{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
        let sym_name = sess.generate_proc_macro_decls_symbol(stable_crate_id);
    ) -> Result<&'static [ProcMacro], CrateError> {
        debug!("trying to dlsym proc_macros {} for symbol `{}`", path.display(), sym_name);