macro_rules! define_header {
(
$struct_name:ident($header_name:ident = $header_value:literal),
$($const_name:ident => $value:literal),+ $(,)?
) => { ... };
}macro_rules! define_header {
(
$struct_name:ident($header_name:ident = $header_value:literal),
$($const_name:ident => $value:literal),+ $(,)?
) => { ... };
}