label scope errors

// ============================================================================
// VERIFIED REGRESSION TEST - DO NOT MODIFY WITHOUT DISCUSSION
// ============================================================================
// Test 206: Label scope errors
// Tests that labels are flow-scoped and cannot be accessed across flows
// Expected to fail compilation with "Unknown label 'loop'" error
// ============================================================================

const std = @import("std");

// Simple counter event
~event counter { n: i32 }
| next i32
| done i32

~proc counter|zig {
    std.debug.print("Count: {}\n", .{n});

    if (n < 3) {
        return .{ .next = n + 1 };
    } else {
        return .{ .done = n };
    }
}

// Start event
~event start {}

~proc start|zig {
    std.debug.print("Starting...\n", .{});
}

// Flow 1 with a label
~start() |> #loop counter(n: 1)
| next c |> @loop(n: c.value)
| done |> _

// Flow 2 trying to jump to Flow 1's label (should error!)
~start() |> @loop(n: 1)  // ERROR: 'loop' is not in scope here