{"ast_node_type":"variable","tokens":[{"end":27,"kind":"keyword","start":0,"text":"let"}]}
        let tcx = self.tcx;
    fn lower_anon_const_to_const_arg_direct(&mut self, anon: &AnonConst) -> hir::ConstArg<'hir> {
        // Unwrap a block, so that e.g. `{ P }` is recognised as a parameter. Const arguments