{"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"///"}]}
    /// for better diagnostics and suggestions.
    /// Parses a field identifier. Specialized version of `parse_ident_common`
    fn parse_field_ident(&mut self, adt_ty: &str, lo: Span) -> PResult<'a, Ident> {