import base::*; fn expand_syntax_ext(cx: ext_ctxt, sp: codemap::span, arg: ast::mac_arg, _body: ast::mac_body) -> @ast::expr { let args = get_mac_args_no_max(cx,sp,arg,1u,"concat_idents"); let mut res = ""; for args.each |e| { res += *expr_to_ident(cx, e, "expected an ident"); } ret @{id: cx.next_id(), callee_id: cx.next_id(), node: ast::expr_path(@{span: sp, global: false, idents: ~[@res], rp: none, types: ~[]}), span: sp}; }