empty payload branches

// Test: Multiple branches with BOTH having empty payloads
// This tests switch emission for empty union variants
// Previously: emitter would generate |name| capture even for empty payloads
// Fixed: emitter now generates => { without capture for empty payloads

~import "$std/io"

// Event with two branches, BOTH empty (no payload fields)
~event check_value { n: i32 }
| positive {}
| non_positive {}

~proc check_value {
    if (n > 0) {
        return .{ .positive = .{} };
    } else {
        return .{ .non_positive = .{} };
    }
}

// Test: handle both empty branches
~check_value(n: 42)
    | positive |> std.io:println(text: "42 is positive")
    | non_positive |> std.io:println(text: "42 is not positive")

~check_value(n: -5)
    | positive |> std.io:println(text: "-5 is positive")
    | non_positive |> std.io:println(text: "-5 is not positive")

~check_value(n: 0)
    | positive |> std.io:println(text: "0 is positive")
    | non_positive |> std.io:println(text: "0 is not positive")