use rustc::mir::mono::CodegenUnitNameBuilder;
use rustc::ty::TyCtxt;
+use rustc_ast::ast;
use rustc_hir::def_id::LOCAL_CRATE;
use rustc_session::cgu_reuse_tracker::*;
use rustc_span::symbol::{sym, Symbol};
use std::collections::BTreeSet;
-use syntax::ast;
pub fn assert_module_sources(tcx: TyCtxt<'_>) {
tcx.dep_graph.with_ignore(|| {