use rustc::dep_graph::{DepGraphQuery, DepKind, DepNode};
use rustc::hir::map::Map;
use rustc::ty::TyCtxt;
+use rustc_ast::ast;
use rustc_data_structures::fx::FxHashSet;
use rustc_data_structures::graph::implementation::{Direction, NodeIndex, INCOMING, OUTGOING};
use rustc_hir as hir;
use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
use rustc_span::symbol::sym;
use rustc_span::Span;
-use syntax::ast;
use std::env;
use std::fs::{self, File};