Function try_s3_dispatch 

fn try_s3_dispatch(
    generic: &str,
    args: &[RValue],
    named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<Option<RValue>, RError>

Try S3 dispatch for a generic function. Returns Ok(Some(result)) if a method was found and called, Ok(None) if no method exists (caller should fall through to default behavior).