✓
Passing This code compiles and runs correctly.
Code
// Pins that a REGISTERED variant wins over the inline splice.
//
// An effect-bearing event whose invocation sits at the top of a flow takes the
// INLINE LOWERING: the proc body is pasted into the caller as a labelled block
// rather than called. That lowering asked `findDefaultZigProc` for the body and
// nothing else, so a variant selected through `std/build:variants` was ignored
// and THE DEFAULT BODY RAN. Nothing failed — the wrong platform's code simply
// executed, and on a target where the default cannot compile it surfaced as a
// libc error naming a call the program does not make.
//
// The two bodies here differ in BOTH observable ways: the effect arm's argument
// and the terminal payload. So the test says which body ran, not merely that
// something ran.
//
// Sibling of 370_011, which pins the same selection through the handler-CALL
// path (its invocation is inside an impl, so it never reached the splice).
~import std/io
~import std/build
const std = @import("std");
~tor pump { n: i32 }
! tick i32
| done string
~proc pump|zig {
tick(n);
return .{ .done = "default" };
}
~proc pump|alt {
tick(n * 2);
return .{ .done = "alt" };
}
~std/build:variants {
"input:pump": "alt"
}
| configured _ |> _
| skipped _ |> _
| invalid-event _ |> _
~tor show { value: i32 }
~proc show|zig {
std.debug.print("{}\n", .{value});
}
~pump(n: 21)
! tick t |> show(value: t)
| done d |> std/io:print.ln(d)
Supporting Files
UnsupportedConstruct
~proc pump|cs {
tick(n);
return new Output { tag = "done", done = "default" };
}
~proc show|cs {
__koru_stdout_write($"{value}\n");
}Actual · Zig
✓ pass42
alt
Actual · C#
✗ UnsupportedConstructExpected output
✓ Zig✗ C#42
alt
Emitted Zig source
// Access compiler flags via the per-user compiler_env module
const CompilerEnv = @import("compiler_env").CompilerEnv;
pub const panic = if (@import("builtin").mode == .Debug)
@import("std").debug.FullPanic(@import("std").debug.defaultPanic)
else
@import("std").debug.simple_panic;
const __koru_bare = struct {
extern fn posix_memalign(memptr: *?*anyopaque, alignment: usize, size: usize) c_int;
extern fn free(ptr: ?*anyopaque) void;
fn bareAlloc(_: *anyopaque, len: usize, alignment: @import("std").mem.Alignment, _: usize) ?[*]u8 {
var p: ?*anyopaque = null;
const a = @max(alignment.toByteUnits(), @sizeOf(usize));
if (posix_memalign(&p, a, len) != 0) return null;
return @ptrCast(p);
}
fn bareResize(_: *anyopaque, _: []u8, _: @import("std").mem.Alignment, _: usize, _: usize) bool { return false; }
fn bareRemap(_: *anyopaque, _: []u8, _: @import("std").mem.Alignment, _: usize, _: usize) ?[*]u8 { return null; }
fn bareFree(_: *anyopaque, memory: []u8, _: @import("std").mem.Alignment, _: usize) void { free(@ptrCast(memory.ptr)); }
const vtable = @import("std").mem.Allocator.VTable{ .alloc = bareAlloc, .resize = bareResize, .remap = bareRemap, .free = bareFree };
const allocator = @import("std").mem.Allocator{ .ptr = undefined, .vtable = &vtable };
};
const __koru_backing = if (@import("builtin").link_libc) @import("std").heap.c_allocator else if (@import("builtin").os.tag == .freestanding) __koru_bare.allocator else @import("std").heap.page_allocator;
var __koru_leak_count: @import("std").atomic.Value(usize) = .init(0);
fn __koru_alloc(ctx: *anyopaque, len: usize, alignment: @import("std").mem.Alignment, ret_addr: usize) ?[*]u8 {
_ = ctx;
const r = __koru_backing.rawAlloc(len, alignment, ret_addr);
if (comptime @import("builtin").mode == .Debug) {
if (r != null) _ = __koru_leak_count.fetchAdd(1, .monotonic);
}
return r;
}
fn __koru_resize(ctx: *anyopaque, memory: []u8, alignment: @import("std").mem.Alignment, new_len: usize, ret_addr: usize) bool {
_ = ctx;
return __koru_backing.rawResize(memory, alignment, new_len, ret_addr);
}
fn __koru_remap(ctx: *anyopaque, memory: []u8, alignment: @import("std").mem.Alignment, new_len: usize, ret_addr: usize) ?[*]u8 {
_ = ctx;
return __koru_backing.rawRemap(memory, alignment, new_len, ret_addr);
}
fn __koru_free(ctx: *anyopaque, memory: []u8, alignment: @import("std").mem.Alignment, ret_addr: usize) void {
_ = ctx;
__koru_backing.rawFree(memory, alignment, ret_addr);
if (comptime @import("builtin").mode == .Debug) {
_ = __koru_leak_count.fetchSub(1, .monotonic);
}
}
const __koru_vtable = @import("std").mem.Allocator.VTable{ .alloc = __koru_alloc, .resize = __koru_resize, .remap = __koru_remap, .free = __koru_free };
