fusible flows

// Test: Pure Koru Flow Fusion
// This test uses pure Koru flows with branch constructors - exactly what fusion is designed for!

const std = @import("std");

// Pure event: add two numbers
~event add { x: i32, y: i32 }
| done { result: i32 }

~proc add = done { result: x + y }

// Pure event: multiply by factor
~event multiply { x: i32, factor: i32 }
| done { result: i32 }

~proc multiply = done { result: x * factor }

// Event that chains pure events - THIS should be fusible!
~event calculate { a: i32, b: i32, c: i32 }
| done { result: i32 }

// Pure Koru flow: add -> multiply
// Fusion should detect this chain and generate calculate|fused variant
~calculate = add(x: a, y: b)
| done sum |> multiply(x: sum.result, factor: c)
| done product |> done { result: product.result }

// Test: Just invoke calculate to prove it compiles and runs
// (We'll verify fusion detection in the frontend output)
pub fn main() void {
    const result = calculate_event.handler(.{ .a = 10, .b = 20, .c = 3 });
    std.debug.print("Result: {}\n", .{result.done.result});
}