{"ast_node_type":"function","tokens":[{"end":91,"kind":"keyword","start":0,"text":"pub"}]}
    pub fn find_generic_arg(&self, generic_arg: &ast::GenericArg) -> Option<GenericParam> {
    /// Find the params corresponded to generic arg
        self.generic_params().find_map(move |param| match (&param, &generic_arg) {