use rustc::ty::query::Providers;
use rustc::ty::TyCtxt;
+use rustc_ast::attr;
use rustc_hir as hir;
use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
use rustc_hir::itemlikevisit::ItemLikeVisitor;
use rustc_span::symbol::sym;
use rustc_span::Span;
-use syntax::attr;
struct RegistrarFinder {
registrars: Vec<(hir::HirId, Span)>,