{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"if"}]}
        if let Some((&ty::Ref(_, _, from_mutbl), &ty::Ref(_, _, to_mutbl))) =
    fn check_expr(&mut self, cx: &LateContext<'_>, expr: &hir::Expr<'_>) {
            get_transmute_from_to(cx, expr).map(|(ty1, ty2)| (ty1.kind(), ty2.kind()))