src/libsyntax/ext/deriving/bounds.rs

   1 // Copyright 2014 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 ast::MetaItem;
  12 use codemap::Span;
  13 use ext::base::{ExtCtxt, Annotatable};
  14 use ext::deriving::generic::*;
  15 use ext::deriving::generic::ty::*;
  16
  17 pub fn expand_deriving_unsafe_bound(cx: &mut ExtCtxt,
  18                                     span: Span,
  19                                     _: &MetaItem,
  20                                     _: &Annotatable,
  21                                     _: &mut FnMut(Annotatable))
  22 {
  23     cx.span_err(span, "this unsafe trait should be implemented explicitly");
  24 }
  25
  26 pub fn expand_deriving_copy(cx: &mut ExtCtxt,
  27                             span: Span,
  28                             mitem: &MetaItem,
  29                             item: &Annotatable,
  30                             push: &mut FnMut(Annotatable))
  31 {
  32     let path = Path::new(vec![
  33         if cx.use_std { "std" } else { "core" },
  34         "marker",
  35         "Copy",
  36     ]);
  37
  38     let trait_def = TraitDef {
  39         span: span,
  40         attributes: Vec::new(),
  41         path: path,
  42         additional_bounds: Vec::new(),
  43         generics: LifetimeBounds::empty(),
  44         methods: Vec::new(),
  45         associated_types: Vec::new(),
  46     };
  47
  48     trait_def.expand(cx, mitem, item, push);
  49 }