016 optional branches ignored

// ============================================================================
// Test 065: Optional Branches Are Truly Optional
// Tests that optional branches can be COMPLETELY IGNORED (no |? catch-all needed)
// This is the killer feature - they're truly optional!
// ============================================================================

const std = @import("std");

// Event with required and optional branches
// success: REQUIRED - must be handled
// warning, debug: OPTIONAL - can be ignored!
~event process { value: u32 }
| success u32
| ?warning []const u8
| ?debug []const u8

// Proc that can return any branch
~proc process|zig {
    if (value > 100) {
        return .{ .warning = @as([]const u8, "Large value") };
    }
    if (value % 2 == 1) {
        return .{ .debug = @as([]const u8, "Odd value") };
    }
    std.debug.print("Success: {}\n", .{value * 2});
    return .{ .success = value * 2 };
}

// Flow that ONLY handles required branch - optional branches are ignored!
// This should compile and run - warning/debug branches are silently ignored
~process(value: 10)
| success _ |> _
// NO |? catch-all needed!
// NO | warning w |> needed!
// NO | debug d |> needed!
// They're truly optional - silent no-op if they fire!