src/libsyntax/ext/build.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use abi;
  12 use ast::{Ident, Generics, Expr};
  13 use ast;
  14 use ast_util;
  15 use attr;
  16 use codemap::{Span, respan, Spanned, DUMMY_SP, Pos};
  17 use ext::base::ExtCtxt;
  18 use owned_slice::OwnedSlice;
  19 use parse::token::special_idents;
  20 use parse::token::InternedString;
  21 use parse::token;
  22 use ptr::P;
  23
  24 // Transitional reexports so qquote can find the paths it is looking for
  25 mod syntax {
  26     pub use ext;
  27     pub use parse;
  28 }
  29
  30 pub trait AstBuilder {
  31     // paths
  32     fn path(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path;
  33     fn path_ident(&self, span: Span, id: ast::Ident) -> ast::Path;
  34     fn path_global(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path;
  35     fn path_all(&self, sp: Span,
  36                 global: bool,
  37                 idents: Vec<ast::Ident> ,
  38                 lifetimes: Vec<ast::Lifetime>,
  39                 types: Vec<P<ast::Ty>>,
  40                 bindings: Vec<P<ast::TypeBinding>> )
  41         -> ast::Path;
  42
  43     fn qpath(&self, self_type: P<ast::Ty>,
  44              trait_path: ast::Path,
  45              ident: ast::Ident)
  46              -> (ast::QSelf, ast::Path);
  47     fn qpath_all(&self, self_type: P<ast::Ty>,
  48                 trait_path: ast::Path,
  49                 ident: ast::Ident,
  50                 lifetimes: Vec<ast::Lifetime>,
  51                 types: Vec<P<ast::Ty>>,
  52                 bindings: Vec<P<ast::TypeBinding>>)
  53                 -> (ast::QSelf, ast::Path);
  54
  55     // types
  56     fn ty_mt(&self, ty: P<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy;
  57
  58     fn ty(&self, span: Span, ty: ast::Ty_) -> P<ast::Ty>;
  59     fn ty_path(&self, ast::Path) -> P<ast::Ty>;
  60     fn ty_sum(&self, ast::Path, OwnedSlice<ast::TyParamBound>) -> P<ast::Ty>;
  61     fn ty_ident(&self, span: Span, idents: ast::Ident) -> P<ast::Ty>;
  62
  63     fn ty_rptr(&self, span: Span,
  64                ty: P<ast::Ty>,
  65                lifetime: Option<ast::Lifetime>,
  66                mutbl: ast::Mutability) -> P<ast::Ty>;
  67     fn ty_ptr(&self, span: Span,
  68               ty: P<ast::Ty>,
  69               mutbl: ast::Mutability) -> P<ast::Ty>;
  70
  71     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty>;
  72     fn ty_infer(&self, sp: Span) -> P<ast::Ty>;
  73
  74     fn ty_vars(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> ;
  75     fn ty_vars_global(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> ;
  76     fn ty_field_imm(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::TypeField;
  77
  78     fn typaram(&self,
  79                span: Span,
  80                id: ast::Ident,
  81                bounds: OwnedSlice<ast::TyParamBound>,
  82                default: Option<P<ast::Ty>>) -> ast::TyParam;
  83
  84     fn trait_ref(&self, path: ast::Path) -> ast::TraitRef;
  85     fn poly_trait_ref(&self, span: Span, path: ast::Path) -> ast::PolyTraitRef;
  86     fn typarambound(&self, path: ast::Path) -> ast::TyParamBound;
  87     fn lifetime(&self, span: Span, ident: ast::Name) -> ast::Lifetime;
  88     fn lifetime_def(&self,
  89                     span: Span,
  90                     name: ast::Name,
  91                     bounds: Vec<ast::Lifetime>)
  92                     -> ast::LifetimeDef;
  93
  94     // statements
  95     fn stmt_expr(&self, expr: P<ast::Expr>) -> P<ast::Stmt>;
  96     fn stmt_let(&self, sp: Span, mutbl: bool, ident: ast::Ident, ex: P<ast::Expr>) -> P<ast::Stmt>;
  97     fn stmt_let_typed(&self,
  98                       sp: Span,
  99                       mutbl: bool,
 100                       ident: ast::Ident,
 101                       typ: P<ast::Ty>,
 102                       ex: P<ast::Expr>)
 103                       -> P<ast::Stmt>;
 104     fn stmt_item(&self, sp: Span, item: P<ast::Item>) -> P<ast::Stmt>;
 105
 106     // blocks
 107     fn block(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 108              expr: Option<P<ast::Expr>>) -> P<ast::Block>;
 109     fn block_expr(&self, expr: P<ast::Expr>) -> P<ast::Block>;
 110     fn block_all(&self, span: Span,
 111                  stmts: Vec<P<ast::Stmt>>,
 112                  expr: Option<P<ast::Expr>>) -> P<ast::Block>;
 113
 114     // expressions
 115     fn expr(&self, span: Span, node: ast::Expr_) -> P<ast::Expr>;
 116     fn expr_path(&self, path: ast::Path) -> P<ast::Expr>;
 117     fn expr_qpath(&self, span: Span, qself: ast::QSelf, path: ast::Path) -> P<ast::Expr>;
 118     fn expr_ident(&self, span: Span, id: ast::Ident) -> P<ast::Expr>;
 119
 120     fn expr_self(&self, span: Span) -> P<ast::Expr>;
 121     fn expr_binary(&self, sp: Span, op: ast::BinOp_,
 122                    lhs: P<ast::Expr>, rhs: P<ast::Expr>) -> P<ast::Expr>;
 123     fn expr_deref(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr>;
 124     fn expr_unary(&self, sp: Span, op: ast::UnOp, e: P<ast::Expr>) -> P<ast::Expr>;
 125
 126     fn expr_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr>;
 127     fn expr_mut_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr>;
 128     fn expr_field_access(&self, span: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr>;
 129     fn expr_tup_field_access(&self, sp: Span, expr: P<ast::Expr>,
 130                              idx: usize) -> P<ast::Expr>;
 131     fn expr_call(&self, span: Span, expr: P<ast::Expr>, args: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 132     fn expr_call_ident(&self, span: Span, id: ast::Ident, args: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 133     fn expr_call_global(&self, sp: Span, fn_path: Vec<ast::Ident>,
 134                         args: Vec<P<ast::Expr>> ) -> P<ast::Expr>;
 135     fn expr_method_call(&self, span: Span,
 136                         expr: P<ast::Expr>, ident: ast::Ident,
 137                         args: Vec<P<ast::Expr>> ) -> P<ast::Expr>;
 138     fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr>;
 139     fn expr_cast(&self, sp: Span, expr: P<ast::Expr>, ty: P<ast::Ty>) -> P<ast::Expr>;
