustc_passes/ast_validation.rs
@@ -57,7 +57,7 @@ impl<'a> AstValidator<'a> {
     }
 }
 
-impl<'a, 'v> Visitor<'v> for AstValidator<'a> {
+impl<'a> Visitor for AstValidator<'a> {
     fn visit_lifetime(&mut self, lt: &Lifetime) {
         if lt.name.as_str() == "'_" {
             self.session.add_lint(
diff --git a/src/librustc_passes/no_asm.rs b/src/librustc_passes/no_asm.rs
index 90f92c25b05..314513a974e 100644
--- a/src/librustc_passes/no_asm.rs
+++ b/src/librustc_passes/no_asm.rs
@@ -29,7 +29,7 @@ struct CheckNoAsm<'a> {
     sess: &'a Session,
 }
 
-impl<'a, 'v> Visitor<'v> for CheckNoAsm<'a> {
+impl<'a> Visitor for CheckNoAsm<'a> {
     fn visit_expr(&mut self, e: &ast::Expr) {
         match e.node {
             ast::ExprKind::InlineAsm(_) => span_err!(self.sess, e.span, E0472,
diff --git a/src/librustc_resolve/build_reduced_graph.rs b/src/librustc_resolve/build_reduced_graph.rs
index 775c24b6d4a..88123f66c1a 100644
--- a/src/librustc_resolve/build_reduced_graph.rs
+++ b/src/librustc_resolve/build_reduced_graph.rs
@@ -503,7 +503,7 @@ struct BuildReducedGraphVisitor<'a, 'b: 'a> {
     parent: Module<'b>,
 }
 
-impl<'a, 'b, 'v> Visitor<'v> for BuildReducedGraphVisitor<'a, 'b> {
+impl<'a, 'b> Visitor for BuildReducedGraphVisitor<'a, 'b> {
     fn visit_item(&mut self, item: &Item) {
         let old_parent = self.parent;
         self.resolver.build_reduced_graph_for_item(item, &mut self.parent);
diff --git a/src/librustc_resolve/check_unused.rs b/src/librustc_resolve/check_unused.rs
index 64347d7b84d..7fa363c92be 100644
--- a/src/librustc_resolve/check_unused.rs
+++ b/src/librustc_resolve/check_unused.rs
@@ -71,7 +71,7 @@ impl<'a, 'b> UnusedImportCheckVisitor<'a, 'b> {
     }
 }
 
-impl<'a, 'b, 'v> Visitor<'v> for UnusedImportCheckVisitor<'a, 'b> {
+impl<'a, 'b> Visitor for UnusedImportCheckVisitor<'a, 'b> {
     fn visit_item(&mut self, item: &ast::Item) {
         visit::walk_item(self, item);
         // Ignore is_public import statements because there's no way to be sure
diff --git a/src/librustc_resolve/lib.rs b/src/librustc_resolve/lib.rs
index 377863b016d..554cf1b6c85 100644
--- a/src/librustc_resolve/lib.rs
+++ b/src/librustc_resolve/lib.rs
@@ -500,7 +500,7 @@ pub enum Namespace {
     ValueNS,
 }
 
-impl<'a, 'v> Visitor<'v> for Resolver<'a> {
+impl<'a> Visitor for Resolver<'a> {
     fn visit_item(&mut self, item: &Item) {
         self.resolve_item(item);
     }
@@ -562,9 +562,9 @@ impl<'a, 'v> Visitor<'v> for Resolver<'a> {
         });
     }
     fn visit_fn(&mut self,
-                function_kind: FnKind<'v>,
-                declaration: &'v FnDecl,
-                block: &'v Block,
+                function_kind: FnKind,
+                declaration: &FnDecl,
+                block: &Block,
                 _: Span,
                 node_id: NodeId) {
         let rib_kind = match function_kind {
diff --git a/src/librustc_save_analysis/dump_visitor.rs b/src/librustc_save_analysis/dump_visitor.rs
index 216d188a503..044e611ca34 100644
--- a/src/librustc_save_analysis/dump_visitor.rs
+++ b/src/librustc_save_analysis/dump_visitor.rs
@@ -1013,7 +1013,7 @@ impl<'l, 'tcx: 'l, 'll, D: Dump + 'll> DumpVisitor<'l, 'tcx, 'll, D> {
     }
 }
 
-impl<'v, 'l, 'tcx: 'l, 'll, D: Dump +'ll> Visitor<'v> for DumpVisitor<'l, 'tcx, 'll, D> {
+impl<'l, 'tcx: 'l, 'll, D: Dump +'ll> Visitor for DumpVisitor<'l, 'tcx, 'll, D> {
     fn visit_item(&mut self, item: &ast::Item) {
         use syntax::ast::ItemKind::*;
         self.process_macro_use(item.span, item.id);
diff --git a/src/librustc_save_analysis/lib.rs b/src/librustc_save_analysis/lib.rs
index 27f15756a91..203225035e0 100644
--- a/src/librustc_save_analysis/lib.rs
+++ b/src/librustc_save_analysis/lib.rs
@@ -686,7 +686,7 @@ impl PathCollector {
     }
 }
 
-impl<'v> Visitor<'v> for PathCollector {
+impl Visitor for PathCollector {
     fn visit_pat(&mut self, p: &ast::Pat) {
         match p.node {
             PatKind::Struct(ref path, _, _) => {
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index f803b942b8b..ff2683468e0 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -573,7 +573,7 @@ struct PatIdentFinder {
     ident_accumulator: Vec<ast::Ident>
 }
 
