Function parse_fragment 

pub fn parse_fragment<'ast, 'name>(
    source: &str,
    arena: &'ast AstArena,
    names: &mut AstNameTable<'name>,
    options: ParseOptions,
    resume: FragmentParseResumeSettings<'ast>,
) -> Result<ParseResult<'ast>, ParseErrors>
where
    'name: 'ast,