all optional

// Test 918e: Optional Branches - All Branches Optional with |? (EDGE CASE)
//
// This test demonstrates:
// 1. Event with NO required branches - all optional
// 2. Handler uses ONLY |? to catch everything
// 3. Verifies edge case: zero required branches + only catch-all handler
// 4. Tests that system doesn't break when everything is optional

const std = @import("std");

// Event with ONLY optional branches - no required ones!
// This is an edge case but should be valid
~event process { value: u32 }
| ?success { result: u32 }        // OPTIONAL
| ?warning { msg: []const u8 }    // OPTIONAL
| ?error { msg: []const u8 }      // OPTIONAL

~proc process {
    // Return different branches based on value
    if (value == 0) {
        return .{ .error = .{ .msg = "Zero value" } };
    }

    if (value > 100) {
        return .{ .warning = .{ .msg = "Large value" } };
    }

    const doubled = value * 2;
    return .{ .success = .{ .result = doubled } };
}

// Handler with ONLY |? - no explicit branch handling
// This is valid because ALL branches are optional (zero required)
// Edge case: Can a handler have ONLY |? with no explicit branches?
~process(value: 10)
|? |> std.debug.print("Optional branch fired\n", .{})

~process(value: 150)
|? |> std.debug.print("Optional branch fired\n", .{})

~process(value: 0)
|? |> std.debug.print("Optional branch fired\n", .{})