 140
 141     fn field_imm(&self, span: Span, name: Ident, e: P<ast::Expr>) -> ast::Field;
 142     fn expr_struct(&self, span: Span, path: ast::Path, fields: Vec<ast::Field>) -> P<ast::Expr>;
 143     fn expr_struct_ident(&self, span: Span, id: ast::Ident,
 144                          fields: Vec<ast::Field>) -> P<ast::Expr>;
 145
 146     fn expr_lit(&self, sp: Span, lit: ast::Lit_) -> P<ast::Expr>;
 147
 148     fn expr_usize(&self, span: Span, i: usize) -> P<ast::Expr>;
 149     fn expr_isize(&self, sp: Span, i: isize) -> P<ast::Expr>;
 150     fn expr_u8(&self, sp: Span, u: u8) -> P<ast::Expr>;
 151     fn expr_u32(&self, sp: Span, u: u32) -> P<ast::Expr>;
 152     fn expr_bool(&self, sp: Span, value: bool) -> P<ast::Expr>;
 153
 154     fn expr_vec(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 155     fn expr_vec_ng(&self, sp: Span) -> P<ast::Expr>;
 156     fn expr_vec_slice(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 157     fn expr_str(&self, sp: Span, s: InternedString) -> P<ast::Expr>;
 158
 159     fn expr_some(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 160     fn expr_none(&self, sp: Span) -> P<ast::Expr>;
 161
 162     fn expr_break(&self, sp: Span) -> P<ast::Expr>;
 163
 164     fn expr_tuple(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 165
 166     fn expr_fail(&self, span: Span, msg: InternedString) -> P<ast::Expr>;
 167     fn expr_unreachable(&self, span: Span) -> P<ast::Expr>;
 168
 169     fn expr_ok(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 170     fn expr_err(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 171     fn expr_try(&self, span: Span, head: P<ast::Expr>) -> P<ast::Expr>;
 172
 173     fn pat(&self, span: Span, pat: ast::Pat_) -> P<ast::Pat>;
 174     fn pat_wild(&self, span: Span) -> P<ast::Pat>;
 175     fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat>;
 176     fn pat_ident(&self, span: Span, ident: ast::Ident) -> P<ast::Pat>;
 177
 178     fn pat_ident_binding_mode(&self,
 179                               span: Span,
 180                               ident: ast::Ident,
 181                               bm: ast::BindingMode) -> P<ast::Pat>;
 182     fn pat_enum(&self, span: Span, path: ast::Path, subpats: Vec<P<ast::Pat>> ) -> P<ast::Pat>;
 183     fn pat_struct(&self, span: Span,
 184                   path: ast::Path, field_pats: Vec<Spanned<ast::FieldPat>> ) -> P<ast::Pat>;
 185     fn pat_tuple(&self, span: Span, pats: Vec<P<ast::Pat>>) -> P<ast::Pat>;
 186
 187     fn pat_some(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat>;
 188     fn pat_none(&self, span: Span) -> P<ast::Pat>;
 189
 190     fn pat_ok(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat>;
 191     fn pat_err(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat>;
 192
 193     fn arm(&self, span: Span, pats: Vec<P<ast::Pat>>, expr: P<ast::Expr>) -> ast::Arm;
 194     fn arm_unreachable(&self, span: Span) -> ast::Arm;
 195
 196     fn expr_match(&self, span: Span, arg: P<ast::Expr>, arms: Vec<ast::Arm> ) -> P<ast::Expr>;
 197     fn expr_if(&self, span: Span,
 198                cond: P<ast::Expr>, then: P<ast::Expr>, els: Option<P<ast::Expr>>) -> P<ast::Expr>;
 199     fn expr_loop(&self, span: Span, block: P<ast::Block>) -> P<ast::Expr>;
 200
 201     fn lambda_fn_decl(&self, span: Span,
 202                       fn_decl: P<ast::FnDecl>, blk: P<ast::Block>) -> P<ast::Expr>;
 203
 204     fn lambda(&self, span: Span, ids: Vec<ast::Ident> , blk: P<ast::Block>) -> P<ast::Expr>;
 205     fn lambda0(&self, span: Span, blk: P<ast::Block>) -> P<ast::Expr>;
 206     fn lambda1(&self, span: Span, blk: P<ast::Block>, ident: ast::Ident) -> P<ast::Expr>;
 207
 208     fn lambda_expr(&self, span: Span, ids: Vec<ast::Ident> , blk: P<ast::Expr>) -> P<ast::Expr>;
 209     fn lambda_expr_0(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 210     fn lambda_expr_1(&self, span: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr>;
 211
 212     fn lambda_stmts(&self, span: Span, ids: Vec<ast::Ident>,
 213                     blk: Vec<P<ast::Stmt>>) -> P<ast::Expr>;
 214     fn lambda_stmts_0(&self, span: Span, stmts: Vec<P<ast::Stmt>>) -> P<ast::Expr>;
 215     fn lambda_stmts_1(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 216                       ident: ast::Ident) -> P<ast::Expr>;
 217
 218     // items
 219     fn item(&self, span: Span,
 220             name: Ident, attrs: Vec<ast::Attribute> , node: ast::Item_) -> P<ast::Item>;
 221
 222     fn arg(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::Arg;
 223     // FIXME unused self
 224     fn fn_decl(&self, inputs: Vec<ast::Arg> , output: P<ast::Ty>) -> P<ast::FnDecl>;
 225
 226     fn item_fn_poly(&self,
 227                     span: Span,
 228                     name: Ident,
 229                     inputs: Vec<ast::Arg> ,
 230                     output: P<ast::Ty>,
 231                     generics: Generics,
 232                     body: P<ast::Block>) -> P<ast::Item>;
 233     fn item_fn(&self,
 234                span: Span,
 235                name: Ident,
 236                inputs: Vec<ast::Arg> ,
 237                output: P<ast::Ty>,
 238                body: P<ast::Block>) -> P<ast::Item>;
 239
 240     fn variant(&self, span: Span, name: Ident, tys: Vec<P<ast::Ty>> ) -> ast::Variant;
 241     fn item_enum_poly(&self,
 242                       span: Span,
 243                       name: Ident,
 244                       enum_definition: ast::EnumDef,
 245                       generics: Generics) -> P<ast::Item>;
 246     fn item_enum(&self, span: Span, name: Ident, enum_def: ast::EnumDef) -> P<ast::Item>;
 247
 248     fn item_struct_poly(&self,
 249                         span: Span,
 250                         name: Ident,
 251                         struct_def: ast::StructDef,
 252                         generics: Generics) -> P<ast::Item>;
 253     fn item_struct(&self, span: Span, name: Ident, struct_def: ast::StructDef) -> P<ast::Item>;
 254
 255     fn item_mod(&self, span: Span, inner_span: Span,
 256                 name: Ident, attrs: Vec<ast::Attribute>,
 257                 items: Vec<P<ast::Item>>) -> P<ast::Item>;
 258