pub fn koru_allocator() @import("std").mem.Allocator {
return .{ .ptr = undefined, .vtable = &__koru_vtable };
}
pub inline fn __koru_intcast(comptime T: type, x: anytype) T {
if (comptime (@import("builtin").mode == .Debug or @import("builtin").mode == .ReleaseSafe))
return @as(T, @intCast(x));
const dst = @typeInfo(T);
const src = @typeInfo(@TypeOf(x));
if (comptime (dst == .int and src == .int and dst.int.bits == src.int.bits and dst.int.signedness != src.int.signedness))
return @as(T, @bitCast(x));
return @as(T, @intCast(x));
}
pub fn koru_leak_check() void {
if (comptime @import("builtin").mode != .Debug) return;
if (__koru_leak_count.load(.acquire) == 0) return;
if (comptime @import("builtin").target.os.tag == .freestanding) {
if (comptime @import("builtin").cpu.arch == .wasm32 or @import("builtin").cpu.arch == .wasm64) {
@panic("KORU LEAK CHECK FAILED: the produced program leaked");
} else {
const __klc = struct { extern var stdout: ?*anyopaque; extern fn fputs(__s: [*:0]const u8, __st: ?*anyopaque) c_int; };
var __lb: [128]u8 = undefined;
const __lm = "KORU LEAK CHECK FAILED: allocations still outstanding at end of run: ";
@memcpy(__lb[0..__lm.len], __lm);
var __ln: usize = __lm.len;
var __lv = __koru_leak_count.load(.acquire);
var __ld: [20]u8 = undefined;
var __lk: usize = 0;
while (__lv > 0) : (__lk += 1) { __ld[__lk] = @intCast('0' + __lv % 10); __lv /= 10; }
for (0..__lk) |__li| { __lb[__ln] = __ld[__lk - 1 - __li]; __ln += 1; }
__lb[__ln] = '\n'; __ln += 1; __lb[__ln] = 0;
_ = __klc.fputs(@as([*:0]const u8, @ptrCast(&__lb)), __klc.stdout);
@trap();
}
} else {
@import("std").debug.print("KORU LEAK CHECK FAILED: the produced program leaked (trace above)\n", .{});
@import("std").process.exit(1);
}
}
pub const main_module = struct {
const std = @import("std");
pub const pump_event = struct {
pub const Input = struct {
n: i32,
};
pub const Output = union(enum(u8)) {
done: []const u8,
};
pub fn handler(__koru_event_input: @This().Input, comptime __H: type) @This().Output {
const tick = __H.tick;
_ = &tick;
// >>> PROC: pump [tests/regression/300_ADVANCED_FEATURES/370_VARIANTS/370_012_registered_variant_beats_the_inline_splice/input.kz:33]
const n = __koru_event_input.n;
_ = &n;
_ = &__koru_event_input;
tick(n * 2);
return .{ .done = "alt" };
}
pub fn handler__alt(__koru_event_input: @This().Input, comptime __H: type) @This().Output { // |alt
const n = __koru_event_input.n;
const tick = __H.tick;
_ = &tick;
_ = &n;
_ = &__koru_event_input;
tick(n * 2);
return .{ .done = "alt" };
}
};
pub const show_event = struct {
pub const Input = struct {
value: i32,
};
pub const Output = void;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.value);
}
fn __koru_handler_impl(__koru_p_0: i32) @This().Output {
const __koru_event_input: @This().Input = .{ .value = __koru_p_0 };
// >>> PROC: show [tests/regression/300_ADVANCED_FEATURES/370_VARIANTS/370_012_registered_variant_beats_the_inline_splice/input.kz:47]
const value = __koru_event_input.value;
_ = &value;
_ = &__koru_event_input;
std.debug.print("{}\n", .{value});
}
};
// >>> FLOW: tests/regression/300_ADVANCED_FEATURES/370_VARIANTS/370_012_registered_variant_beats_the_inline_splice/input.kz:51 ~input:pump()
pub fn flow0() void {
const Handlers_0 = struct {
fn tick(t: i32) void {
_ = &t;
{
_ = main_module.show_event.handler(.{ .value = t });
}
}
};
const result_0 = main_module.pump_event.handler__alt(.{ .n = 21 }, Handlers_0); // |alt
const d = result_0.done;
(struct { fn __kout(__fd: i32, __b: []const u8) void { if (@import("builtin").os.tag == .freestanding) { const __kc = struct { extern var stdout: ?*anyopaque; extern var stderr: ?*anyopaque; extern fn fputs(__s: [*:0]const u8, __st: ?*anyopaque) c_int; }; var __kt: [4096]u8 = undefined; for (0..(__b.len + __kt.len - 2) / (__kt.len - 1)) |__ki| { const __kn = @min(__kt.len - 1, __b.len - __ki * (__kt.len - 1)); @memcpy(__kt[0..__kn], __b[__ki * (__kt.len - 1)..][0..__kn]); __kt[__kn] = 0; @import("std").mem.doNotOptimizeAway(__kc.fputs(@as([*:0]const u8, @ptrCast(&__kt)), if (__fd == 2) __kc.stderr else __kc.stdout)); } } else { @import("std").mem.doNotOptimizeAway(@import("std").posix.write(__fd, __b) catch @as(usize, 0)); } } fn __kw(comptime __f: []const u8, __a: anytype) void { var __kb: [65536]u8 = undefined; const __ks = @import("std").fmt.bufPrint(&__kb, __f, __a) catch __kb[0..0]; __kout(1, __ks); } }).__kw("{s}\n", .{d});
