008 obligation escapes via interface

✗ Failing This test is currently failing.

Failed: backend-exec

Failure Output

Showing last 10 of 11 lines
  --> phantom_semantic_check:32:0

❌ Compiler coordination error: Phantom semantic validation failed
error: CompilerCoordinationFailed
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_008_obligation_escapes_via_interface/backend.zig:9487:17: 0x1003a24af in emit (backend)
                return error.CompilerCoordinationFailed;
                ^
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/330_PHANTOM_TYPES/330_008_obligation_escapes_via_interface/backend.zig:9571:28: 0x1003a32b7 in main (backend)
    const generated_code = try RuntimeEmitter.emit(compile_allocator, final_ast);
                           ^

Code

// Test 517: Obligation escapes via interface
// Tests that obligations can escape through return signatures
//
// Key points:
// - my_subflow internally opens a file (via subflow composition)
// - my_subflow returns *File[opened!] in its signature
// - This documents that the obligation escapes
// - The CALLER receives the obligation and must handle it
// - Caller closes the file, satisfying the obligation

~import "$app/fs"

~app.fs:my_subflow()
| file_opened f |> app.fs:close(file: f)
    | closed |> _
input.kz

Expected

Opening file: data.txt
Closing file

Imported Files

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

~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 };
}

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

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

// Subflow that opens a file and returns it with obligation
// The obligation escapes via the return signature - caller must handle it
~pub event my_subflow {}
| file_opened *File[opened!]

// SUBFLOW: Delegates to open, maps opened → file_opened
// The [opened!] obligation passes through to the caller
~my_subflow = open(path: "data.txt")
| opened f |> file_opened { file: f.file }
fs.kz

Test Configuration

MUST_RUN
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