use rustc_attr as attr;
use rustc_errors::emitter::{Emitter, EmitterWriter};
use rustc_errors::json::JsonEmitter;
use rustc_span::source_map;
use rustc_span::symbol::sym;
use rustc_span::DUMMY_SP;
use rustc_attr as attr;
use rustc_errors::emitter::{Emitter, EmitterWriter};
use rustc_errors::json::JsonEmitter;
use rustc_span::source_map;
use rustc_span::symbol::sym;
use rustc_span::DUMMY_SP;