005 impure event error

✓ Passing Passing: the compiler rejects this program as expected.

Code

// Test: Impure events require overrides
// MUST_ERROR: has impure events without overrides
//
// When a test calls an impure event (Zig proc without [pure]),
// the compiler should error and list ALL impure events at once.
//
// This is the "fix/recompile loop killer" - great UX!

~import std/testing

// Impure event - Zig proc without [pure]
~tor fetch-user { id: u32 } -> string

~proc fetch-user|zig {
    // This is impure - does I/O (simulated)
    return "Alice";
}

// Another impure event
~tor save-log { message: string }

~proc save-log|zig {
    // This is impure - writes to disk
}

// Test: Should FAIL - calls impure events without overrides
~test(Impure events should error) {
    ~fetch-user(id: 1): u |> save-log(message: u.name)
        | saved |> assert.ok()
}

input.kz

Actual compiler output

[TEST] Building mock lookup map
[TEST] Transformed program has 15 items:
[TEST]   [0] flow
[TEST]       invocation: fetch-user
[TEST]   [1] other
[TEST]   [2] other
[TEST]   [3] other
[TEST]   [4] other
[TEST]   [5] other
[TEST]   [6] other
[TEST]   [7] other
[TEST]   [8] other
[TEST]   [9] event_decl
[TEST]   [10] proc_decl
[TEST]   [11] other
[TEST]   [12] event_decl
[TEST]   [13] proc_decl
[TEST]   [14] other
[TEST] Found 1 transformed flows
[TEST] Purity walk complete, 2 impure events
thread 120867107 panic: Test 'Impure events should error' has impure events without mocks: fetch-user, save-log
???:?:?: 0x102497633 in _backend_output_emitted.koru_std.koru_testing.test_event.handler (???)
???:?:?: 0x102251ee7 in _backend_output_emitted.call_handler_testing_test (???)
???:?:?: 0x1024a23d7 in _transform_pass_runner.applyTransform (???)
???:?:?: 0x10225031b in _transform_pass_runner.walkNode (???)
???:?:?: 0x10224fe07 in _transform_pass_runner.walkNode (???)
???:?:?: 0x10224fe07 in _transform_pass_runner.walkNode (???)
???:?:?: 0x10224fe07 in _transform_pass_runner.walkNode (???)
???:?:?: 0x10224fe07 in _transform_pass_runner.walkNode (???)
???:?:?: 0x10224fe07 in _transform_pass_runner.walkNode (???)
???:?:?: 0x10224f9a7 in _transform_pass_runner.walkOnce (???)
???:?:?: 0x10225135b in _transform_pass_runner.walkAndTransformStages (???)
???:?:?: 0x1022516d7 in _backend_output_emitted.run_pass (???)
???:?:?: 0x1022400cb in _backend_output_emitted.koru_std.koru_compiler.evaluate_comptime_event.handler (???)
???:?:?: 0x10223b9fb in _backend_output_emitted.koru_std.koru_compiler.elaborate_event.handler (???)
???:?:?: 0x10223af5b in _backend_output_emitted.koru_std.koru_compiler.coordinate_event.handler (???)
???:?:?: 0x10223ad9b in _koru_coordinate (???)
???:?:?: 0x1021bd3fb in _backend.RuntimeEmitter.emit (???)
???:?:?: 0x1021beebb in _backend.main (???)
???:?:?: 0x1021c6f97 in _main (???)
???:?:?: 0x1816a3dff in ??? (???)
???:?:?: 0x0 in ??? (???)
/Users/larsde/src/koru/scripts/regression_lib.sh: line 397: 37166 Abort trap: 6           ./backend output

Error output must contain

Test 'Impure events should error' has impure events without mocks: fetch-user, save-log

Flows

flow ~test click a branch to expand · @labels scroll to their anchor

test (Impure events should error, source: ~fetch-user(id: 1): u |> save-log(message: u.name) | saved |> assert.ok())

Test Configuration

MUST_ERROR COMPILE_ONLY

← 004 constant event auto inline 006 impure event fixed →