-impl<'v> Visitor<'v> for PatIdentFinder {
+impl Visitor for PatIdentFinder {
     fn visit_pat(&mut self, pattern: &ast::Pat) {
         match *pattern {
             ast::Pat { id: _, node: PatKind::Ident(_, ref path1, ref inner), span: _ } => {
@@ -1226,7 +1226,7 @@ mod tests {
         path_accumulator: Vec<ast::Path> ,
     }
 
-    impl<'v> Visitor<'v> for PathExprFinderContext {
+    impl Visitor for PathExprFinderContext {
         fn visit_expr(&mut self, expr: &ast::Expr) {
             if let ast::ExprKind::Path(None, ref p) = expr.node {
                 self.path_accumulator.push(p.clone());
@@ -1248,7 +1248,7 @@ mod tests {
         ident_accumulator: Vec<ast::Ident>
     }
 
-    impl<'v> Visitor<'v> for IdentFinder {
+    impl Visitor for IdentFinder {
         fn visit_ident(&mut self, _: codemap::Span, id: ast::Ident){
             self.ident_accumulator.push(id);
         }
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 86c4a33896d..2ac394021df 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -849,7 +849,7 @@ macro_rules! gate_feature_post {
     }}
 }
 
-impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
+impl<'a> Visitor for PostExpansionVisitor<'a> {
     fn visit_attribute(&mut self, attr: &ast::Attribute) {
         if !self.context.cm.span_allows_unstable(attr.span) {
             self.context.check_attribute(attr, false);
@@ -1045,9 +1045,9 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
     }
 
     fn visit_fn(&mut self,
-                fn_kind: FnKind<'v>,
-                fn_decl: &'v ast::FnDecl,
-                block: &'v ast::Block,
+                fn_kind: FnKind,
+                fn_decl: &ast::FnDecl,
+                block: &ast::Block,
                 span: Span,
                 _node_id: NodeId) {
         // check for const fn declarations
@@ -1086,7 +1086,7 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
         visit::walk_fn(self, fn_kind, fn_decl, block, span);
     }
 
-    fn visit_trait_item(&mut self, ti: &'v ast::TraitItem) {
+    fn visit_trait_item(&mut self, ti: &ast::TraitItem) {
         match ti.node {
             ast::TraitItemKind::Const(..) => {
                 gate_feature_post!(&self, associated_consts,
@@ -1107,7 +1107,7 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
         visit::walk_trait_item(self, ti);
     }
 
-    fn visit_impl_item(&mut self, ii: &'v ast::ImplItem) {
+    fn visit_impl_item(&mut self, ii: &ast::ImplItem) {
         if ii.defaultness == ast::Defaultness::Default {
             gate_feature_post!(&self, specialization,
                               ii.span,
@@ -1130,7 +1130,7 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
         visit::walk_impl_item(self, ii);
     }
 
-    fn visit_vis(&mut self, vis: &'v ast::Visibility) {
+    fn visit_vis(&mut self, vis: &ast::Visibility) {
         let span = match *vis {
             ast::Visibility::Crate(span) => span,
             ast::Visibility::Restricted { ref path, .. } => path.span,
diff --git a/src/libsyntax/parse/mod.rs b/src/libsyntax/parse/mod.rs
index 4eb77a52f58..0d8a1599c6b 100644
--- a/src/libsyntax/parse/mod.rs
+++ b/src/libsyntax/parse/mod.rs
@@ -991,8 +991,8 @@ mod tests {
         struct PatIdentVisitor {
             spans: Vec<Span>
         }
-        impl<'v> ::visit::Visitor<'v> for PatIdentVisitor {
-            fn visit_pat(&mut self, p: &'v ast::Pat) {
+        impl ::visit::Visitor for PatIdentVisitor {
+            fn visit_pat(&mut self, p: &ast::Pat) {
                 match p.node {
                     PatKind::Ident(_ , ref spannedident, _) => {
                         self.spans.push(spannedident.span.clone());
diff --git a/src/libsyntax/show_span.rs b/src/libsyntax/show_span.rs
index 5e3cd0773aa..928ffb202d0 100644
--- a/src/libsyntax/show_span.rs
+++ b/src/libsyntax/show_span.rs
@@ -44,7 +44,7 @@ struct ShowSpanVisitor<'a> {
     mode: Mode,
 }
 
-impl<'a, 'v> Visitor<'v> for ShowSpanVisitor<'a> {
+impl<'a> Visitor for ShowSpanVisitor<'a> {
     fn visit_expr(&mut self, e: &ast::Expr) {
         if let Mode::Expression = self.mode {
             self.span_diagnostic.span_warn(e.span, "expression");
diff --git a/src/libsyntax/util/node_count.rs b/src/libsyntax/util/node_count.rs
index 919dd84b117..5d6f0323d8c 100644
--- a/src/libsyntax/util/node_count.rs
+++ b/src/libsyntax/util/node_count.rs
@@ -26,133 +26,133 @@ impl NodeCounter {
     }
 }
 
