[ CCode ( type_id = "dex_block_get_type ()" ) ]
public sealed class Block : Future
`DexBlock` represents a callback closure that can be scheduled to run within a specific [struct@GLib.
MainContext].
You create these by chaining futures together using [ctor@Dex.Future.then], [ctor@Dex.Future.catch], [ctor@Dex.Future.finally] and similar.