017 scope label loop

○ Planned This feature is planned but not yet implemented.

Auto-dispose for obligations in @loop branches not implemented

Failure Output

error[KORU100]: unused binding 'f'
  --> tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_017_scope_label_loop/input.kz:33:4
    |
 33 |     | opened f |> @loop(count: n.count)  // Auto-close f before @loop
    |    ^
  hint: remove the binding if not needed

Code

~import app/fs
const std = @import("std");
~event iterate { count: i32 }
| next i32
~proc iterate|zig {
    if (count < 3) {
        return .{ .next = count + 1 };
    } else {
    }
}
~#loop iterate(count: 0)
| next n |> app/fs:open(path: "test.txt")
    | opened f |> @loop(n.count)  // Auto-close f before @loop
|> _

input.kz

Expected output

Opening file
Closing file
Opening file
Closing file
Opening file
Closing file

Imported Files

// Library module: fs
// Single disposal event

const std = @import("std");

const File = struct { handle: i32 };

// Open a file - returns opened! state (requires cleanup)
~pub event open { path: []const u8 }
| opened *File<opened!>

~proc open|zig {
    std.debug.print("Opening file\n", .{});
    const f = std.heap.page_allocator.create(File) catch unreachable;
    f.* = File{ .handle = 42 };
    return .{ .opened = f };
}

// Close - the ONLY consumer of [!opened]
~pub event close { file: *File<!opened> }

~proc close|zig {
    std.debug.print("Closing file\n", .{});
}

fs.kz

Test Configuration

MUST_RUN

← 016 scope nested 018 auto discharge escaped obligation →