003 ignored no catchall

// Test 918c: Optional Branches - Ignored Without |? Catch-All
//
// Verifies:
// 1. Optional branches can be COMPLETELY IGNORED
// 2. No |? catch-all needed for optional branches
// 3. Only required branches need handlers

~import "$std/io"

// Event with required + multiple optional branches
~event analyze { value: u32 }
| success { result: u32 }         // REQUIRED
| ?warning { msg: []const u8 }    // OPTIONAL: ignored
| ?debug { info: []const u8 }     // OPTIONAL: ignored

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

// value=50 → success
~analyze(value: 50)
| success _ |> std.io:print.ln("SUCCESS")
// No warning handler, no |? — optional branches just ignored

// value=150 → warning (optional, no handler — silently ignored)
~analyze(value: 150)
| success _ |> std.io:print.ln("SUCCESS")