Function mz_repr::strconv::lex_unquoted_element

source ยท 
fn lex_unquoted_element<'a>(
    buf: &mut LexBuf<'a>,
    is_special_char: impl Fn(char) -> bool,
    is_end_of_literal: impl Fn(char) -> bool,
) -> Result<Option<Cow<'a, str>>, String>