007 use after disposal

✓ Passing This code compiles and runs correctly.

Code

~import app/fs
~app/fs:open(path: "test.txt")
| opened f |> app/fs:close(file: f) |> app/fs:use-file(file: f)  // ERROR: f was disposed!

input.kz

Must contain:

Use-after-discharge

Error Verification

Expected Error Pattern

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

Actual Compiler Output

error[KORU030]: Use-after-discharge: binding 'f' was already discharged and cannot be used
  --> phantom_semantic_check:3:0

❌ 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:94:13: 0x100fb338b 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:190:28: 0x100fb4077 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<opened!>

~proc open|zig {
    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 };
}

~pub event close { file: *File<!opened> }  // Consumes obligation

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

~pub event use-file { file: *File<opened> }  // Expects opened file

~proc use-file|zig {
    std.debug.print("Using file\n", .{});
}

fs.kz

Test Configuration

MUST_FAIL

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