Function selectors::parser::parse_qualified_name

fn parse_qualified_name<'i, 't, P, Impl>(
    parser: &P,
    input: &mut Parser<'i, 't>,
    in_attr_selector: bool
) -> Result<OptionalQName<'i, Impl>, ParseError<'i, P::Error>>where
    P: Parser<'i, Impl = Impl>,
    Impl: SelectorImpl,

• Err(()): Invalid selector, abort
• Ok(None(token)): Not a simple selector, could be something else. input was not consumed, but the token is still returned.
• Ok(Some(namespace, local_name)): None for the local name means a * universal selector