if_chain! {
if let ExprKind::MethodCall(method, _, len_args, _) = expr.kind;
if len_args.len() == 1;
- if method.ident.name == sym!(len);
+ if method.ident.name == sym::len;
if let ExprKind::Path(QPath::Resolved(_, path)) = len_args[0].kind;
if path.segments.len() == 1;
if path.segments[0].ident.name == var;