✓
Passing This code compiles and runs correctly.
Code
// Pins: `==` and `!=` on runtime strings in an `if` condition, on BOTH
// targets. Koru's `==` on strings is VALUE equality — the comptime fold
// (comptime_eval.zig), the interpreter, and the JS target already agreed;
// this pins the Zig emission (`@import("std").mem.eql`) into the same
// meaning. The shape is 320_128's if-produce with a string param — the
// command-dispatch idiom (route a runtime word, not a numeric code).
import std/io
pub tor route { cmd: string } -> string
route = if(cmd == "start")
| then -> "starting"
| else -> "unknown"
pub tor gate { word: string } -> i64
gate = if(word != "secret" and word != "admin")
| then -> 0
| else -> 1
route(cmd: "start"): r |> std/io:print.ln(r)
route(cmd: "stop"): r2 |> std/io:print.ln(r2)
gate(word: "guest"): a |> std/io:print.ln("{{ a:d }}")
gate(word: "secret"): b |> std/io:print.ln("{{ b:d }}")
Actual
starting
unknown
0
1
Expected output
✓ Zig✓ JavaScript✓ C#starting
unknown
0
1
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);
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 {
pub const route_event = struct {
pub const Input = struct {
cmd: []const u8,
};
pub const Output = []const u8;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> SUBFLOW: tests/regression/320_CONTROL_FLOW/320_140_string_equality_if_dispatch/input.k:12
const cmd = __koru_event_input.cmd;
_ = &cmd;
_ = &__koru_event_input;
if ((blk: { const __koru_l = cmd; const __koru_r = "start"; const __koru_ln = if (@typeInfo(@TypeOf(__koru_l)) == .optional) __koru_l == null else false; const __koru_rn = if (@typeInfo(@TypeOf(__koru_r)) == .optional) __koru_r == null else false; break :blk (__koru_ln == __koru_rn) and (__koru_ln or @import("std").mem.eql(u8, if (@typeInfo(@TypeOf(__koru_l)) == .optional) __koru_l.? else __koru_l, if (@typeInfo(@TypeOf(__koru_r)) == .optional) __koru_r.? else __koru_r)); })) {
{ return "starting";
}
} else {
{ return "unknown";
}
}
}
};
pub const gate_event = struct {
pub const Input = struct {
word: []const u8,
};
pub const Output = i64;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> SUBFLOW: tests/regression/320_CONTROL_FLOW/320_140_string_equality_if_dispatch/input.k:18
const word = __koru_event_input.word;
_ = &word;
_ = &__koru_event_input;
if (!(blk: { const __koru_l = word; const __koru_r = "secret"; const __koru_ln = if (@typeInfo(@TypeOf(__koru_l)) == .optional) __koru_l == null else false; const __koru_rn = if (@typeInfo(@TypeOf(__koru_r)) == .optional) __koru_r == null else false; break :blk (__koru_ln == __koru_rn) and (__koru_ln or @import("std").mem.eql(u8, if (@typeInfo(@TypeOf(__koru_l)) == .optional) __koru_l.? else __koru_l, if (@typeInfo(@TypeOf(__koru_r)) == .optional) __koru_r.? else __koru_r)); }) and !(blk: { const __koru_l = word; const __koru_r = "admin"; const __koru_ln = if (@typeInfo(@TypeOf(__koru_l)) == .optional) __koru_l == null else false; const __koru_rn = if (@typeInfo(@TypeOf(__koru_r)) == .optional) __koru_r == null else false; break :blk (__koru_ln == __koru_rn) and (__koru_ln or @import("std").mem.eql(u8, if (@typeInfo(@TypeOf(__koru_l)) == .optional) __koru_l.? else __koru_l, if (@typeInfo(@TypeOf(__koru_r)) == .optional) __koru_r.? else __koru_r)); })) {
{ return 0;
}
} else {
{ return 1;
}
}
}
};
// >>> FLOW: tests/regression/320_CONTROL_FLOW/320_140_string_equality_if_dispatch/input.k:22 ~input:route()
pub fn flow0() void {
const r = main_module.route_event.handler(.{ .cmd = "start" });
(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", .{r});
}
// >>> FLOW: tests/regression/320_CONTROL_FLOW/320_140_string_equality_if_dispatch/input.k:23 ~input:route()
pub fn flow1() void {
const r2 = main_module.route_event.handler(.{ .cmd = "stop" });
(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", .{r2});
}
// >>> FLOW: tests/regression/320_CONTROL_FLOW/320_140_string_equality_if_dispatch/input.k:24 ~input:gate()
pub fn flow2() void {
const a = main_module.gate_event.handler(.{ .word = "guest" });
(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("{d}\n", .{a});
}
// >>> FLOW: tests/regression/320_CONTROL_FLOW/320_140_string_equality_if_dispatch/input.k:25 ~input:gate()
pub fn flow3() void {
const b = main_module.gate_event.handler(.{ .word = "secret" });
(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("{d}\n", .{b});
}
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.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(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 route_event {
public struct Input {
public string cmd;
}
public static string handler(Input __koru_input) {
var cmd = __koru_input.cmd;
if (cmd == "start") {
{ return "starting";
}
} else {
{ return "unknown";
}
}
return default;
}
}
public static class gate_event {
public struct Input {
public string word;
}
public static long handler(Input __koru_input) {
var word = __koru_input.word;
if (word != "secret" && word != "admin") {
{ return 0;
}
} else {
{ return 1;
}
}
return default;
}
}
public static class std_control_if_event {
public struct Input {
public string expr;
}
public struct Output {
public string tag;
public object then;
public object @else;
}
public static Output handler(Input __koru_input) {
var expr = __koru_input.expr;
throw new global::System.Exception("if: |template| proc is inlined at call sites and must never be called");
}
}
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 r = main_module.route_event.handler(new route_event.Input { cmd = (string)("start")});
__koru_stdout_write("" + (r) + "\n");
}
public static void flow1() {
var r2 = main_module.route_event.handler(new route_event.Input { cmd = (string)("stop")});
__koru_stdout_write("" + (r2) + "\n");
}
public static void flow2() {
var a = main_module.gate_event.handler(new gate_event.Input { word = (string)("guest")});
__koru_stdout_write("" + __koru_str(a) + "\n");
}
public static void flow3() {
var b = main_module.gate_event.handler(new gate_event.Input { word = (string)("secret")});
__koru_stdout_write("" + __koru_str(b) + "\n");
}
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
subflow ~route click a branch to expand · @labels scroll to their anchor
if (cmd == "start")
subflow ~gate click a branch to expand · @labels scroll to their anchor
if (word != "secret" and word != "admin")
flow ~route click a branch to expand · @labels scroll to their anchor
route (cmd: "start")
flow ~route click a branch to expand · @labels scroll to their anchor
route (cmd: "stop")
flow ~gate click a branch to expand · @labels scroll to their anchor
gate (word: "guest")
flow ~gate click a branch to expand · @labels scroll to their anchor
gate (word: "secret")
Test Configuration
MUST_RUN LANGUAGES: zig js cs