005 all optional

// Test 918e: Optional Branches - All Branches Optional (Edge Case)
//
// Verifies:
// 1. Event with NO required branches — all optional
// 2. Handler uses ONLY |? to catch everything
// 3. Edge case: zero required branches + only catch-all

~import "$std/io"

// Event with ONLY optional branches
~event process { value: u32 }
| ?success { result: u32 }
| ?warning { msg: []const u8 }
| ?err { msg: []const u8 }

~proc process {
    if (value == 0) {
        return .{ .err = .{ .msg = "Zero value" } };
    }
    if (value > 100) {
        return .{ .warning = .{ .msg = "Large value" } };
    }
    return .{ .success = .{ .result = value * 2 } };
}

// All caught by |?
~process(value: 10)
|? |> std.io:print.ln("OPTIONAL FIRED")

~process(value: 150)
|? |> std.io:print.ln("OPTIONAL FIRED")

~process(value: 0)
|? |> std.io:print.ln("OPTIONAL FIRED")