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 deriving::generic::*;
  12 use deriving::generic::ty::*;
  13
  14 use syntax::ast::MetaItem;
  15 use syntax::ext::base::{Annotatable, ExtCtxt};
  16 use syntax_pos::Span;
  17
  18 pub fn expand_deriving_unsafe_bound(cx: &mut ExtCtxt,
  19                                     span: Span,
  20                                     _: &MetaItem,
  21                                     _: &Annotatable,
  22                                     _: &mut FnMut(Annotatable)) {
  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     let mut v = cx.crate_root.map(|s| vec![s]).unwrap_or(Vec::new());
  32     v.push("marker");
  33     v.push("Copy");
  34     let path = Path::new(v);
  35
  36     let trait_def = TraitDef {
  37         span: span,
  38         attributes: Vec::new(),
  39         path: path,
  40         additional_bounds: Vec::new(),
  41         generics: LifetimeBounds::empty(),
  42         is_unsafe: false,
  43         methods: Vec::new(),
  44         associated_types: Vec::new(),
  45     };
  46
  47     trait_def.expand(cx, mitem, item, push);
  48 }