✓
Passing This code compiles and runs correctly.
Code
// PINS (RED, awaiting implementation): a query arm's destructure block is a
// REQUEST, and its entries carry PREFIX ANNOTATIONS naming what the visit
// should synthesize. Here: the row itself, and the 0-based layout cursor a
// retained renderer needs.
//
// RULED 2026-08-03 by Lars, after this pin sat unspellable for a week:
//
// 1. The block is a REQUEST — the transform synthesizes what is asked for,
// and ONLY what is asked for. An unrequested ordinal materializes no
// cursor, the same way an unread aggregate materializes no column.
// 2. Entries are annotated with the language's normal PREFIX form —
// `[comptime]tor`, `[keyword]`, `[global(name)]`. `r[mutable]` is postfix
// only because it hangs off a binding; prefix is the convention.
// 3. LOCAL TO query/store. This is deliberately NOT a language-wide loop
// counter: `for` has the same missing-index hole and does NOT get this.
// The store's query is special because it already drives codegen.
// 4. Honored or REFUSED — never silently ignored. Same law as declared
// reductions ("must refuse to compile, never fall back to serial"). An
// annotation that cannot be satisfied at a site is a diagnostic naming
// the site and the reason, not a decoration.
//
// WHY THE BLOCK IS LEGAL AGAIN, when `690_089` refuses a projection block.
// Three separate things were collapsed under one word, "retired":
//
// - `entity.v` — an UNSCOPED MAGIC TOKEN. Killed because the rewrite matched
// the literal word across a subtree with no scope, so nested sweeps read
// the inner store and wrote the outer one in one arm (690_087). Bindings
// are distinct tokens per nesting level, so this never applied to them.
// - A COLUMN LIST (`{ v, w }`). Killed because "the projection block said the
// same thing twice and let the two halves disagree" (store.kz, at the
// refusal): which columns a site touches is DERIVED from `<row>.<field>`
// references, never listed.
// - The BRACES THEMSELVES. Never had an argument against them. The wall is
// written `if (sc.destructure.len > 0)` — a syntactic ban on brackets
// standing in for an argument about column lists.
//
// This form is untouched by all three: nothing here is a column, so nothing is
// stated twice and the columns stay derived from `e.v` below. Every entry is a
// binding, so nesting stays unambiguous.
//
// NO PARSE AMBIGUITY. A destructure field accepts an identifier, a dotted path,
// or `_` (parser.zig, the PARSE001 site) — there is no bracket production, so a
// LEADING `[` is unclaimed. It cannot collide with `stored { tree[a].parent }`
// handle addressing, where `[` FOLLOWS an identifier and is parsed by the
// store's lvalue grammar. Position tells them apart.
//
// `! query e` stays legal as the shorthand for `! query { [row]e }` — 149
// green sites depend on it and rule 1 of 690_086 still governs the row.
//
// STILL OPEN, deliberately not pinned here: whether the block may ALSO name
// columns. If it may, the two killed arguments above come back with them, so
// this pin keeps columns on `e.v` and lets the block carry only what the VISIT
// knows and the row does not. The vocabulary beyond `[row]`/`[ordinal]`
// (`[id]` for the handle, density and write-intent markers that would let the
// dense-cursor codegen be DECLARED rather than inferred) wants one gating
// principle before it grows — the way fusibility has one.
