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use ast::{MetaItem, MetaWord, Item};
use codemap::Span;
use ext::base::ExtCtxt;
use ext::deriving::generic::*;
use ext::deriving::generic::ty::*;
use ptr::P;
pub fn expand_deriving_bound<F>(cx: &mut ExtCtxt,
span: Span,
mitem: &MetaItem,
item: &Item,
push: F) where
F: FnOnce(P<Item>),
{
let name = match mitem.node {
MetaWord(ref tname) => {
match tname.get() {
"Copy" => "Copy",
"Send" | "Sync" => {
return cx.span_err(span,
format!("{} is an unsafe trait and it \
should be implemented explicitly", *tname)[])
}
ref tname => {
cx.span_bug(span,
format!("expected built-in trait name but \
found {}", *tname)[])
}
}
},
_ => {
return cx.span_err(span, "unexpected value in deriving, expected \
a trait")
}
};
let trait_def = TraitDef {
span: span,
attributes: Vec::new(),
path: Path::new(vec!("std", "kinds", name)),
additional_bounds: Vec::new(),
generics: LifetimeBounds::empty(),
methods: vec!()
};
trait_def.expand(cx, mitem, item, push)
}