 259     fn item_static(&self,
 260                    span: Span,
 261                    name: Ident,
 262                    ty: P<ast::Ty>,
 263                    mutbl: ast::Mutability,
 264                    expr: P<ast::Expr>)
 265                    -> P<ast::Item>;
 266
 267     fn item_const(&self,
 268                    span: Span,
 269                    name: Ident,
 270                    ty: P<ast::Ty>,
 271                    expr: P<ast::Expr>)
 272                    -> P<ast::Item>;
 273
 274     fn item_ty_poly(&self,
 275                     span: Span,
 276                     name: Ident,
 277                     ty: P<ast::Ty>,
 278                     generics: Generics) -> P<ast::Item>;
 279     fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> P<ast::Item>;
 280
 281     fn attribute(&self, sp: Span, mi: P<ast::MetaItem>) -> ast::Attribute;
 282
 283     fn meta_word(&self, sp: Span, w: InternedString) -> P<ast::MetaItem>;
 284     fn meta_list(&self,
 285                  sp: Span,
 286                  name: InternedString,
 287                  mis: Vec<P<ast::MetaItem>> )
 288                  -> P<ast::MetaItem>;
 289     fn meta_name_value(&self,
 290                        sp: Span,
 291                        name: InternedString,
 292                        value: ast::Lit_)
 293                        -> P<ast::MetaItem>;
 294
 295     fn item_use(&self, sp: Span,
 296                 vis: ast::Visibility, vp: P<ast::ViewPath>) -> P<ast::Item>;
 297     fn item_use_simple(&self, sp: Span, vis: ast::Visibility, path: ast::Path) -> P<ast::Item>;
 298     fn item_use_simple_(&self, sp: Span, vis: ast::Visibility,
 299                         ident: ast::Ident, path: ast::Path) -> P<ast::Item>;
 300     fn item_use_list(&self, sp: Span, vis: ast::Visibility,
 301                      path: Vec<ast::Ident>, imports: &[ast::Ident]) -> P<ast::Item>;
 302     fn item_use_glob(&self, sp: Span,
 303                      vis: ast::Visibility, path: Vec<ast::Ident>) -> P<ast::Item>;
 304 }
 305
 306 impl<'a> AstBuilder for ExtCtxt<'a> {
 307     fn path(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path {
 308         self.path_all(span, false, strs, Vec::new(), Vec::new(), Vec::new())
 309     }
 310     fn path_ident(&self, span: Span, id: ast::Ident) -> ast::Path {
 311         self.path(span, vec!(id))
 312     }
 313     fn path_global(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path {
 314         self.path_all(span, true, strs, Vec::new(), Vec::new(), Vec::new())
 315     }
 316     fn path_all(&self,
 317                 sp: Span,
 318                 global: bool,
 319                 mut idents: Vec<ast::Ident> ,
 320                 lifetimes: Vec<ast::Lifetime>,
 321                 types: Vec<P<ast::Ty>>,
 322                 bindings: Vec<P<ast::TypeBinding>> )
 323                 -> ast::Path {
 324         let last_identifier = idents.pop().unwrap();
 325         let mut segments: Vec<ast::PathSegment> = idents.into_iter()
 326                                                       .map(|ident| {
 327             ast::PathSegment {
 328                 identifier: ident,
 329                 parameters: ast::PathParameters::none(),
 330             }
 331         }).collect();
 332         segments.push(ast::PathSegment {
 333             identifier: last_identifier,
 334             parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
 335                 lifetimes: lifetimes,
 336                 types: OwnedSlice::from_vec(types),
 337                 bindings: OwnedSlice::from_vec(bindings),
 338             })
 339         });
 340         ast::Path {
 341             span: sp,
 342             global: global,
 343             segments: segments,
 344         }
 345     }
 346
 347     /// Constructs a qualified path.
 348     ///
 349     /// Constructs a path like `<self_type as trait_path>::ident`.
 350     fn qpath(&self,
 351              self_type: P<ast::Ty>,
 352              trait_path: ast::Path,
 353              ident: ast::Ident)
 354              -> (ast::QSelf, ast::Path) {
 355         self.qpath_all(self_type, trait_path, ident, vec![], vec![], vec![])
 356     }
 357
 358     /// Constructs a qualified path.
 359     ///
 360     /// Constructs a path like `<self_type as trait_path>::ident<'a, T, A=Bar>`.
 361     fn qpath_all(&self,
 362                  self_type: P<ast::Ty>,
 363                  trait_path: ast::Path,
 364                  ident: ast::Ident,
 365                  lifetimes: Vec<ast::Lifetime>,
 366                  types: Vec<P<ast::Ty>>,
 367                  bindings: Vec<P<ast::TypeBinding>>)
 368                  -> (ast::QSelf, ast::Path) {
 369         let mut path = trait_path;
 370         path.segments.push(ast::PathSegment {
 371             identifier: ident,
 372             parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
 373                 lifetimes: lifetimes,
 374                 types: OwnedSlice::from_vec(types),
 375                 bindings: OwnedSlice::from_vec(bindings),
 376             })
 377         });
 378
 379         (ast::QSelf {
 380             ty: self_type,
 381             position: path.segments.len() - 1
 382         }, path)
 383     }
 384
 385     fn ty_mt(&self, ty: P<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy {
 386         ast::MutTy {
 387             ty: ty,
 388             mutbl: mutbl
 389         }
 390     }
 391
 392     fn ty(&self, span: Span, ty: ast::Ty_) -> P<ast::Ty> {
 393         P(ast::Ty {
 394             id: ast::DUMMY_NODE_ID,
 395             span: span,
 396             node: ty
 397         })
 398     }
 399
 400     fn ty_path(&self, path: ast::Path) -> P<ast::Ty> {
 401         self.ty(path.span, ast::TyPath(None, path))
 402     }
 403
 404     fn ty_sum(&self, path: ast::Path, bounds: OwnedSlice<ast::TyParamBound>) -> P<ast::Ty> {
 405         self.ty(path.span,
 406                 ast::TyObjectSum(self.ty_path(path),
 407                                  bounds))
 408     }
 409
 410     // Might need to take bounds as an argument in the future, if you ever want
 411     // to generate a bounded existential trait type.
