-use rustc::hir;
-use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
-use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::ty::query::Providers;
use rustc::ty::TyCtxt;
-use syntax::attr;
-use syntax::symbol::sym;
+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;
pub fn find(tcx: TyCtxt<'_>) -> Option<DefId> {
tcx.proc_macro_decls_static(LOCAL_CRATE)