message: Ignore extern crate decls
diff: @@ -161,6 +161,7 @@ fn process_module(file: SFile) -> LineAnalysis {
  let mut analysis = LineAnalysis::new();
  for item in &file.items {
  match item {
  + Item::ExternCrate(i) => analysis.ignore_span(&i.extern_token.0),
  Item::Use(i) => analysis.ignore_span(&i.use_token.0),
  _ =>{}
  }
  