{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"///"}]}
    /// Provides a way to concatenate identifiers using metavariable expressions.
    (unstable, macro_metavar_expr, "1.61.0", Some(83527)),
    (unstable, macro_metavar_expr_concat, "1.81.0", Some(124225)),