use rustc_expand::base::{MacroExpanderFn, Resolver, SyntaxExtension, SyntaxExtensionKind};
use rustc_expand::proc_macro::BangProcMacro;
+use rustc_span::edition::Edition;
use rustc_span::symbol::sym;
use syntax::ast::Ident;
-use syntax::edition::Edition;
mod asm;
mod assert;