020 label jump obligation

✓ Passing This code compiles and runs correctly.

Code

// TEST: Phantom obligation tracking across label jumps
// STATUS: MUST_FAIL (fixed)
//
// BUG: When a label jump (@loop) occurs, phantom obligations from the
// current scope are not being checked. This allows resource leaks.
//
// EXPECTED: Compiler error - obligation not satisfied before @loop
// ACTUAL: Compiler error (KORU030) once obligations are enforced
//
// This test documents the gap discovered while building Orisha HTTP server.
// The `| failed |> @accept_loop(server: s)` branch leaks the connection.

const std = @import("std");

const Resource = struct { id: i32 };

~event create {}
| created { res: *Resource[open!] }

~proc create {
    const r = std.heap.page_allocator.create(Resource) catch unreachable;
    r.* = .{ .id = 42 };
    return .{ .created = .{ .res = r } };
}

~event use { res: *Resource[open] }
| ok { res: *Resource[open] }
| failed { res: *Resource[open] }

~proc use {
    // Simulate sometimes failing
    if (res.id == 42) {
        return .{ .ok = .{ .res = res } };
    }
    return .{ .failed = .{ .res = res } };
}

~event close { res: *Resource[!open] }
| closed {}

~proc close {
    std.heap.page_allocator.destroy(res);
    return .{ .closed = .{} };
}

// THE BUG: This flow should NOT compile!
// The `| failed |> @loop` branch has an open obligation that is never discharged.
~#loop create()
| created c |> use(res: c.res)
    | ok o |> close(res: o.res)
        | closed |> _
    | failed _f |> @loop()  // BUG! c.res has [open!] obligation, not discharged!

pub fn main() void {
    std.debug.print("Test compiled - BUG: should have been rejected!\n", .{});
}

input.kz

Error Verification

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 (40 items)
[PHASE 2.6] Rescanning transformed AST (40 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]: Label jump '@loop' drops cleanup obligation for 'c.res' - pass it as an argument or discharge it before jumping
  --> phantom_semantic_check:54:0

❌ Compiler coordination error: Phantom semantic validation failed
error: CompilerCoordinationFailed
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/370_PHANTOM_TYPES/370_020_label_jump_obligation/backend.zig:9500:17: 0x100d52433 in emit (backend)
                return error.CompilerCoordinationFailed;
                ^
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/370_PHANTOM_TYPES/370_020_label_jump_obligation/backend.zig:9584:28: 0x100d531bf in main (backend)
    const generated_code = try RuntimeEmitter.emit(compile_allocator, final_ast);
                           ^

Test Configuration

MUST_FAIL

← 010 no function calls in payload 021 label jump scope outer ok →