007 use after disposal

✓ Passing This code compiles and runs correctly.

Code

// Test 516: Use-after-disposal error
// Tests that using a resource after disposal is caught
//
// Key points:
// - open() returns *File[opened!]
// - close() accepts *File[!opened] and marks it as disposed
// - use_file() expects *File[opened]
// - ERROR: Cannot use f.file after it was disposed by close()

~import "$app/fs"

~app.fs:open(path: "test.txt")
| opened f |> app.fs:close(file: f.file)
    | closed |> app.fs:use_file(file: f.file)  // ERROR: f.file was disposed!
        | used |> _
input.kz

Error Verification

Expected Error Pattern

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

Actual Compiler Output 

[PHASE 2.4] Calling run_pass for transforms\n[PHASE 2.5] Executing comptime_main() - running comptime flows
[PHASE 2.5] Comptime flows complete (25 items)
[PHASE 2.6] Rescanning transformed AST (25 items)
[PHASE 2.6] Rescan complete: 25 comptime events found
  [0] std.compiler:requires
  [1] std.compiler:flag.declare
  [2] std.compiler:command.declare
  [3] std.compiler:coordinate
  [4] std.compiler:context_create
  [5] std.testing:test
  [6] std.testing:validate_mocks
  [7] std.testing:test.with_harness
  [8] std.testing:test.harness
  [9] std.testing:assert
  [10] std.testing:test.property.equivalent
  [11] std.deps:deps
  [12] std.deps:requires.system
  [13] std.deps:requires.zig
  [14] std.control:if
  [15] std.control:for
  [16] std.control:capture
  [17] std.control:const
  [18] std.build:requires
  [19] std.build:variants
  [20] std.build:config
  [21] std.build:command.sh
  [22] std.build:command.zig
  [23] std.build:step
  [24] std.template:define

[PHANTOM-KORU] Starting phantom check proc...
error[KORU030]: Use-after-disposal: binding 'f.file' was already disposed and cannot be used
  --> phantom_semantic_check:13:0

❌ Compiler coordination error: Phantom semantic validation failed
error: CompilerCoordinationFailed
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_007_use_after_disposal/backend.zig:9470:17: 0x10240e433 in emit (backend)
                return error.CompilerCoordinationFailed;
                ^
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_007_use_after_disposal/backend.zig:9554:28: 0x10240f1bf in main (backend)
    const generated_code = try RuntimeEmitter.emit(compile_allocator, final_ast);
                           ^

Imported Files

const std = @import("std");
const File = struct { handle: i32 };

~pub event open { path: []const u8 }
| opened { file: *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 = .{ .file = f } };
}

~pub event close { file: *File[!opened] }  // Consumes obligation
| closed {}

~proc close {
    std.debug.print("Closing file\n", .{});
    return .{ .closed = .{} };
}

~pub event use_file { file: *File[opened] }  // Expects opened file
| used {}

~proc use_file {
    std.debug.print("Using file\n", .{});
    return .{ .used = .{} };
}
fs.kz

Test Configuration

MUST_FAIL
← 006 cleanup consumed by disposal 008 obligation escapes via interface →