Macro assets 

macro_rules! assets {
    ($( ($script_hash:literal, $asset_name:literal, $amount:expr $(,)?) ),+ $(,)? ) => { ... };
    ($( ($script_hash:literal, $asset_name:literal, $amount:expr, $redeemer:expr $(,)?) ),+ $(,)? ) => { ... };
}

Construct a multi-asset object; akin to a Value<u64> but without lovelace.

The second variant of this macro takes an extra PlutusData redeemer. This is handy to create mint assets, which always come with a redeemer.

See also:

• value!
• Transaction::with_mint