macro_rules! Fields {
(@fields()) => { ... };
(@fields(
$label:ident: $dtype:ident $(= $name:expr)*,
$($rest_label:ident: $rest_dtype:ident $(= $rest_name:expr)*,)*)
) => { ... };
($($label:ident: $dtype:ident $(= $name:expr)*),*$(,)*) => { ... };
($existing:ident .. $($label:ident: $dtype:ident),*$(,)*) => { ... };
($($label:ident: $dtype:ident),*$(,)* .. $existing:ident) => { ... };
}
Create a FieldCons cons-list based on a list of provided labels
and data types. Used by tablespace macro.