auto merge of #9187 : lkuper/rust/no-simplevisitor, r=catamorphism

We don't seem to be using `SimpleVisitor` anywhere in rustc.  Is there any reason to keep it around?

r? anyone

src/libsyntax/ast_util.rs

-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -15,7 +15,7 @@
 use fold;
 use opt_vec;
 use parse::token;
-use visit::{SimpleVisitor, Visitor};
+use visit::Visitor;
 use visit;
 
 use std::hashmap::HashMap;

src/libsyntax/visit.rs

-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -668,144 +668,3 @@ pub fn walk_arm<E:Clone, V:Visitor<E>>(visitor: &mut V, arm: &Arm, env: E) {
     walk_expr_opt(visitor, arm.guard, env.clone());
     visitor.visit_block(&arm.body, env)
 }
-
-// Simpler, non-context passing interface. Always walks the whole tree, simply
-// calls the given functions on the nodes.
-
-pub trait SimpleVisitor {
-    fn visit_mod(&mut self, &_mod, Span, NodeId);
-    fn visit_view_item(&mut self, &view_item);
-    fn visit_foreign_item(&mut self, @foreign_item);
-    fn visit_item(&mut self, @item);
-    fn visit_local(&mut self, @Local);
-    fn visit_block(&mut self, &Block);
-    fn visit_stmt(&mut self, @Stmt);
-    fn visit_arm(&mut self, &Arm);
-    fn visit_pat(&mut self, @Pat);
-    fn visit_decl(&mut self, @Decl);
-    fn visit_expr(&mut self, @Expr);
-    fn visit_expr_post(&mut self, @Expr);
-    fn visit_ty(&mut self, &Ty);
-    fn visit_generics(&mut self, &Generics);
-    fn visit_fn(&mut self, &fn_kind, &fn_decl, &Block, Span, NodeId);
-    fn visit_ty_method(&mut self, &TypeMethod);
-    fn visit_trait_method(&mut self, &trait_method);
-    fn visit_struct_def(&mut self, @struct_def, Ident, &Generics, NodeId);
-    fn visit_struct_field(&mut self, @struct_field);
-    fn visit_struct_method(&mut self, @method);
-}
-
-pub struct SimpleVisitorVisitor {
-    simple_visitor: @mut SimpleVisitor,
-}
-
-impl Visitor<()> for SimpleVisitorVisitor {
-    fn visit_mod(&mut self,
-                 module: &_mod,
-                 span: Span,
-                 node_id: NodeId,
-                 env: ()) {
-        self.simple_visitor.visit_mod(module, span, node_id);
-        walk_mod(self, module, env)
-    }
-    fn visit_view_item(&mut self, view_item: &view_item, env: ()) {
-        self.simple_visitor.visit_view_item(view_item);
-        walk_view_item(self, view_item, env)
-    }
-    fn visit_foreign_item(&mut self, foreign_item: @foreign_item, env: ()) {
-        self.simple_visitor.visit_foreign_item(foreign_item);
-        walk_foreign_item(self, foreign_item, env)
-    }
-    fn visit_item(&mut self, item: @item, env: ()) {
-        self.simple_visitor.visit_item(item);
-        walk_item(self, item, env)
-    }
-    fn visit_local(&mut self, local: @Local, env: ()) {
-        self.simple_visitor.visit_local(local);
-        walk_local(self, local, env)
-    }
-    fn visit_block(&mut self, block: &Block, env: ()) {
-        self.simple_visitor.visit_block(block);
-        walk_block(self, block, env)
-    }
-    fn visit_stmt(&mut self, statement: @Stmt, env: ()) {
-        self.simple_visitor.visit_stmt(statement);
-        walk_stmt(self, statement, env)
-    }
-    fn visit_arm(&mut self, arm: &Arm, env: ()) {
-        self.simple_visitor.visit_arm(arm);
-        walk_arm(self, arm, env)
-    }
-    fn visit_pat(&mut self, pattern: @Pat, env: ()) {
-        self.simple_visitor.visit_pat(pattern);
-        walk_pat(self, pattern, env)
-    }
-    fn visit_decl(&mut self, declaration: @Decl, env: ()) {
-        self.simple_visitor.visit_decl(declaration);
-        walk_decl(self, declaration, env)
-    }
-    fn visit_expr(&mut self, expression: @Expr, env: ()) {
-        self.simple_visitor.visit_expr(expression);
-        walk_expr(self, expression, env)
-    }
-    fn visit_expr_post(&mut self, expression: @Expr, _: ()) {
-        self.simple_visitor.visit_expr_post(expression)
-    }
-    fn visit_ty(&mut self, typ: &Ty, env: ()) {
-        self.simple_visitor.visit_ty(typ);
-        walk_ty(self, typ, env)
-    }
-    fn visit_generics(&mut self, generics: &Generics, env: ()) {
-        self.simple_visitor.visit_generics(generics);
-        walk_generics(self, generics, env)
-    }
-    fn visit_fn(&mut self,
-                function_kind: &fn_kind,
-                function_declaration: &fn_decl,
-                block: &Block,
-                span: Span,
-                node_id: NodeId,
-                env: ()) {
-        self.simple_visitor.visit_fn(function_kind,
-                                     function_declaration,
-                                     block,
-                                     span,
-                                     node_id);
-        walk_fn(self,
-                 function_kind,
-                 function_declaration,
-                 block,
-                 span,
-                 node_id,
-                 env)
-    }
-    fn visit_ty_method(&mut self, method_type: &TypeMethod, env: ()) {
-        self.simple_visitor.visit_ty_method(method_type);
-        walk_ty_method(self, method_type, env)
-    }
-    fn visit_trait_method(&mut self, trait_method: &trait_method, env: ()) {
-        self.simple_visitor.visit_trait_method(trait_method);
-        walk_trait_method(self, trait_method, env)
-    }
-    fn visit_struct_def(&mut self,
-                        struct_definition: @struct_def,
-                        identifier: Ident,
-                        generics: &Generics,
-                        node_id: NodeId,
-                        env: ()) {
-        self.simple_visitor.visit_struct_def(struct_definition,
-                                             identifier,
-                                             generics,
-                                             node_id);
-        walk_struct_def(self,
-                         struct_definition,
-                         identifier,
-                         generics,
-                         node_id,
-                         env)
-    }
-    fn visit_struct_field(&mut self, struct_field: @struct_field, env: ()) {
-        self.simple_visitor.visit_struct_field(struct_field);
-        walk_struct_field(self, struct_field, env)
-    }
-}