 412     fn ty_ident(&self, span: Span, ident: ast::Ident)
 413         -> P<ast::Ty> {
 414         self.ty_path(self.path_ident(span, ident))
 415     }
 416
 417     fn ty_rptr(&self,
 418                span: Span,
 419                ty: P<ast::Ty>,
 420                lifetime: Option<ast::Lifetime>,
 421                mutbl: ast::Mutability)
 422         -> P<ast::Ty> {
 423         self.ty(span,
 424                 ast::TyRptr(lifetime, self.ty_mt(ty, mutbl)))
 425     }
 426
 427     fn ty_ptr(&self,
 428               span: Span,
 429               ty: P<ast::Ty>,
 430               mutbl: ast::Mutability)
 431         -> P<ast::Ty> {
 432         self.ty(span,
 433                 ast::TyPtr(self.ty_mt(ty, mutbl)))
 434     }
 435
 436     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty> {
 437         self.ty_path(
 438             self.path_all(DUMMY_SP,
 439                           true,
 440                           self.std_path(&["option", "Option"]),
 441                           Vec::new(),
 442                           vec!( ty ),
 443                           Vec::new()))
 444     }
 445
 446     fn ty_field_imm(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::TypeField {
 447         ast::TypeField {
 448             ident: name,
 449             mt: ast::MutTy { ty: ty, mutbl: ast::MutImmutable },
 450             span: span,
 451         }
 452     }
 453
 454     fn ty_infer(&self, span: Span) -> P<ast::Ty> {
 455         self.ty(span, ast::TyInfer)
 456     }
 457
 458     fn typaram(&self,
 459                span: Span,
 460                id: ast::Ident,
 461                bounds: OwnedSlice<ast::TyParamBound>,
 462                default: Option<P<ast::Ty>>) -> ast::TyParam {
 463         ast::TyParam {
 464             ident: id,
 465             id: ast::DUMMY_NODE_ID,
 466             bounds: bounds,
 467             default: default,
 468             span: span
 469         }
 470     }
 471
 472     // these are strange, and probably shouldn't be used outside of
 473     // pipes. Specifically, the global version possible generates
 474     // incorrect code.
 475     fn ty_vars(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> {
 476         ty_params.iter().map(|p| self.ty_ident(DUMMY_SP, p.ident)).collect()
 477     }
 478
 479     fn ty_vars_global(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> {
 480         ty_params
 481             .iter()
 482             .map(|p| self.ty_path(self.path_global(DUMMY_SP, vec!(p.ident))))
 483             .collect()
 484     }
 485
 486     fn trait_ref(&self, path: ast::Path) -> ast::TraitRef {
 487         ast::TraitRef {
 488             path: path,
 489             ref_id: ast::DUMMY_NODE_ID,
 490         }
 491     }
 492
 493     fn poly_trait_ref(&self, span: Span, path: ast::Path) -> ast::PolyTraitRef {
 494         ast::PolyTraitRef {
 495             bound_lifetimes: Vec::new(),
 496             trait_ref: self.trait_ref(path),
 497             span: span,
 498         }
 499     }
 500
 501     fn typarambound(&self, path: ast::Path) -> ast::TyParamBound {
 502         ast::TraitTyParamBound(self.poly_trait_ref(path.span, path), ast::TraitBoundModifier::None)
 503     }
 504
 505     fn lifetime(&self, span: Span, name: ast::Name) -> ast::Lifetime {
 506         ast::Lifetime { id: ast::DUMMY_NODE_ID, span: span, name: name }
 507     }
 508
 509     fn lifetime_def(&self,
 510                     span: Span,
 511                     name: ast::Name,
 512                     bounds: Vec<ast::Lifetime>)
 513                     -> ast::LifetimeDef {
 514         ast::LifetimeDef {
 515             lifetime: self.lifetime(span, name),
 516             bounds: bounds
 517         }
 518     }
 519
 520     fn stmt_expr(&self, expr: P<ast::Expr>) -> P<ast::Stmt> {
 521         P(respan(expr.span, ast::StmtSemi(expr, ast::DUMMY_NODE_ID)))
 522     }
 523
 524     fn stmt_let(&self, sp: Span, mutbl: bool, ident: ast::Ident,
 525                 ex: P<ast::Expr>) -> P<ast::Stmt> {
 526         let pat = if mutbl {
 527             self.pat_ident_binding_mode(sp, ident, ast::BindByValue(ast::MutMutable))
 528         } else {
 529             self.pat_ident(sp, ident)
 530         };
 531         let local = P(ast::Local {
 532             pat: pat,
 533             ty: None,
 534             init: Some(ex),
 535             id: ast::DUMMY_NODE_ID,
 536             span: sp,
 537         });
 538         let decl = respan(sp, ast::DeclLocal(local));
 539         P(respan(sp, ast::StmtDecl(P(decl), ast::DUMMY_NODE_ID)))
 540     }
 541
 542     fn stmt_let_typed(&self,
 543                       sp: Span,
 544                       mutbl: bool,
 545                       ident: ast::Ident,
 546                       typ: P<ast::Ty>,
 547                       ex: P<ast::Expr>)
 548                       -> P<ast::Stmt> {
 549         let pat = if mutbl {
 550             self.pat_ident_binding_mode(sp, ident, ast::BindByValue(ast::MutMutable))
 551         } else {
 552             self.pat_ident(sp, ident)
 553         };
 554         let local = P(ast::Local {
 555             pat: pat,
 556             ty: Some(typ),
 557             init: Some(ex),
 558             id: ast::DUMMY_NODE_ID,
 559             span: sp,
 560         });
 561         let decl = respan(sp, ast::DeclLocal(local));
 562         P(respan(sp, ast::StmtDecl(P(decl), ast::DUMMY_NODE_ID)))
 563     }
 564
 565     fn block(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 566              expr: Option<P<Expr>>) -> P<ast::Block> {
 567         self.block_all(span, stmts, expr)
 568     }
 569
 570     fn stmt_item(&self, sp: Span, item: P<ast::Item>) -> P<ast::Stmt> {
 571         let decl = respan(sp, ast::DeclItem(item));
 572         P(respan(sp, ast::StmtDecl(P(decl), ast::DUMMY_NODE_ID)))
 573     }
 574
 575     fn block_expr(&self, expr: P<ast::Expr>) -> P<ast::Block> {
 576         self.block_all(expr.span, Vec::new(), Some(expr))
 577     }
 578     fn block_all(&self,
 579                  span: Span,
 580                  stmts: Vec<P<ast::Stmt>>,
 581                  expr: Option<P<ast::Expr>>) -> P<ast::Block> {
 582             P(ast::Block {
 583                stmts: stmts,
 584                expr: expr,
 585                id: ast::DUMMY_NODE_ID,
 586                rules: ast::DefaultBlock,
 587                span: span,
 588             })
 589     }
 590
 591     fn expr(&self, span: Span, node: ast::Expr_) -> P<ast::Expr> {
 592         P(ast::Expr {
 593             id: ast::DUMMY_NODE_ID,
 594             node: node,
 595             span: span,
 596         })
 597     }
 598
 599     fn expr_path(&self, path: ast::Path) -> P<ast::Expr> {
 600         self.expr(path.span, ast::ExprPath(None, path))
 601     }
 602
 603     /// Constructs a QPath expression.