import std/io
import std/store
std/store:new(items, capacity: 8) { v: i64 }
std/store:insert(items) { v: 10 }
std/store:insert(items) { v: 20 }
std/store:insert(items) { v: 30 }
std/store:query(items)
! query { [row]e, [ordinal]n } |> std/io:print.ln("row {{ n:d }} = {{ e.v:d }}")
Actual
row 0 = 10
row 1 = 20
row 2 = 30
Expected output
✓ Zig✓ C#row 0 = 10
row 1 = 20
row 2 = 30
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 {
// std/store: plural store 'items' created (SoA cell + insert/query/write/take/stripe units); fields v: i64
// >>> FLOW: tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:61 ~input:__store_insert_items()
pub fn flow0() void {
_ = main_module.__store_insert_items_event.handler(.{ .v = 10, .__site_line = 61 });
}
// >>> FLOW: tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:62 ~input:__store_insert_items()
pub fn flow1() void {
_ = main_module.__store_insert_items_event.handler(.{ .v = 20, .__site_line = 62 });
}
// >>> FLOW: tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:63 ~input:__store_insert_items()
pub fn flow2() void {
_ = main_module.__store_insert_items_event.handler(.{ .v = 30, .__site_line = 63 });
}
// >>> FLOW: tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:64 ~input:__store_sweeprun_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6()
pub fn flow3() void {
_ = main_module.__store_sweeprun_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event.handler(.{ });
}
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;
}
const __KoruStoreT_items = struct {
v: [8]i64 = undefined,
len: usize = 0,
};
var __koru_store_items: __KoruStoreT_items = .{};
const __KoruStoreRow_items = struct { v: i64 };
pub const __store_insert_items_event = struct {
pub const Input = struct {
v: i64,
__site_line: i64,
};
pub const Output = void;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.v, __koru_event_input.__site_line);
}
fn __koru_handler_impl(__koru_p_0: i64, __koru_p_1: i64) @This().Output {
const __koru_event_input: @This().Input = .{ .v = __koru_p_0, .__site_line = __koru_p_1 };
// >>> PROC: __store_insert_items [tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:60]
const v = __koru_event_input.v;
const __site_line = __koru_event_input.__site_line;
_ = &v;
_ = &__site_line;
_ = &__koru_event_input;
if (__koru_store_items.len >= 8) @panic("std/store: store 'items' is full (capacity 8) - declared capacity and the `| full` branch are pinned at 690_011");
const __koru_new_row = __koru_store_items.len;
__koru_store_items.v[__koru_new_row] = v;
__koru_store_items.len += 1;
return;
}
};
pub const __store_apply_items_event = struct {
pub const Input = struct {
row: usize,
field: i64,
value_0: i64,
};
pub const Output = union(enum(u8)) {
v: i64,
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: __store_apply_items [tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:60]
const row = __koru_event_input.row;
const field = __koru_event_input.field;
const value_0 = __koru_event_input.value_0;
_ = &row;
_ = &field;
_ = &value_0;
_ = &__koru_event_input;
const __koru_r: usize = row;
return switch (field) {
0 => blk: { __koru_store_items.v[__koru_r] = value_0; break :blk .{ .v = value_0 }; },
else => unreachable,
};
}
};
pub const __store_sweepbody_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event = struct {
pub const Input = struct {
__koru_srf_e_L65_v: i64,
n: i64,
__koru_sdix_e_L65: usize,
};
pub const Output = void;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.__koru_srf_e_L65_v, __koru_event_input.n, __koru_event_input.__koru_sdix_e_L65);
}
fn __koru_handler_impl(__koru_p_0: i64, __koru_p_1: i64, __koru_p_2: usize) @This().Output {
const __koru_event_input: @This().Input = .{ .__koru_srf_e_L65_v = __koru_p_0, .n = __koru_p_1, .__koru_sdix_e_L65 = __koru_p_2 };
// >>> SUBFLOW: tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:64
const __koru_srf_e_L65_v = __koru_event_input.__koru_srf_e_L65_v;
const n = __koru_event_input.n;
const __koru_sdix_e_L65 = __koru_event_input.__koru_sdix_e_L65;
_ = &__koru_srf_e_L65_v;
_ = &n;
_ = &__koru_sdix_e_L65;
_ = &__koru_event_input;
(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("row {d} = {d}\n", .{n, __koru_srf_e_L65_v});
}
};
pub const __store_sweeprun_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event = struct {
pub const Input = struct {
};
pub const Output = void;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: __store_sweeprun_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6 [tests/regression/600_STDLIB/690_STORE/690_069_store_sweep_row_ordinal/input.k:64]
_ = &__koru_event_input;
{
for (0..main_module.__koru_store_items.len) |__koru_si| {
const __koru_srf_e_L65_v = main_module.__koru_store_items.v[__koru_si];
_ = &__koru_srf_e_L65_v;
main_module.__store_sweepbody_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event.handler(.{ .__koru_srf_e_L65_v = __koru_srf_e_L65_v, .n = @as(i64, @intCast(__koru_si)), .__koru_sdix_e_L65 = __koru_si });
}
}
return;
}
};
};
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.flow1();
main_module.flow2();
main_module.flow3();
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();
