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use rustc::dep_graph::DepNode;
use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::hir::map::Map;
use rustc::hir;
use syntax::ast;
use syntax::attr;
pub fn find(hir_map: &Map) -> Option<ast::NodeId> {
let _task = hir_map.dep_graph.in_task(DepNode::PluginRegistrar);
let krate = hir_map.krate();
let mut finder = Finder { registrar: None };
krate.visit_all_item_likes(&mut finder);
finder.registrar
}
struct Finder {
registrar: Option<ast::NodeId>,
}
impl<'v> ItemLikeVisitor<'v> for Finder {
fn visit_item(&mut self, item: &hir::Item) {
if attr::contains_name(&item.attrs, "rustc_derive_registrar") {
self.registrar = Some(item.id);
}
}
fn visit_trait_item(&mut self, _trait_item: &hir::TraitItem) {
}
fn visit_impl_item(&mut self, _impl_item: &hir::ImplItem) {
}
}