004 struct in flow

// Test: Struct declared via ~struct used as event parameter type
//
// This is the real payoff: declare a type through Koru,
// then use it in event signatures and flows.

~import "$std/types"
~import "$std/io"

// Declare the type through Koru
~struct(Player) {
    name: []const u8,
    health: i32,
}

// Use it in an event signature
~event greet { player: Player }
| greeted []const u8

~proc greet {
    return .{ .greeted = player.name };
}

// Use it in a flow
const p = Player{ .name = "Alice", .health = 100 };

~greet(player: p)
| greeted msg |>
    print.ln("Hello, {{ msg:s }}!")