// std/store: plural store 'items' created (SoA cell + insert/query/write/take/stripe units); fields v: i64
static class __koru_store_items {
public static long[] v = new long[8];
public static long len = 0;
public static long __koru_brand = -1;
}
public static class __store_insert_items_event {
public struct Input {
public long v;
public long __site_line;
}
public static dynamic handler(Input __koru_input) {
var v = __koru_input.v;
var __site_line = __koru_input.__site_line;
if (__koru_store_items.len >= 8) throw new global::System.Exception("std/store: store 'items' is full (capacity 8) - declared capacity and the `| full` branch are pinned at 690_011");
long __koru_new_row = __koru_store_items.len;
__koru_store_items.v[__koru_new_row] = v;
__koru_store_items.len += 1;
return default;
}
}
public static class __store_apply_items_event {
public struct Input {
public long row;
public long field;
public long value_0;
}
public struct Output {
public string tag;
public long v;
}
public static Output handler(Input __koru_input) {
var row = __koru_input.row;
var field = __koru_input.field;
var value_0 = __koru_input.value_0;
var __koru_r = row;
switch (field) {
case 0: { __koru_store_items.v[__koru_r] = value_0; return new Output { tag = "v", v = value_0 }; }
}
throw new global::System.Exception("__store_apply_items: field index " + field + " is not a column of store 'items'");
return default;
}
}
public static class __store_sweepbody_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event {
public struct Input {
public long __koru_srf_e_L65_v;
public long n;
public long __koru_sdix_e_L65;
}
public static dynamic handler(Input __koru_input) {
var __koru_srf_e_L65_v = __koru_input.__koru_srf_e_L65_v;
var n = __koru_input.n;
var __koru_sdix_e_L65 = __koru_input.__koru_sdix_e_L65;
__koru_stdout_write("row " + __koru_str(n) + " = " + __koru_str(__koru_srf_e_L65_v) + "\n");
return default;
}
}
public static class __store_sweeprun_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event {
public struct Input {
}
public static dynamic handler(Input __koru_input) {
{
for (var __koru_si = 0; __koru_si < __koru_store_items.len; __koru_si++) {
var __koru_srf_e_L65_v = __koru_store_items.v[__koru_si];
main_module.__store_sweepbody_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event.handler(new main_module.__store_sweepbody_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event.Input { __koru_srf_e_L65_v = __koru_srf_e_L65_v, n = (long)(__koru_si), __koru_sdix_e_L65 = __koru_si });
}
}
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_p_v = (long)(10);
var __koru_p___site_line = (long)(61);
if (__koru_store_items.len >= 8) throw new global::System.Exception("std/store: store 'items' is full (capacity 8) - declared capacity and the `| full` branch are pinned at 690_011");
long __koru_new_row = __koru_store_items.len;
__koru_store_items.v[__koru_new_row] = __koru_p_v;
__koru_store_items.len += 1;
}
}
public static void flow1() {
{
var __koru_p_v = (long)(20);
var __koru_p___site_line = (long)(62);
if (__koru_store_items.len >= 8) throw new global::System.Exception("std/store: store 'items' is full (capacity 8) - declared capacity and the `| full` branch are pinned at 690_011");
long __koru_new_row = __koru_store_items.len;
__koru_store_items.v[__koru_new_row] = __koru_p_v;
__koru_store_items.len += 1;
}
}
public static void flow2() {
{
var __koru_p_v = (long)(30);
var __koru_p___site_line = (long)(63);
if (__koru_store_items.len >= 8) throw new global::System.Exception("std/store: store 'items' is full (capacity 8) - declared capacity and the `| full` branch are pinned at 690_011");
long __koru_new_row = __koru_store_items.len;
__koru_store_items.v[__koru_new_row] = __koru_p_v;
__koru_store_items.len += 1;
}
}
public static void flow3() {
{
{
for (var __koru_si = 0; __koru_si < __koru_store_items.len; __koru_si++) {
var __koru_srf_e_L65_v = __koru_store_items.v[__koru_si];
main_module.__store_sweepbody_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event.handler(new main_module.__store_sweepbody_items_L65_690_069_store_sweep_row_ordinal_input_5dffb6_event.Input { __koru_srf_e_L65_v = __koru_srf_e_L65_v, n = (long)(__koru_si), __koru_sdix_e_L65 = __koru_si });
}
}
}
}
public static void flow4() {
main_module.koru_start_event.handler(new koru_start_event.Input { });
}
public static void flow5() {
main_module.koru_end_event.handler(new koru_end_event.Input { });
}
}
static class Program {
static void Main() {
main_module.flow4();
main_module.flow0();
main_module.flow1();
main_module.flow2();
main_module.flow3();
main_module.flow5();
}
}
Flows
flow ~new click a branch to expand · @labels scroll to their anchor
new (items, capacity: 8, source: v: i64)
flow ~insert click a branch to expand · @labels scroll to their anchor
insert (items, source: v: 10)
flow ~insert click a branch to expand · @labels scroll to their anchor
insert (items, source: v: 20)
flow ~insert click a branch to expand · @labels scroll to their anchor
insert (items, source: v: 30)
flow ~query click a branch to expand · @labels scroll to their anchor
query (items)
Test Configuration
MUST_RUN LANGUAGES: zig cs