Macro tpm_struct 

macro_rules! tpm_struct {
    (
        $(#[$meta:meta])*
        kind: Command,
        name: $name:ident,
        cc: $cc:expr,
        handles: {
            $($handle_field:ident),*
            $(,)?
        },
        parameters: {
            $(pub $param_field:ident: $param_type:ty),*
            $(,)?
        }
    ) => { ... };
    (
        $(#[$meta:meta])*
        kind: Response,
        name: $name:ident,
        cc: $cc:expr,
        handles: {
            $($handle_field:ident),*
            $(,)?
        },
        parameters: {
            $(pub $param_field:ident: $param_type:ty),*
            $(,)?
        }
    ) => { ... };
    (
        $(#[$meta:meta])*
        $vis:vis struct $name:ident {
            $(pub $field_name:ident: $field_type:ty),*
            $(,)?
        }
    ) => { ... };
}