 604     fn expr_qpath(&self, span: Span, qself: ast::QSelf, path: ast::Path) -> P<ast::Expr> {
 605         self.expr(span, ast::ExprPath(Some(qself), path))
 606     }
 607
 608     fn expr_ident(&self, span: Span, id: ast::Ident) -> P<ast::Expr> {
 609         self.expr_path(self.path_ident(span, id))
 610     }
 611     fn expr_self(&self, span: Span) -> P<ast::Expr> {
 612         self.expr_ident(span, special_idents::self_)
 613     }
 614
 615     fn expr_binary(&self, sp: Span, op: ast::BinOp_,
 616                    lhs: P<ast::Expr>, rhs: P<ast::Expr>) -> P<ast::Expr> {
 617         self.expr(sp, ast::ExprBinary(Spanned { node: op, span: sp }, lhs, rhs))
 618     }
 619
 620     fn expr_deref(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
 621         self.expr_unary(sp, ast::UnDeref, e)
 622     }
 623     fn expr_unary(&self, sp: Span, op: ast::UnOp, e: P<ast::Expr>) -> P<ast::Expr> {
 624         self.expr(sp, ast::ExprUnary(op, e))
 625     }
 626
 627     fn expr_field_access(&self, sp: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr> {
 628         let field_span = Span {
 629             lo: sp.lo - Pos::from_usize(ident.name.as_str().len()),
 630             hi: sp.hi,
 631             expn_id: sp.expn_id,
 632         };
 633
 634         let id = Spanned { node: ident, span: field_span };
 635         self.expr(sp, ast::ExprField(expr, id))
 636     }
 637     fn expr_tup_field_access(&self, sp: Span, expr: P<ast::Expr>, idx: usize) -> P<ast::Expr> {
 638         let field_span = Span {
 639             lo: sp.lo - Pos::from_usize(idx.to_string().len()),
 640             hi: sp.hi,
 641             expn_id: sp.expn_id,
 642         };
 643
 644         let id = Spanned { node: idx, span: field_span };
 645         self.expr(sp, ast::ExprTupField(expr, id))
 646     }
 647     fn expr_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
 648         self.expr(sp, ast::ExprAddrOf(ast::MutImmutable, e))
 649     }
 650     fn expr_mut_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
 651         self.expr(sp, ast::ExprAddrOf(ast::MutMutable, e))
 652     }
 653
 654     fn expr_call(&self, span: Span, expr: P<ast::Expr>, args: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 655         self.expr(span, ast::ExprCall(expr, args))
 656     }
 657     fn expr_call_ident(&self, span: Span, id: ast::Ident,
 658                        args: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 659         self.expr(span, ast::ExprCall(self.expr_ident(span, id), args))
 660     }
 661     fn expr_call_global(&self, sp: Span, fn_path: Vec<ast::Ident> ,
 662                       args: Vec<P<ast::Expr>> ) -> P<ast::Expr> {
 663         let pathexpr = self.expr_path(self.path_global(sp, fn_path));
 664         self.expr_call(sp, pathexpr, args)
 665     }
 666     fn expr_method_call(&self, span: Span,
 667                         expr: P<ast::Expr>,
 668                         ident: ast::Ident,
 669                         mut args: Vec<P<ast::Expr>> ) -> P<ast::Expr> {
 670         let id = Spanned { node: ident, span: span };
 671         args.insert(0, expr);
 672         self.expr(span, ast::ExprMethodCall(id, Vec::new(), args))
 673     }
 674     fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr> {
 675         self.expr(b.span, ast::ExprBlock(b))
 676     }
 677     fn field_imm(&self, span: Span, name: Ident, e: P<ast::Expr>) -> ast::Field {
 678         ast::Field { ident: respan(span, name), expr: e, span: span }
 679     }
 680     fn expr_struct(&self, span: Span, path: ast::Path, fields: Vec<ast::Field>) -> P<ast::Expr> {
 681         self.expr(span, ast::ExprStruct(path, fields, None))
 682     }
 683     fn expr_struct_ident(&self, span: Span,
 684                          id: ast::Ident, fields: Vec<ast::Field>) -> P<ast::Expr> {
 685         self.expr_struct(span, self.path_ident(span, id), fields)
 686     }
 687
 688     fn expr_lit(&self, sp: Span, lit: ast::Lit_) -> P<ast::Expr> {
 689         self.expr(sp, ast::ExprLit(P(respan(sp, lit))))
 690     }
 691     fn expr_usize(&self, span: Span, i: usize) -> P<ast::Expr> {
 692         self.expr_lit(span, ast::LitInt(i as u64, ast::UnsignedIntLit(ast::TyUs)))
 693     }
 694     fn expr_isize(&self, sp: Span, i: isize) -> P<ast::Expr> {
 695         self.expr_lit(sp, ast::LitInt(i as u64, ast::SignedIntLit(ast::TyIs,
 696                                                                   ast::Sign::new(i))))
 697     }
 698     fn expr_u32(&self, sp: Span, u: u32) -> P<ast::Expr> {
 699         self.expr_lit(sp, ast::LitInt(u as u64, ast::UnsignedIntLit(ast::TyU32)))
 700     }
 701     fn expr_u8(&self, sp: Span, u: u8) -> P<ast::Expr> {
 702         self.expr_lit(sp, ast::LitInt(u as u64, ast::UnsignedIntLit(ast::TyU8)))
 703     }
 704     fn expr_bool(&self, sp: Span, value: bool) -> P<ast::Expr> {
 705         self.expr_lit(sp, ast::LitBool(value))
 706     }
 707
 708     fn expr_vec(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 709         self.expr(sp, ast::ExprVec(exprs))
 710     }
 711     fn expr_vec_ng(&self, sp: Span) -> P<ast::Expr> {
 712         self.expr_call_global(sp, self.std_path(&["vec", "Vec", "new"]),
 713                               Vec::new())
 714     }
 715     fn expr_vec_slice(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 716         self.expr_addr_of(sp, self.expr_vec(sp, exprs))
 717     }
 718     fn expr_str(&self, sp: Span, s: InternedString) -> P<ast::Expr> {
 719         self.expr_lit(sp, ast::LitStr(s, ast::CookedStr))
 720     }
 721
 722     fn expr_cast(&self, sp: Span, expr: P<ast::Expr>, ty: P<ast::Ty>) -> P<ast::Expr> {
 723         self.expr(sp, ast::ExprCast(expr, ty))
 724     }
 725
 726
 727     fn expr_some(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 728         let some = self.std_path(&["option", "Option", "Some"]);
