{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"///"}]}
    /// FIXME: Move this check out of typeck, since it'll easily cycle when revealing opaques,
impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
    /// and we shouldn't need to check anything here if the typeck results are tainted.