004 cleanup obligation escape

✓ Passing This code compiles and runs correctly.

Code

~import "$std/io"
~import "$app/fs"
~app.fs:open(path: "test.txt")
| opened |> _  // ERROR: Flow ends with *File[opened!] not cleaned up!
input.kz

Error Verification

Expected Error Pattern

Backend should fail - no disposal event available or multiple disposal options

Actual Compiler Output 

error[KORU030]: branch 'opened' has payload but no binding
  --> tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_004_cleanup_obligation_escape/input.kz:4:0

❌ Compiler coordination error: Incomplete branch coverage
error: CompilerCoordinationFailed
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_004_cleanup_obligation_escape/backend.zig:11336:17: 0x100bc24af in emit (backend)
                return error.CompilerCoordinationFailed;
                ^
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_004_cleanup_obligation_escape/backend.zig:11420:28: 0x100bc32b7 in main (backend)
    const generated_code = try RuntimeEmitter.emit(compile_allocator, final_ast);
                           ^

Imported Files

// Library module: fs
// Defines filesystem operations with cleanup obligations

const std = @import("std");

// File type with phantom states
const File = struct {
    handle: i32,
};

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

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

// Close a file - accepts opened state, returns closed state
~pub event close { file: *File[!opened] }

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

Test Configuration

MUST_FAIL
← 003 unknown phantom module 005 cleanup obligation satisfied →