-impl<'v> Visitor<'v> for NodeCounter {
+impl Visitor for NodeCounter {
     fn visit_ident(&mut self, span: Span, ident: Ident) {
         self.count += 1;
         walk_ident(self, span, ident);
     }
-    fn visit_mod(&mut self, m: &'v Mod, _s: Span, _n: NodeId) {
+    fn visit_mod(&mut self, m: &Mod, _s: Span, _n: NodeId) {
         self.count += 1;
         walk_mod(self, m)
     }
-    fn visit_foreign_item(&mut self, i: &'v ForeignItem) {
+    fn visit_foreign_item(&mut self, i: &ForeignItem) {
         self.count += 1;
         walk_foreign_item(self, i)
     }
-    fn visit_item(&mut self, i: &'v Item) {
+    fn visit_item(&mut self, i: &Item) {
         self.count += 1;
         walk_item(self, i)
     }
-    fn visit_local(&mut self, l: &'v Local) {
+    fn visit_local(&mut self, l: &Local) {
         self.count += 1;
         walk_local(self, l)
     }
-    fn visit_block(&mut self, b: &'v Block) {
+    fn visit_block(&mut self, b: &Block) {
         self.count += 1;
         walk_block(self, b)
     }
-    fn visit_stmt(&mut self, s: &'v Stmt) {
+    fn visit_stmt(&mut self, s: &Stmt) {
         self.count += 1;
         walk_stmt(self, s)
     }
-    fn visit_arm(&mut self, a: &'v Arm) {
+    fn visit_arm(&mut self, a: &Arm) {
         self.count += 1;
         walk_arm(self, a)
     }
-    fn visit_pat(&mut self, p: &'v Pat) {
+    fn visit_pat(&mut self, p: &Pat) {
         self.count += 1;
         walk_pat(self, p)
     }
-    fn visit_decl(&mut self, d: &'v Decl) {
+    fn visit_decl(&mut self, d: &Decl) {
         self.count += 1;
         walk_decl(self, d)
     }
-    fn visit_expr(&mut self, ex: &'v Expr) {
+    fn visit_expr(&mut self, ex: &Expr) {
         self.count += 1;
         walk_expr(self, ex)
     }
-    fn visit_ty(&mut self, t: &'v Ty) {
+    fn visit_ty(&mut self, t: &Ty) {
         self.count += 1;
         walk_ty(self, t)
     }
-    fn visit_generics(&mut self, g: &'v Generics) {
+    fn visit_generics(&mut self, g: &Generics) {
         self.count += 1;
         walk_generics(self, g)
     }
-    fn visit_fn(&mut self, fk: FnKind<'v>, fd: &'v FnDecl, b: &'v Block, s: Span, _: NodeId) {
+    fn visit_fn(&mut self, fk: FnKind, fd: &FnDecl, b: &Block, s: Span, _: NodeId) {
         self.count += 1;
         walk_fn(self, fk, fd, b, s)
     }
-    fn visit_trait_item(&mut self, ti: &'v TraitItem) {
+    fn visit_trait_item(&mut self, ti: &TraitItem) {
         self.count += 1;
         walk_trait_item(self, ti)
     }
-    fn visit_impl_item(&mut self, ii: &'v ImplItem) {
+    fn visit_impl_item(&mut self, ii: &ImplItem) {
         self.count += 1;
         walk_impl_item(self, ii)
     }
-    fn visit_trait_ref(&mut self, t: &'v TraitRef) {
+    fn visit_trait_ref(&mut self, t: &TraitRef) {
         self.count += 1;
         walk_trait_ref(self, t)
     }
-    fn visit_ty_param_bound(&mut self, bounds: &'v TyParamBound) {
+    fn visit_ty_param_bound(&mut self, bounds: &TyParamBound) {
         self.count += 1;
         walk_ty_param_bound(self, bounds)
     }
-    fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef, m: &'v TraitBoundModifier) {
+    fn visit_poly_trait_ref(&mut self, t: &PolyTraitRef, m: &TraitBoundModifier) {
         self.count += 1;
         walk_poly_trait_ref(self, t, m)
     }
-    fn visit_variant_data(&mut self, s: &'v VariantData, _: Ident,
-                        _: &'v Generics, _: NodeId, _: Span) {
+    fn visit_variant_data(&mut self, s: &VariantData, _: Ident,
+                          _: &Generics, _: NodeId, _: Span) {
         self.count += 1;
         walk_struct_def(self, s)
     }
-    fn visit_struct_field(&mut self, s: &'v StructField) {
+    fn visit_struct_field(&mut self, s: &StructField) {
         self.count += 1;
         walk_struct_field(self, s)
     }
-    fn visit_enum_def(&mut self, enum_definition: &'v EnumDef,
-                      generics: &'v Generics, item_id: NodeId, _: Span) {
+    fn visit_enum_def(&mut self, enum_definition: &EnumDef,
+                      generics: &Generics, item_id: NodeId, _: Span) {
         self.count += 1;
         walk_enum_def(self, enum_definition, generics, item_id)
     }
-    fn visit_variant(&mut self, v: &'v Variant, g: &'v Generics, item_id: NodeId) {
+    fn visit_variant(&mut self, v: &Variant, g: &Generics, item_id: NodeId) {
         self.count += 1;
         walk_variant(self, v, g, item_id)
     }
-    fn visit_lifetime(&mut self, lifetime: &'v Lifetime) {
+    fn visit_lifetime(&mut self, lifetime: &Lifetime) {
         self.count += 1;
         walk_lifetime(self, lifetime)
     }
-    fn visit_lifetime_def(&mut self, lifetime: &'v LifetimeDef) {
+    fn visit_lifetime_def(&mut self, lifetime: &LifetimeDef) {
         self.count += 1;
         walk_lifetime_def(self, lifetime)
     }
-    fn visit_mac(&mut self, _mac: &'v Mac) {
+    fn visit_mac(&mut self, _mac: &Mac) {
         self.count += 1;
         walk_mac(self, _mac)
     }
-    fn visit_path(&mut self, path: &'v Path, _id: NodeId) {
+    fn visit_path(&mut self, path: &Path, _id: NodeId) {
         self.count += 1;
         walk_path(self, path)
     }
-    fn visit_path_list_item(&mut self, prefix: &'v Path, item: &'v PathListItem) {
+    fn visit_path_list_item(&mut self, prefix: &Path, item: &PathListItem) {
         self.count += 1;
         walk_path_list_item(self, prefix, item)
     }
-    fn visit_path_parameters(&mut self, path_span: Span, path_parameters: &'v PathParameters) {
+    fn visit_path_parameters(&mut self, path_span: Span, path_parameters: &PathParameters) {
         self.count += 1;
         walk_path_parameters(self, path_span, path_parameters)
     }
-    fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding) {
+    fn visit_assoc_type_binding(&mut self, type_binding: &TypeBinding) {
         self.count += 1;
         walk_assoc_type_binding(self, type_binding)
     }
-    fn visit_attribute(&mut self, _attr: &'v Attribute) {
+    fn visit_attribute(&mut self, _attr: &Attribute) {
         self.count += 1;
     }
-    fn visit_macro_def(&mut self, macro_def: &'v MacroDef) {
+    fn visit_macro_def(&mut self, macro_def: &MacroDef) {
         self.count += 1;
         walk_macro_def(self, macro_def)
     }
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 07a6317706b..0b48c9f7032 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -49,57 +49,57 @@ pub enum FnKind<'a> {
 /// explicitly, you need to override each method.  (And you also need
