{"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
impl<'tcx> BinOp {
    pub fn ty(&self, tcx: TyCtxt<'tcx>, lhs_ty: Ty<'tcx>, rhs_ty: Ty<'tcx>) -> Ty<'tcx> {