{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
    let parser_input = to_parser_input(buffer, &mut |_ctx| edition);
    // FIXME: Pass the correct edition per token. Due to the split between mbe and hir-expand it's complicated.
    let tree_traversal = entry_point.parse(&parser_input, edition);