{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"///"}]}
    /// and returns `None` if the next token is not literal at all.
    /// In case of error returns `Some(lit)` if the next token is a literal with a wrong kind,
    pub fn parse_str_lit(&mut self) -> Result<ast::StrLit, Option<MetaItemLit>> {