 729         self.expr_call_global(sp, some, vec!(expr))
 730     }
 731
 732     fn expr_none(&self, sp: Span) -> P<ast::Expr> {
 733         let none = self.std_path(&["option", "Option", "None"]);
 734         let none = self.path_global(sp, none);
 735         self.expr_path(none)
 736     }
 737
 738
 739     fn expr_break(&self, sp: Span) -> P<ast::Expr> {
 740         self.expr(sp, ast::ExprBreak(None))
 741     }
 742
 743
 744     fn expr_tuple(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 745         self.expr(sp, ast::ExprTup(exprs))
 746     }
 747
 748     fn expr_fail(&self, span: Span, msg: InternedString) -> P<ast::Expr> {
 749         let loc = self.codemap().lookup_char_pos(span.lo);
 750         let expr_file = self.expr_str(span,
 751                                       token::intern_and_get_ident(&loc.file.name));
 752         let expr_line = self.expr_u32(span, loc.line as u32);
 753         let expr_file_line_tuple = self.expr_tuple(span, vec!(expr_file, expr_line));
 754         let expr_file_line_ptr = self.expr_addr_of(span, expr_file_line_tuple);
 755         self.expr_call_global(
 756             span,
 757             self.std_path(&["rt", "begin_unwind"]),
 758             vec!(
 759                 self.expr_str(span, msg),
 760                 expr_file_line_ptr))
 761     }
 762
 763     fn expr_unreachable(&self, span: Span) -> P<ast::Expr> {
 764         self.expr_fail(span,
 765                        InternedString::new(
 766                            "internal error: entered unreachable code"))
 767     }
 768
 769     fn expr_ok(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 770         let ok = self.std_path(&["result", "Result", "Ok"]);
 771         self.expr_call_global(sp, ok, vec!(expr))
 772     }
 773
 774     fn expr_err(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 775         let err = self.std_path(&["result", "Result", "Err"]);
 776         self.expr_call_global(sp, err, vec!(expr))
 777     }
 778
 779     fn expr_try(&self, sp: Span, head: P<ast::Expr>) -> P<ast::Expr> {
 780         let ok = self.std_path(&["result", "Result", "Ok"]);
 781         let ok_path = self.path_global(sp, ok);
 782         let err = self.std_path(&["result", "Result", "Err"]);
 783         let err_path = self.path_global(sp, err);
 784
 785         let binding_variable = self.ident_of("__try_var");
 786         let binding_pat = self.pat_ident(sp, binding_variable);
 787         let binding_expr = self.expr_ident(sp, binding_variable);
 788
 789         // Ok(__try_var) pattern
 790         let ok_pat = self.pat_enum(sp, ok_path, vec!(binding_pat.clone()));
 791
 792         // Err(__try_var)  (pattern and expression resp.)
 793         let err_pat = self.pat_enum(sp, err_path.clone(), vec!(binding_pat));
 794         let err_inner_expr = self.expr_call(sp, self.expr_path(err_path),
 795                                             vec!(binding_expr.clone()));
 796         // return Err(__try_var)
 797         let err_expr = self.expr(sp, ast::ExprRet(Some(err_inner_expr)));
 798
 799         // Ok(__try_var) => __try_var
 800         let ok_arm = self.arm(sp, vec!(ok_pat), binding_expr);
 801         // Err(__try_var) => return Err(__try_var)
 802         let err_arm = self.arm(sp, vec!(err_pat), err_expr);
 803
 804         // match head { Ok() => ..., Err() => ... }
 805         self.expr_match(sp, head, vec!(ok_arm, err_arm))
 806     }
 807
 808
 809     fn pat(&self, span: Span, pat: ast::Pat_) -> P<ast::Pat> {
 810         P(ast::Pat { id: ast::DUMMY_NODE_ID, node: pat, span: span })
 811     }
 812     fn pat_wild(&self, span: Span) -> P<ast::Pat> {
 813         self.pat(span, ast::PatWild(ast::PatWildSingle))
 814     }
 815     fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat> {
 816         self.pat(span, ast::PatLit(expr))
 817     }
 818     fn pat_ident(&self, span: Span, ident: ast::Ident) -> P<ast::Pat> {
 819         self.pat_ident_binding_mode(span, ident, ast::BindByValue(ast::MutImmutable))
 820     }
 821
 822     fn pat_ident_binding_mode(&self,
 823                               span: Span,
 824                               ident: ast::Ident,
 825                               bm: ast::BindingMode) -> P<ast::Pat> {
 826         let pat = ast::PatIdent(bm, Spanned{span: span, node: ident}, None);
 827         self.pat(span, pat)
 828     }
 829     fn pat_enum(&self, span: Span, path: ast::Path, subpats: Vec<P<ast::Pat>>) -> P<ast::Pat> {
 830         let pat = ast::PatEnum(path, Some(subpats));
 831         self.pat(span, pat)
 832     }
 833     fn pat_struct(&self, span: Span,
 834                   path: ast::Path, field_pats: Vec<Spanned<ast::FieldPat>>) -> P<ast::Pat> {
 835         let pat = ast::PatStruct(path, field_pats, false);
 836         self.pat(span, pat)
 837     }
 838     fn pat_tuple(&self, span: Span, pats: Vec<P<ast::Pat>>) -> P<ast::Pat> {
 839         self.pat(span, ast::PatTup(pats))
 840     }
 841
 842     fn pat_some(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
 843         let some = self.std_path(&["option", "Option", "Some"]);
 844         let path = self.path_global(span, some);
 845         self.pat_enum(span, path, vec!(pat))
 846     }
 847
 848     fn pat_none(&self, span: Span) -> P<ast::Pat> {
 849         let some = self.std_path(&["option", "Option", "None"]);
 850         let path = self.path_global(span, some);
 851         self.pat_enum(span, path, vec!())
 852     }
 853
 854     fn pat_ok(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
 855         let some = self.std_path(&["result", "Result", "Ok"]);
 856         let path = self.path_global(span, some);
 857         self.pat_enum(span, path, vec!(pat))
 858     }
 859
 860     fn pat_err(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
