✓
Passing This code compiles and runs correctly.
Code
import std/io
// Pins that a module can declare a 6-field bare-expression bool tor.
//
// Regression 2026-08-20, found by koru-libs/asteroids (sim:collide): adding
// a 6-field tor with a bare `<=` bool body to an imported module panicked
// the tap transformer (index-out-of-bounds in transformItems) instead of
// compiling. 4-field tors and record-return tors are fine; the 6-field
// bare-expr bool shape is the trigger.
std/compiler:paths {
sim: {{ ENTRY }}/test_lib/sim
}
import sim
sim:collide(ax: 0.0, ay: 0.0, ar: 10.0, bx: 18.0, by: 0.0, br: 10.0): hit
|> std/io:print.ln("{{ hit:any }}")
Supporting Files
pub tor collide { ax: f32, ay: f32, ar: f32, bx: f32, by: f32, br: f32 } -> bool
collide -> (ax - bx) * (ax - bx) + (ay - by) * (ay - by) <= (ar + br) * (ar + br)
Actual
true
Expected output
✓ Zig✓ C#true
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 and !@import("builtin").cpu.arch.isWasm()) __koru_bare.allocator else @import("std").heap.page_allocator;
var __koru_leak_count: @import("std").atomic.Value(usize) = .init(0);
var __koru_par_tasks: @import("std").atomic.Value(usize) = .init(0);
const __koru_par_CAP: usize = 128;
threadlocal var __koru_par_depth: usize = 0;
const __koru_par_DEPTH_CAP: usize = 7;
var __koru_par_pool: @import("std").Thread.Pool = undefined;
var __koru_par_pool_ready: bool = false;
var __koru_par_pool_mtx: @import("std").Thread.Mutex = .{};
fn __koru_par_pool_ensure() *@import("std").Thread.Pool {
__koru_par_pool_mtx.lock();
defer __koru_par_pool_mtx.unlock();
if (!__koru_par_pool_ready) {
@import("std").Thread.Pool.init(&__koru_par_pool, .{ .allocator = @import("std").heap.smp_allocator }) catch @panic("koru: thread pool init failed");
__koru_par_pool_ready = true;
}
return &__koru_par_pool;
}
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));
}
fn __KoruPadI(comptime T: type) type {
const V = switch (@typeInfo(T)) { .comptime_int => i64, .comptime_float => f64, else => T };
return struct {
v: V,
width: usize,
pub fn format(self: @This(), w: *@import("std").Io.Writer) @import("std").Io.Writer.Error!void {
const rendered = @import("std").fmt.count("{d}", .{self.v});
const pad = self.width -| rendered;
for (0..pad) |_| try w.writeByte(' ');
try w.print("{d}", .{self.v});
}
};
}
pub fn __koru_pad_i(width: usize, value: anytype) __KoruPadI(@TypeOf(value)) {
return .{ .v = value, .width = width };
}
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 {
// >>> FLOW: tests/regression/100_MODULE_SYSTEM/110_IMPORTS/110_032_module_bare_expr_6_field_tor/input.k:17 ~sim:collide()
pub fn flow0() void {
const hit = koru_sim.collide_event.handler(.{ .ax = 0.0, .ay = 0.0, .ar = 10.0, .bx = 18.0, .by = 0.0, .br = 10.0 });
(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("{any}\n", .{hit});
}
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_sim = struct {
pub const collide_event = struct {
pub const Input = struct {
ax: f32,
ay: f32,
ar: f32,
bx: f32,
by: f32,
br: f32,
};
pub const Output = bool;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.ax, __koru_event_input.ay, __koru_event_input.ar, __koru_event_input.bx, __koru_event_input.by, __koru_event_input.br);
}
fn __koru_handler_impl(__koru_p_0: f32, __koru_p_1: f32, __koru_p_2: f32, __koru_p_3: f32, __koru_p_4: f32, __koru_p_5: f32) @This().Output {
const __koru_event_input: @This().Input = .{ .ax = __koru_p_0, .ay = __koru_p_1, .ar = __koru_p_2, .bx = __koru_p_3, .by = __koru_p_4, .br = __koru_p_5 };
const ax = __koru_event_input.ax;
const ay = __koru_event_input.ay;
const ar = __koru_event_input.ar;
const bx = __koru_event_input.bx;
const by = __koru_event_input.by;
const br = __koru_event_input.br;
_ = &ax;
_ = &ay;
_ = &ar;
_ = &bx;
_ = &by;
_ = &br;
return (ax - bx) * (ax - bx) + (ay - by) * (ay - by) <= (ar + br) * (ar + br);
}
};
};
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(object s) => global::System.Console.Out.Write(s);
public static void __koru_stderr_write(object 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. `object`, not
// `dynamic`: the field is storage — every `x.data` read reaches
// it through a dynamic-typed handle (`*T` Input fields, the
// `dynamic` borrow locals below), so the member itself only
// needs to hold the value, and `object` keeps the DLR out of
// the store/load path.
public class __KoruBox { public object 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 sim_collide_event {
public struct Input {
public float ax;
public float ay;
public float ar;
public float bx;
public float by;
public float br;
}
public static bool handler(Input __koru_input) {
var ax = __koru_input.ax;
var ay = __koru_input.ay;
var ar = __koru_input.ar;
var bx = __koru_input.bx;
var by = __koru_input.by;
var br = __koru_input.br;
return (bool)((ax - bx) * (ax - bx) + (ay - by) * (ay - by) <= (ar + br) * (ar + br));
}
}
public static class koru_start_event {
public struct Input {
}
public struct Output {
public string tag;
public object 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 object done;
}
public static Output handler(Input __koru_input) => new Output { tag = "done" };
}
public static void flow0() {
var hit = main_module.sim_collide_event.handler(new sim_collide_event.Input { ax = (float)(0.0), ay = (float)(0.0), ar = (float)(10.0), bx = (float)(18.0), by = (float)(0.0), br = (float)(10.0)});
__koru_stdout_write("" + __koru_str(hit) + "\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 { });
}
}
static class Program {
static void Main() {
main_module.flow1();
main_module.flow0();
main_module.flow2();
}
}
Flows
flow ~paths click a branch to expand · @labels scroll to their anchor
paths (source: sim: {{ ENTRY }}/test_lib/sim)
flow ~collide click a branch to expand · @labels scroll to their anchor
collide (ax: 0.0, ay: 0.0, ar: 10.0, bx: 18.0, by: 0.0, br: 10.0)
Test Configuration
MUST_RUN LANGUAGES: zig cs