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 u32
| ?warning []const u8
| ?err []const u8

~proc process|zig {
    if (value == 0) {
        return .{ .err = "Zero value" };
    }
    if (value > 100) {
        return .{ .warning = "Large value" };
    }
    return .{ .success = 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")