 /// to monitor future changes to `Visitor` in case a new method with a
 /// new default implementation gets introduced.)
-pub trait Visitor<'v> : Sized {
+pub trait Visitor: Sized {
     fn visit_name(&mut self, _span: Span, _name: Name) {
         // Nothing to do.
     }
     fn visit_ident(&mut self, span: Span, ident: Ident) {
         walk_ident(self, span, ident);
     }
-    fn visit_mod(&mut self, m: &'v Mod, _s: Span, _n: NodeId) { walk_mod(self, m) }
-    fn visit_foreign_item(&mut self, i: &'v ForeignItem) { walk_foreign_item(self, i) }
-    fn visit_item(&mut self, i: &'v Item) { walk_item(self, i) }
-    fn visit_local(&mut self, l: &'v Local) { walk_local(self, l) }
-    fn visit_block(&mut self, b: &'v Block) { walk_block(self, b) }
-    fn visit_stmt(&mut self, s: &'v Stmt) { walk_stmt(self, s) }
-    fn visit_arm(&mut self, a: &'v Arm) { walk_arm(self, a) }
-    fn visit_pat(&mut self, p: &'v Pat) { walk_pat(self, p) }
-    fn visit_decl(&mut self, d: &'v Decl) { walk_decl(self, d) }
-    fn visit_expr(&mut self, ex: &'v Expr) { walk_expr(self, ex) }
-    fn visit_expr_post(&mut self, _ex: &'v Expr) { }
-    fn visit_ty(&mut self, t: &'v Ty) { walk_ty(self, t) }
-    fn visit_generics(&mut self, g: &'v Generics) { walk_generics(self, g) }
-    fn visit_fn(&mut self, fk: FnKind<'v>, fd: &'v FnDecl, b: &'v Block, s: Span, _: NodeId) {
+    fn visit_mod(&mut self, m: &Mod, _s: Span, _n: NodeId) { walk_mod(self, m) }
+    fn visit_foreign_item(&mut self, i: &ForeignItem) { walk_foreign_item(self, i) }
+    fn visit_item(&mut self, i: &Item) { walk_item(self, i) }
+    fn visit_local(&mut self, l: &Local) { walk_local(self, l) }
+    fn visit_block(&mut self, b: &Block) { walk_block(self, b) }
+    fn visit_stmt(&mut self, s: &Stmt) { walk_stmt(self, s) }
+    fn visit_arm(&mut self, a: &Arm) { walk_arm(self, a) }
+    fn visit_pat(&mut self, p: &Pat) { walk_pat(self, p) }
+    fn visit_decl(&mut self, d: &Decl) { walk_decl(self, d) }
+    fn visit_expr(&mut self, ex: &Expr) { walk_expr(self, ex) }
+    fn visit_expr_post(&mut self, _ex: &Expr) { }
+    fn visit_ty(&mut self, t: &Ty) { walk_ty(self, t) }
+    fn visit_generics(&mut self, g: &Generics) { walk_generics(self, g) }
+    fn visit_fn(&mut self, fk: FnKind, fd: &FnDecl, b: &Block, s: Span, _: NodeId) {
         walk_fn(self, fk, fd, b, s)
     }
-    fn visit_trait_item(&mut self, ti: &'v TraitItem) { walk_trait_item(self, ti) }
-    fn visit_impl_item(&mut self, ii: &'v ImplItem) { walk_impl_item(self, ii) }
-    fn visit_trait_ref(&mut self, t: &'v TraitRef) { walk_trait_ref(self, t) }
-    fn visit_ty_param_bound(&mut self, bounds: &'v TyParamBound) {
+    fn visit_trait_item(&mut self, ti: &TraitItem) { walk_trait_item(self, ti) }
+    fn visit_impl_item(&mut self, ii: &ImplItem) { walk_impl_item(self, ii) }
+    fn visit_trait_ref(&mut self, t: &TraitRef) { walk_trait_ref(self, t) }
+    fn visit_ty_param_bound(&mut self, bounds: &TyParamBound) {
         walk_ty_param_bound(self, bounds)
     }
-    fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef, m: &'v TraitBoundModifier) {
+    fn visit_poly_trait_ref(&mut self, t: &PolyTraitRef, m: &TraitBoundModifier) {
         walk_poly_trait_ref(self, t, m)
     }
-    fn visit_variant_data(&mut self, s: &'v VariantData, _: Ident,
-                        _: &'v Generics, _: NodeId, _: Span) {
+    fn visit_variant_data(&mut self, s: &VariantData, _: Ident,
+                          _: &Generics, _: NodeId, _: Span) {
         walk_struct_def(self, s)
     }
-    fn visit_struct_field(&mut self, s: &'v StructField) { walk_struct_field(self, s) }
-    fn visit_enum_def(&mut self, enum_definition: &'v EnumDef,
-                      generics: &'v Generics, item_id: NodeId, _: Span) {
+    fn visit_struct_field(&mut self, s: &StructField) { walk_struct_field(self, s) }
+    fn visit_enum_def(&mut self, enum_definition: &EnumDef,
+                      generics: &Generics, item_id: NodeId, _: Span) {
         walk_enum_def(self, enum_definition, generics, item_id)
     }
-    fn visit_variant(&mut self, v: &'v Variant, g: &'v Generics, item_id: NodeId) {
+    fn visit_variant(&mut self, v: &Variant, g: &Generics, item_id: NodeId) {
         walk_variant(self, v, g, item_id)
     }
-    fn visit_lifetime(&mut self, lifetime: &'v Lifetime) {
+    fn visit_lifetime(&mut self, lifetime: &Lifetime) {
         walk_lifetime(self, lifetime)
     }
-    fn visit_lifetime_def(&mut self, lifetime: &'v LifetimeDef) {
+    fn visit_lifetime_def(&mut self, lifetime: &LifetimeDef) {
         walk_lifetime_def(self, lifetime)
     }
-    fn visit_mac(&mut self, _mac: &'v Mac) {
+    fn visit_mac(&mut self, _mac: &Mac) {
         panic!("visit_mac disabled by default");
         // NB: see note about macros above.
         // if you really want a visitor that
@@ -107,26 +107,26 @@ pub trait Visitor<'v> : Sized {
         // definition in your trait impl:
         // visit::walk_mac(self, _mac)
     }
-    fn visit_path(&mut self, path: &'v Path, _id: NodeId) {
+    fn visit_path(&mut self, path: &Path, _id: NodeId) {
         walk_path(self, path)
     }
-    fn visit_path_list_item(&mut self, prefix: &'v Path, item: &'v PathListItem) {
+    fn visit_path_list_item(&mut self, prefix: &Path, item: &PathListItem) {
         walk_path_list_item(self, prefix, item)
     }
-    fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v PathSegment) {
+    fn visit_path_segment(&mut self, path_span: Span, path_segment: &PathSegment) {
         walk_path_segment(self, path_span, path_segment)
     }
-    fn visit_path_parameters(&mut self, path_span: Span, path_parameters: &'v PathParameters) {
+    fn visit_path_parameters(&mut self, path_span: Span, path_parameters: &PathParameters) {
         walk_path_parameters(self, path_span, path_parameters)
     }
-    fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding) {
+    fn visit_assoc_type_binding(&mut self, type_binding: &TypeBinding) {
         walk_assoc_type_binding(self, type_binding)
     }
-    fn visit_attribute(&mut self, _attr: &'v Attribute) {}
-    fn visit_macro_def(&mut self, macro_def: &'v MacroDef) {
+    fn visit_attribute(&mut self, _attr: &Attribute) {}
+    fn visit_macro_def(&mut self, macro_def: &MacroDef) {
         walk_macro_def(self, macro_def)
     }
-    fn visit_vis(&mut self, vis: &'v Visibility) {
+    fn visit_vis(&mut self, vis: &Visibility) {
         walk_vis(self, vis)
     }
 }
@@ -145,46 +145,45 @@ macro_rules! walk_list {
     }
 }
 