 861         let some = self.std_path(&["result", "Result", "Err"]);
 862         let path = self.path_global(span, some);
 863         self.pat_enum(span, path, vec!(pat))
 864     }
 865
 866     fn arm(&self, _span: Span, pats: Vec<P<ast::Pat>>, expr: P<ast::Expr>) -> ast::Arm {
 867         ast::Arm {
 868             attrs: vec!(),
 869             pats: pats,
 870             guard: None,
 871             body: expr
 872         }
 873     }
 874
 875     fn arm_unreachable(&self, span: Span) -> ast::Arm {
 876         self.arm(span, vec!(self.pat_wild(span)), self.expr_unreachable(span))
 877     }
 878
 879     fn expr_match(&self, span: Span, arg: P<ast::Expr>, arms: Vec<ast::Arm>) -> P<Expr> {
 880         self.expr(span, ast::ExprMatch(arg, arms, ast::MatchSource::Normal))
 881     }
 882
 883     fn expr_if(&self, span: Span, cond: P<ast::Expr>,
 884                then: P<ast::Expr>, els: Option<P<ast::Expr>>) -> P<ast::Expr> {
 885         let els = els.map(|x| self.expr_block(self.block_expr(x)));
 886         self.expr(span, ast::ExprIf(cond, self.block_expr(then), els))
 887     }
 888
 889     fn expr_loop(&self, span: Span, block: P<ast::Block>) -> P<ast::Expr> {
 890         self.expr(span, ast::ExprLoop(block, None))
 891     }
 892
 893     fn lambda_fn_decl(&self, span: Span,
 894                       fn_decl: P<ast::FnDecl>, blk: P<ast::Block>) -> P<ast::Expr> {
 895         self.expr(span, ast::ExprClosure(ast::CaptureByRef, fn_decl, blk))
 896     }
 897     fn lambda(&self, span: Span, ids: Vec<ast::Ident>, blk: P<ast::Block>) -> P<ast::Expr> {
 898         let fn_decl = self.fn_decl(
 899             ids.iter().map(|id| self.arg(span, *id, self.ty_infer(span))).collect(),
 900             self.ty_infer(span));
 901
 902         self.expr(span, ast::ExprClosure(ast::CaptureByRef, fn_decl, blk))
 903     }
 904     fn lambda0(&self, span: Span, blk: P<ast::Block>) -> P<ast::Expr> {
 905         self.lambda(span, Vec::new(), blk)
 906     }
 907
 908     fn lambda1(&self, span: Span, blk: P<ast::Block>, ident: ast::Ident) -> P<ast::Expr> {
 909         self.lambda(span, vec!(ident), blk)
 910     }
 911
 912     fn lambda_expr(&self, span: Span, ids: Vec<ast::Ident>,
 913                    expr: P<ast::Expr>) -> P<ast::Expr> {
 914         self.lambda(span, ids, self.block_expr(expr))
 915     }
 916     fn lambda_expr_0(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 917         self.lambda0(span, self.block_expr(expr))
 918     }
 919     fn lambda_expr_1(&self, span: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr> {
 920         self.lambda1(span, self.block_expr(expr), ident)
 921     }
 922
 923     fn lambda_stmts(&self,
 924                     span: Span,
 925                     ids: Vec<ast::Ident>,
 926                     stmts: Vec<P<ast::Stmt>>)
 927                     -> P<ast::Expr> {
 928         self.lambda(span, ids, self.block(span, stmts, None))
 929     }
 930     fn lambda_stmts_0(&self, span: Span, stmts: Vec<P<ast::Stmt>>) -> P<ast::Expr> {
 931         self.lambda0(span, self.block(span, stmts, None))
 932     }
 933     fn lambda_stmts_1(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 934                       ident: ast::Ident) -> P<ast::Expr> {
 935         self.lambda1(span, self.block(span, stmts, None), ident)
 936     }
 937
 938     fn arg(&self, span: Span, ident: ast::Ident, ty: P<ast::Ty>) -> ast::Arg {
 939         let arg_pat = self.pat_ident(span, ident);
 940         ast::Arg {
 941             ty: ty,
 942             pat: arg_pat,
 943             id: ast::DUMMY_NODE_ID
 944         }
 945     }
 946
 947     // FIXME unused self
 948     fn fn_decl(&self, inputs: Vec<ast::Arg>, output: P<ast::Ty>) -> P<ast::FnDecl> {
 949         P(ast::FnDecl {
 950             inputs: inputs,
 951             output: ast::Return(output),
 952             variadic: false
 953         })
 954     }
 955
 956     fn item(&self, span: Span, name: Ident,
 957             attrs: Vec<ast::Attribute>, node: ast::Item_) -> P<ast::Item> {
 958         // FIXME: Would be nice if our generated code didn't violate
 959         // Rust coding conventions
 960         P(ast::Item {
 961             ident: name,
 962             attrs: attrs,
 963             id: ast::DUMMY_NODE_ID,
 964             node: node,
 965             vis: ast::Inherited,
 966             span: span
 967         })
 968     }
 969
 970     fn item_fn_poly(&self,
 971                     span: Span,
 972                     name: Ident,
 973                     inputs: Vec<ast::Arg> ,
 974                     output: P<ast::Ty>,
 975                     generics: Generics,
 976                     body: P<ast::Block>) -> P<ast::Item> {
 977         self.item(span,
 978                   name,
 979                   Vec::new(),
 980                   ast::ItemFn(self.fn_decl(inputs, output),
 981                               ast::Unsafety::Normal,
 982                               ast::Constness::NotConst,
 983                               abi::Rust,
 984                               generics,
 985                               body))
 986     }
 987
 988     fn item_fn(&self,
 989                span: Span,
 990                name: Ident,
 991                inputs: Vec<ast::Arg> ,
 992                output: P<ast::Ty>,
 993                body: P<ast::Block>
 994               ) -> P<ast::Item> {
 995         self.item_fn_poly(
 996             span,
 997             name,
 998             inputs,
 999             output,
1000             ast_util::empty_generics(),
1001             body)
1002     }
1003
1004     fn variant(&self, span: Span, name: Ident, tys: Vec<P<ast::Ty>> ) -> ast::Variant {
1005         let args = tys.into_iter().map(|ty| {
1006             ast::VariantArg { ty: ty, id: ast::DUMMY_NODE_ID }
1007         }).collect();
1008
1009         respan(span,
