use crate::parse_in;
+use rustc_ast::ast::{self, Attribute, MacArgs, MacDelimiter, MetaItem, MetaItemKind};
+use rustc_ast::tokenstream::DelimSpan;
use rustc_errors::{Applicability, PResult};
use rustc_feature::{AttributeTemplate, BUILTIN_ATTRIBUTE_MAP};
use rustc_session::lint::builtin::ILL_FORMED_ATTRIBUTE_INPUT;
use rustc_session::parse::ParseSess;
use rustc_span::{sym, Symbol};
-use syntax::ast::{self, Attribute, MacArgs, MacDelimiter, MetaItem, MetaItemKind};
-use syntax::tokenstream::DelimSpan;
pub fn check_meta(sess: &ParseSess, attr: &Attribute) {
if attr.is_doc_comment() {