-pub fn walk_opt_name<'v, V: Visitor<'v>>(visitor: &mut V, span: Span, opt_name: Option<Name>) {
+pub fn walk_opt_name<V: Visitor>(visitor: &mut V, span: Span, opt_name: Option<Name>) {
     if let Some(name) = opt_name {
         visitor.visit_name(span, name);
     }
 }
 
-pub fn walk_opt_ident<'v, V: Visitor<'v>>(visitor: &mut V, span: Span, opt_ident: Option<Ident>) {
+pub fn walk_opt_ident<V: Visitor>(visitor: &mut V, span: Span, opt_ident: Option<Ident>) {
     if let Some(ident) = opt_ident {
         visitor.visit_ident(span, ident);
     }
 }
 
-pub fn walk_opt_sp_ident<'v, V: Visitor<'v>>(visitor: &mut V,
-                                             opt_sp_ident: &Option<Spanned<Ident>>) {
+pub fn walk_opt_sp_ident<V: Visitor>(visitor: &mut V, opt_sp_ident: &Option<Spanned<Ident>>) {
     if let Some(ref sp_ident) = *opt_sp_ident {
         visitor.visit_ident(sp_ident.span, sp_ident.node);
     }
 }
 
-pub fn walk_ident<'v, V: Visitor<'v>>(visitor: &mut V, span: Span, ident: Ident) {
+pub fn walk_ident<V: Visitor>(visitor: &mut V, span: Span, ident: Ident) {
     visitor.visit_name(span, ident.name);
 }
 
-pub fn walk_crate<'v, V: Visitor<'v>>(visitor: &mut V, krate: &'v Crate) {
+pub fn walk_crate<V: Visitor>(visitor: &mut V, krate: &Crate) {
     visitor.visit_mod(&krate.module, krate.span, CRATE_NODE_ID);
     walk_list!(visitor, visit_attribute, &krate.attrs);
     walk_list!(visitor, visit_macro_def, &krate.exported_macros);
 }
 