}
pub fn koru_start_flow() void {
const result_0 = koru_koru.start_event.handler(.{ });
const result_0_done = result_0.done;
_ = &result_0_done;
}
pub fn koru_end_flow() void {
const result_0 = koru_koru.end_event.handler(.{ });
const result_0_done = result_0.done;
_ = &result_0_done;
}
};
pub const koru_koru = struct {
pub const start_event = struct {
pub const Input = struct {
};
pub const Output = union(enum(u8)) {
done: struct {
},
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
_ = &__koru_event_input;
return .{ .done = .{} };
}
};
pub const end_event = struct {
pub const Input = struct {
};
pub const Output = union(enum(u8)) {
done: struct {
},
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
_ = &__koru_event_input;
return .{ .done = .{} };
}
};
};
pub fn main() void {
main_module.koru_start_flow();
main_module.flow0();
main_module.koru_end_flow();
if (comptime @import("builtin").mode == .Debug) koru_leak_check();
}
test {
@import("std").testing.refAllDeclsRecursive(@This());
}
Emitted C# source
static class main_module {
public static void __koru_stdout_write(dynamic s) => global::System.Console.Out.Write(s);
public static void __koru_stderr_write(dynamic s) => global::System.Console.Error.Write(s);
// The mutable handle carrier — `*String`-style resources are
// `new __KoruBox { data = … }` because C# anonymous types are
// read-only: `s.data = …` (std/string append/clear, handle
// mutation generally) needs a settable member.
public class __KoruBox { public dynamic data; }
// Textification for `{{ … }}` operands: C# bool ToStrings as
// `True` where Koru prints `true`, and the operand's static type
// is unknown at this boundary — a `(x) is bool` inline test would
// be a compile error on statically-typed operands instead. Generic
// on purpose: `dynamic` boxed every value-type operand — measured
// ~1s/10M elements on 012_threat_scanner — while T specializes to
// the operand's own ToString() with no box.
public static string __koru_str<T>(T v) => v is bool b ? (b ? "true" : "false") : v?.ToString();
public static class pump_event {
public struct Input {
public int n;
}
public struct Output {
public string tag;
public string done;
}
public interface IOps {
void tick(int __koru_arg);
}
public static Output handler<H>(Input __koru_input, H ops) where H : struct, IOps {
void tick(int __koru_arg) => ops.tick(__koru_arg);
var n = __koru_input.n;
tick(n);
return new Output { tag = "done", done = "default" };
return default;
}
}
public static class show_event {
public struct Input {
public int value;
}
public static dynamic handler(Input __koru_input) {
var value = __koru_input.value;
__koru_stdout_write($"{value}\n");
return default;
}
}
public static class koru_start_event {
public struct Input {
}
public struct Output {
public string tag;
public dynamic done;
}
public static Output handler(Input __koru_input) => new Output { tag = "done" };
}
public static class koru_end_event {
public struct Input {
}
public struct Output {
public string tag;
public dynamic done;
}
public static Output handler(Input __koru_input) => new Output { tag = "done" };
}
public static void flow0() {
var __koru_handlers_0 = new __koru_handlers_0 { __koru_fn_tick = (__koru_arm_1) => {
var t = __koru_arm_1;
{
var __koru_p_value = (int)(t);
__koru_stdout_write($"{__koru_p_value}\n");
}
return null;
}, };
var result_2 = main_module.pump_event.handler(new pump_event.Input { n = (int)(21)}, __koru_handlers_0);
var d = result_2.done;
__koru_stdout_write("" + (d) + "\n");
}
public static void flow1() {
main_module.koru_start_event.handler(new koru_start_event.Input { });
}
public static void flow2() {
main_module.koru_end_event.handler(new koru_end_event.Input { });
}
struct __koru_handlers_0 : pump_event.IOps {
public global::System.Func<dynamic, dynamic> __koru_fn_tick;
public void tick(int __koru_arm_1) => __koru_fn_tick(__koru_arm_1);
}
}
static class Program {
static void Main() {
main_module.flow1();
main_module.flow0();
main_module.flow2();
}
}
Flows
flow ~variants click a branch to expand · @labels scroll to their anchor
variants (source: "input:pump": "alt")
flow ~pump click a branch to expand · @labels scroll to their anchor
pump (n: 21)
Test Configuration
MUST_RUN LANGUAGES: zig cs