1010                ast::Variant_ {
1011                    name: name,
1012                    attrs: Vec::new(),
1013                    kind: ast::TupleVariantKind(args),
1014                    id: ast::DUMMY_NODE_ID,
1015                    disr_expr: None,
1016                    vis: ast::Public
1017                })
1018     }
1019
1020     fn item_enum_poly(&self, span: Span, name: Ident,
1021                       enum_definition: ast::EnumDef,
1022                       generics: Generics) -> P<ast::Item> {
1023         self.item(span, name, Vec::new(), ast::ItemEnum(enum_definition, generics))
1024     }
1025
1026     fn item_enum(&self, span: Span, name: Ident,
1027                  enum_definition: ast::EnumDef) -> P<ast::Item> {
1028         self.item_enum_poly(span, name, enum_definition,
1029                             ast_util::empty_generics())
1030     }
1031
1032     fn item_struct(&self, span: Span, name: Ident,
1033                    struct_def: ast::StructDef) -> P<ast::Item> {
1034         self.item_struct_poly(
1035             span,
1036             name,
1037             struct_def,
1038             ast_util::empty_generics()
1039         )
1040     }
1041
1042     fn item_struct_poly(&self, span: Span, name: Ident,
1043         struct_def: ast::StructDef, generics: Generics) -> P<ast::Item> {
1044         self.item(span, name, Vec::new(), ast::ItemStruct(P(struct_def), generics))
1045     }
1046
1047     fn item_mod(&self, span: Span, inner_span: Span, name: Ident,
1048                 attrs: Vec<ast::Attribute>,
1049                 items: Vec<P<ast::Item>>) -> P<ast::Item> {
1050         self.item(
1051             span,
1052             name,
1053             attrs,
1054             ast::ItemMod(ast::Mod {
1055                 inner: inner_span,
1056                 items: items,
1057             })
1058         )
1059     }
1060
1061     fn item_static(&self,
1062                    span: Span,
1063                    name: Ident,
1064                    ty: P<ast::Ty>,
1065                    mutbl: ast::Mutability,
1066                    expr: P<ast::Expr>)
1067                    -> P<ast::Item> {
1068         self.item(span, name, Vec::new(), ast::ItemStatic(ty, mutbl, expr))
1069     }
1070
1071     fn item_const(&self,
1072                   span: Span,
1073                   name: Ident,
1074                   ty: P<ast::Ty>,
1075                   expr: P<ast::Expr>)
1076                   -> P<ast::Item> {
1077         self.item(span, name, Vec::new(), ast::ItemConst(ty, expr))
1078     }
1079
1080     fn item_ty_poly(&self, span: Span, name: Ident, ty: P<ast::Ty>,
1081                     generics: Generics) -> P<ast::Item> {
1082         self.item(span, name, Vec::new(), ast::ItemTy(ty, generics))
1083     }
1084
1085     fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> P<ast::Item> {
1086         self.item_ty_poly(span, name, ty, ast_util::empty_generics())
1087     }
1088
1089     fn attribute(&self, sp: Span, mi: P<ast::MetaItem>) -> ast::Attribute {
1090         respan(sp, ast::Attribute_ {
1091             id: attr::mk_attr_id(),
1092             style: ast::AttrOuter,
1093             value: mi,
1094             is_sugared_doc: false,
1095         })
1096     }
1097
1098     fn meta_word(&self, sp: Span, w: InternedString) -> P<ast::MetaItem> {
1099         P(respan(sp, ast::MetaWord(w)))
1100     }
1101     fn meta_list(&self,
1102                  sp: Span,
1103                  name: InternedString,
1104                  mis: Vec<P<ast::MetaItem>> )
1105                  -> P<ast::MetaItem> {
1106         P(respan(sp, ast::MetaList(name, mis)))
1107     }
1108     fn meta_name_value(&self,
1109                        sp: Span,
1110                        name: InternedString,
1111                        value: ast::Lit_)
1112                        -> P<ast::MetaItem> {
1113         P(respan(sp, ast::MetaNameValue(name, respan(sp, value))))
1114     }
1115
1116     fn item_use(&self, sp: Span,
1117                 vis: ast::Visibility, vp: P<ast::ViewPath>) -> P<ast::Item> {
1118         P(ast::Item {
1119             id: ast::DUMMY_NODE_ID,
1120             ident: special_idents::invalid,
1121             attrs: vec![],
1122             node: ast::ItemUse(vp),
1123             vis: vis,
1124             span: sp
1125         })
1126     }
1127
1128     fn item_use_simple(&self, sp: Span, vis: ast::Visibility, path: ast::Path) -> P<ast::Item> {
1129         let last = path.segments.last().unwrap().identifier;
1130         self.item_use_simple_(sp, vis, last, path)
1131     }
1132
1133     fn item_use_simple_(&self, sp: Span, vis: ast::Visibility,
1134                         ident: ast::Ident, path: ast::Path) -> P<ast::Item> {
1135         self.item_use(sp, vis,
1136                       P(respan(sp,
1137                                ast::ViewPathSimple(ident,
1138                                                    path))))
1139     }
1140
1141     fn item_use_list(&self, sp: Span, vis: ast::Visibility,
1142                      path: Vec<ast::Ident>, imports: &[ast::Ident]) -> P<ast::Item> {
1143         let imports = imports.iter().map(|id| {
1144             respan(sp, ast::PathListIdent { name: *id, rename: None, id: ast::DUMMY_NODE_ID })
1145         }).collect();
1146
1147         self.item_use(sp, vis,
1148                       P(respan(sp,
1149                                ast::ViewPathList(self.path(sp, path),
1150                                                  imports))))
1151     }
1152
1153     fn item_use_glob(&self, sp: Span,
1154                      vis: ast::Visibility, path: Vec<ast::Ident>) -> P<ast::Item> {
1155         self.item_use(sp, vis,
1156                       P(respan(sp,
1157                                ast::ViewPathGlob(self.path(sp, path)))))
1158     }
1159 }