-pub fn walk_macro_def<'v, V: Visitor<'v>>(visitor: &mut V, macro_def: &'v MacroDef) {
+pub fn walk_macro_def<V: Visitor>(visitor: &mut V, macro_def: &MacroDef) {
     visitor.visit_ident(macro_def.span, macro_def.ident);
     walk_opt_ident(visitor, macro_def.span, macro_def.imported_from);
     walk_list!(visitor, visit_attribute, &macro_def.attrs);
 }
 
-pub fn walk_mod<'v, V: Visitor<'v>>(visitor: &mut V, module: &'v Mod) {
+pub fn walk_mod<V: Visitor>(visitor: &mut V, module: &Mod) {
     walk_list!(visitor, visit_item, &module.items);
 }
 
-pub fn walk_local<'v, V: Visitor<'v>>(visitor: &mut V, local: &'v Local) {
+pub fn walk_local<V: Visitor>(visitor: &mut V, local: &Local) {
     for attr in local.attrs.as_attr_slice() {
         visitor.visit_attribute(attr);
     }
@@ -193,33 +192,27 @@ pub fn walk_local<'v, V: Visitor<'v>>(visitor: &mut V, local: &'v Local) {
     walk_list!(visitor, visit_expr, &local.init);
 }
 
-pub fn walk_lifetime<'v, V: Visitor<'v>>(visitor: &mut V, lifetime: &'v Lifetime) {
+pub fn walk_lifetime<V: Visitor>(visitor: &mut V, lifetime: &Lifetime) {
     visitor.visit_name(lifetime.span, lifetime.name);
 }
 
-pub fn walk_lifetime_def<'v, V: Visitor<'v>>(visitor: &mut V,
-                                              lifetime_def: &'v LifetimeDef) {
+pub fn walk_lifetime_def<V: Visitor>(visitor: &mut V, lifetime_def: &LifetimeDef) {
     visitor.visit_lifetime(&lifetime_def.lifetime);
     walk_list!(visitor, visit_lifetime, &lifetime_def.bounds);
 }
 
-pub fn walk_poly_trait_ref<'v, V>(visitor: &mut V,
-                                  trait_ref: &'v PolyTraitRef,
-                                  _modifier: &'v TraitBoundModifier)
-    where V: Visitor<'v>
+pub fn walk_poly_trait_ref<V>(visitor: &mut V, trait_ref: &PolyTraitRef, _: &TraitBoundModifier)
+    where V: Visitor,
 {
     walk_list!(visitor, visit_lifetime_def, &trait_ref.bound_lifetimes);
     visitor.visit_trait_ref(&trait_ref.trait_ref);
 }
 
-pub fn walk_trait_ref<'v,V>(visitor: &mut V,
-                                   trait_ref: &'v TraitRef)
-    where V: Visitor<'v>
-{
+pub fn walk_trait_ref<V: Visitor>(visitor: &mut V, trait_ref: &TraitRef) {
     visitor.visit_path(&trait_ref.path, trait_ref.ref_id)
 }
 
-pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item) {
+pub fn walk_item<V: Visitor>(visitor: &mut V, item: &Item) {
     visitor.visit_vis(&item.vis);
     visitor.visit_ident(item.span, item.ident);
     match item.node {
@@ -298,17 +291,16 @@ pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item) {
     walk_list!(visitor, visit_attribute, &item.attrs);
 }
 
-pub fn walk_enum_def<'v, V: Visitor<'v>>(visitor: &mut V,
-                                         enum_definition: &'v EnumDef,
-                                         generics: &'v Generics,
-                                         item_id: NodeId) {
+pub fn walk_enum_def<V: Visitor>(visitor: &mut V,
+                                 enum_definition: &EnumDef,
+                                 generics: &Generics,
+                                 item_id: NodeId) {
     walk_list!(visitor, visit_variant, &enum_definition.variants, generics, item_id);
 }
 
-pub fn walk_variant<'v, V: Visitor<'v>>(visitor: &mut V,
-                                        variant: &'v Variant,
-                                        generics: &'v Generics,
-                                        item_id: NodeId) {
+pub fn walk_variant<V>(visitor: &mut V, variant: &Variant, generics: &Generics, item_id: NodeId)
+    where V: Visitor,
+{
     visitor.visit_ident(variant.span, variant.node.name);
     visitor.visit_variant_data(&variant.node.data, variant.node.name,
                              generics, item_id, variant.span);
@@ -316,7 +308,7 @@ pub fn walk_variant<'v, V: Visitor<'v>>(visitor: &mut V,
     walk_list!(visitor, visit_attribute, &variant.node.attrs);
 }
 
-pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
+pub fn walk_ty<V: Visitor>(visitor: &mut V, typ: &Ty) {
     match typ.node {
         TyKind::Vec(ref ty) | TyKind::Paren(ref ty) => {
             visitor.visit_ty(ty)
@@ -362,28 +354,25 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
     }
 }
 
-pub fn walk_path<'v, V: Visitor<'v>>(visitor: &mut V, path: &'v Path) {
+pub fn walk_path<V: Visitor>(visitor: &mut V, path: &Path) {
     for segment in &path.segments {
         visitor.visit_path_segment(path.span, segment);
     }
 }
 
-pub fn walk_path_list_item<'v, V: Visitor<'v>>(visitor: &mut V, _prefix: &'v Path,
-                                               item: &'v PathListItem) {
+pub fn walk_path_list_item<V: Visitor>(visitor: &mut V, _prefix: &Path, item: &PathListItem) {
     walk_opt_ident(visitor, item.span, item.node.name());
     walk_opt_ident(visitor, item.span, item.node.rename());
 }
 
-pub fn walk_path_segment<'v, V: Visitor<'v>>(visitor: &mut V,
-                                             path_span: Span,
-                                             segment: &'v PathSegment) {
+pub fn walk_path_segment<V: Visitor>(visitor: &mut V, path_span: Span, segment: &PathSegment) {
     visitor.visit_ident(path_span, segment.identifier);
     visitor.visit_path_parameters(path_span, &segment.parameters);
 }
 
-pub fn walk_path_parameters<'v, V: Visitor<'v>>(visitor: &mut V,
-                                                _path_span: Span,
-                                                path_parameters: &'v PathParameters) {
+pub fn walk_path_parameters<V>(visitor: &mut V, _path_span: Span, path_parameters: &PathParameters)
+    where V: Visitor,
+{
     match *path_parameters {
         PathParameters::AngleBracketed(ref data) => {
             walk_list!(visitor, visit_ty, &data.types);
@@ -397,13 +386,12 @@ pub fn walk_path_parameters<'v, V: Visitor<'v>>(visitor: &mut V,
     }
 }
 
-pub fn walk_assoc_type_binding<'v, V: Visitor<'v>>(visitor: &mut V,
-                                                   type_binding: &'v TypeBinding) {
+pub fn walk_assoc_type_binding<V: Visitor>(visitor: &mut V, type_binding: &TypeBinding) {
     visitor.visit_ident(type_binding.span, type_binding.ident);
     visitor.visit_ty(&type_binding.ty);
 }
 
-pub fn walk_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v Pat) {
+pub fn walk_pat<V: Visitor>(visitor: &mut V, pattern: &Pat) {
     match pattern.node {
         PatKind::TupleStruct(ref path, ref children, _) => {
             visitor.visit_path(path, pattern.id);
@@ -449,8 +437,7 @@ pub fn walk_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v Pat) {
     }
 }
 
-pub fn walk_foreign_item<'v, V: Visitor<'v>>(visitor: &mut V,
-                                             foreign_item: &'v ForeignItem) {
+pub fn walk_foreign_item<V: Visitor>(visitor: &mut V, foreign_item: &ForeignItem) {
     visitor.visit_vis(&foreign_item.vis);
     visitor.visit_ident(foreign_item.span, foreign_item.ident);
 
@@ -465,8 +452,7 @@ pub fn walk_foreign_item<'v, V: Visitor<'v>>(visitor: &mut V,
     walk_list!(visitor, visit_attribute, &foreign_item.attrs);
 }
 
-pub fn walk_ty_param_bound<'v, V: Visitor<'v>>(visitor: &mut V,
-                                               bound: &'v TyParamBound) {
+pub fn walk_ty_param_bound<V: Visitor>(visitor: &mut V, bound: &TyParamBound) {
     match *bound {
         TraitTyParamBound(ref typ, ref modifier) => {
             visitor.visit_poly_trait_ref(typ, modifier);
@@ -477,7 +463,7 @@ pub fn walk_ty_param_bound<'v, V: Visitor<'v>>(visitor: &mut V,
     }
 }
 
-pub fn walk_generics<'v, V: Visitor<'v>>(visitor: &mut V, generics: &'v Generics) {
+pub fn walk_generics<V: Visitor>(visitor: &mut V, generics: &Generics) {
     for param in &generics.ty_params {
         visitor.visit_ident(param.span, param.ident);
         walk_list!(visitor, visit_ty_param_bound, &param.bounds);
@@ -511,13 +497,13 @@ pub fn walk_generics<'v, V: Visitor<'v>>(visitor: &mut V, generics: &'v Generics
     }
 }
 
-pub fn walk_fn_ret_ty<'v, V: Visitor<'v>>(visitor: &mut V, ret_ty: &'v FunctionRetTy) {
+pub fn walk_fn_ret_ty<V: Visitor>(visitor: &mut V, ret_ty: &FunctionRetTy) {
     if let FunctionRetTy::Ty(ref output_ty) = *ret_ty {
         visitor.visit_ty(output_ty)
     }
 }
 
-pub fn walk_fn_decl<'v, V: Visitor<'v>>(visitor: &mut V, function_declaration: &'v FnDecl) {
+pub fn walk_fn_decl<V: Visitor>(visitor: &mut V, function_declaration: &FnDecl) {
     for argument in &function_declaration.inputs {
         visitor.visit_pat(&argument.pat);
         visitor.visit_ty(&argument.ty)
@@ -525,8 +511,7 @@ pub fn walk_fn_decl<'v, V: Visitor<'v>>(visitor: &mut V, function_declaration: &
     walk_fn_ret_ty(visitor, &function_declaration.output)
 }
 
-pub fn walk_fn_kind<'v, V: Visitor<'v>>(visitor: &mut V,
-                                        function_kind: FnKind<'v>) {
+pub fn walk_fn_kind<V: Visitor>(visitor: &mut V, function_kind: FnKind) {
     match function_kind {
         FnKind::ItemFn(_, generics, _, _, _, _) => {
             visitor.visit_generics(generics);
@@ -538,17 +523,15 @@ pub fn walk_fn_kind<'v, V: Visitor<'v>>(visitor: &mut V,
     }
 }
 
-pub fn walk_fn<'v, V: Visitor<'v>>(visitor: &mut V,
-                                   function_kind: FnKind<'v>,
-                                   function_declaration: &'v FnDecl,
-                                   function_body: &'v Block,
-                                   _span: Span) {
-    walk_fn_decl(visitor, function_declaration);
-    walk_fn_kind(visitor, function_kind);
-    visitor.visit_block(function_body)
+pub fn walk_fn<V>(visitor: &mut V, kind: FnKind, declaration: &FnDecl, body: &Block, _span: Span)
+    where V: Visitor,
+{
+    walk_fn_decl(visitor, declaration);
+    walk_fn_kind(visitor, kind);
+    visitor.visit_block(body)
 }
 
-pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v TraitItem) {
+pub fn walk_trait_item<V: Visitor>(visitor: &mut V, trait_item: &TraitItem) {
     visitor.visit_ident(trait_item.span, trait_item.ident);
     walk_list!(visitor, visit_attribute, &trait_item.attrs);
     match trait_item.node {
@@ -571,7 +554,7 @@ pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v Trai
     }
 }
 
-pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplItem) {
+pub fn walk_impl_item<V: Visitor>(visitor: &mut V, impl_item: &ImplItem) {
     visitor.visit_vis(&impl_item.vis);
     visitor.visit_ident(impl_item.span, impl_item.ident);
     walk_list!(visitor, visit_attribute, &impl_item.attrs);
@@ -593,25 +576,23 @@ pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplIt
     }
 }
 
-pub fn walk_struct_def<'v, V: Visitor<'v>>(visitor: &mut V,
-                                           struct_definition: &'v VariantData) {
+pub fn walk_struct_def<V: Visitor>(visitor: &mut V, struct_definition: &VariantData) {
     walk_list!(visitor, visit_struct_field, struct_definition.fields());
 }
 
-pub fn walk_struct_field<'v, V: Visitor<'v>>(visitor: &mut V,
-                                             struct_field: &'v StructField) {
+pub fn walk_struct_field<V: Visitor>(visitor: &mut V, struct_field: &StructField) {
     visitor.visit_vis(&struct_field.vis);
     walk_opt_ident(visitor, struct_field.span, struct_field.ident);
     visitor.visit_ty(&struct_field.ty);
     walk_list!(visitor, visit_attribute, &struct_field.attrs);
 }
 
-pub fn walk_block<'v, V: Visitor<'v>>(visitor: &mut V, block: &'v Block) {
+pub fn walk_block<V: Visitor>(visitor: &mut V, block: &Block) {
     walk_list!(visitor, visit_stmt, &block.stmts);
     walk_list!(visitor, visit_expr, &block.expr);
 }
 
-pub fn walk_stmt<'v, V: Visitor<'v>>(visitor: &mut V, statement: &'v Stmt) {
+pub fn walk_stmt<V: Visitor>(visitor: &mut V, statement: &Stmt) {
     match statement.node {
         StmtKind::Decl(ref declaration, _) => visitor.visit_decl(declaration),
         StmtKind::Expr(ref expression, _) | StmtKind::Semi(ref expression, _) => {
@@ -626,18 +607,18 @@ pub fn walk_stmt<'v, V: Visitor<'v>>(visitor: &mut V, statement: &'v Stmt) {
     }
 }
 
-pub fn walk_decl<'v, V: Visitor<'v>>(visitor: &mut V, declaration: &'v Decl) {
+pub fn walk_decl<V: Visitor>(visitor: &mut V, declaration: &Decl) {
     match declaration.node {
         DeclKind::Local(ref local) => visitor.visit_local(local),
         DeclKind::Item(ref item) => visitor.visit_item(item),
     }
 }
 
-pub fn walk_mac<'v, V: Visitor<'v>>(_: &mut V, _: &'v Mac) {
+pub fn walk_mac<V: Visitor>(_: &mut V, _: &Mac) {
     // Empty!
 }
 
-pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr) {
+pub fn walk_expr<V: Visitor>(visitor: &mut V, expression: &Expr) {
     for attr in expression.attrs.as_attr_slice() {
         visitor.visit_attribute(attr);
     }
@@ -787,14 +768,14 @@ pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr) {
     visitor.visit_expr_post(expression)
 }
 
-pub fn walk_arm<'v, V: Visitor<'v>>(visitor: &mut V, arm: &'v Arm) {
+pub fn walk_arm<V: Visitor>(visitor: &mut V, arm: &Arm) {
     walk_list!(visitor, visit_pat, &arm.pats);
     walk_list!(visitor, visit_expr, &arm.guard);
     visitor.visit_expr(&arm.body);
     walk_list!(visitor, visit_attribute, &arm.attrs);
 }
 
-pub fn walk_vis<'v, V: Visitor<'v>>(visitor: &mut V, vis: &'v Visibility) {
+pub fn walk_vis<V: Visitor>(visitor: &mut V, vis: &Visibility) {
     if let Visibility::Restricted { ref path, id } = *vis {
         visitor.visit_path(path, id);
     }
diff --git a/src/libsyntax_ext/deriving/generic/mod.rs b/src/libsyntax_ext/deriving/generic/mod.rs
index d6adec84e84..3661454b433 100644
--- a/src/libsyntax_ext/deriving/generic/mod.rs
+++ b/src/libsyntax_ext/deriving/generic/mod.rs
@@ -353,8 +353,8 @@ fn find_type_parameters(ty: &ast::Ty, ty_param_names: &[ast::Name]) -> Vec<P<ast
         types: Vec<P<ast::Ty>>,
     }
 
-    impl<'a> visit::Visitor<'a> for Visitor<'a> {
-        fn visit_ty(&mut self, ty: &'a ast::Ty) {
+    impl<'a> visit::Visitor for Visitor<'a> {
+        fn visit_ty(&mut self, ty: &ast::Ty) {
             match ty.node {
                 ast::TyKind::Path(_, ref path) if !path.global => {
                     match path.segments.first() {