✓
Passing This code compiles and runs correctly.
Code
// PINS: handling ONE of a callee's several terminals reads the branch that is
// actually active, not the one the author happened to name.
//
// The store is capacity 4 and holds one row, so `insert` returns `| row`. The
// arm names only `| full`. Before the fix the emitter took its single-branch
// shortcut and read the payload unconditionally —
//
// const f = result_2.full;
//
// — which is `access of union field 'full' while field 'row' is active` at
// runtime, and a segfault in a release build. Nothing at compile time sees it.
//
// The shortcut is sound when the callee has nowhere else to go; it is unsound
// the moment the callee declares several terminals and the author names one.
// 690_085 made exactly that ordinary by making `| row` OPTIONAL — before it,
// every insert named both outcomes and the unsound path was unreachable. So the
// defect is not in either change; it is the pair, and it shipped green because
// no test handled `| full` alone.
//
// An unhandled sibling outcome stays a no-op (690_085's rule), so the guard
// needs no `else`: this program simply inserts the row and runs on.
//
// Found by Lars running koru-examples/downloads after `| row _ |> _` was dropped
// as ceremony — the drop was correct and the crash was underneath it, waiting.
import std/io
import std/string
import std/store
std/store:new(bin, capacity: 4) { label: *std/string:String<std/string:instance!> }
std/string:from-page(text: "a")
| ok a |> std/string:take(s: a): m |> std/store:insert(bin) { label: m }
| full f |> std/string:free(s: f)
| err _ |> _
std/io:print.ln("survived")
Actual
survived
Expected output
✓ Zig✓ C#survived
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 'bin' created (SoA cell + insert/query/write/take/stripe units); fields label: *std/string:String<std/string:instance!>
// >>> FLOW: tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:32 ~std.string:from_page()
pub fn flow0() void {
const result_0 = koru_std.koru_string.from_page_event.handler(.{ .text = "a" });
switch (result_0) {
// >>> BRANCH: tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:33 | ok a |>
.ok => |a| {
const m = koru_std.koru_string.take_event.handler(.{ .s = a });
_ = &m;
const result_2 = main_module.__store_insertf_bin_event.handler(.{ .label = m, .__site_line = 33 });
_ = &result_2;
switch (result_2) {
// >>> BRANCH: tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:34 | full f |>
.full => |f| {
_ = koru_std.koru_string.free_event.handler(.{ .s = f });
},
// >>> BRANCH: tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:33 | row _auto_6 |>
.row => |_| {
},
}
},
// >>> BRANCH: tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:35 | err _auto_7 |>
.err => |_| {
},
}
}
// >>> FLOW: tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:37 ~std.io:print.impl()
pub fn flow1() void {
(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("survived\n", .{});
}
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_bin = struct {
label: [4]*koru_std.koru_string.String = undefined,
len: usize = 0,
};
var __koru_store_bin: __KoruStoreT_bin = .{};
const __KoruStoreRow_bin = struct { label: *koru_std.koru_string.String };
pub const __store_insertf_bin_event = struct {
pub const Input = struct {
label: *koru_std.koru_string.String,
__site_line: i64,
};
pub const Output = union(enum(u8)) {
row: i64,
full: *koru_std.koru_string.String,
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: __store_insertf_bin [tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:30]
const label = __koru_event_input.label;
const __site_line = __koru_event_input.__site_line;
_ = &label;
_ = &__site_line;
_ = &__koru_event_input;
if (__koru_store_bin.len >= 4) return .{ .full = label };
if (__koru_store_bin.len >= 4) @panic("std/store: store 'bin' is full (capacity 4) - declared capacity and the `| full` branch are pinned at 690_011");
const __koru_new_row = __koru_store_bin.len;
__koru_store_bin.label[__koru_new_row] = label;
__koru_store_bin.len += 1;
return .{ .row = @as(i64, @intCast(__koru_new_row)) };
}
};
pub const __store_apply_bin_event = struct {
pub const Input = struct {
row: usize,
field: i64,
value_0: *koru_std.koru_string.String,
};
pub const Output = union(enum(u8)) {
label: *koru_std.koru_string.String,
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: __store_apply_bin [tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:30]
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: { const __koru_old_ptr = __koru_store_bin.label[__koru_r]; _ = koru_std.koru_string.free_event.handler(.{ .s = __koru_old_ptr }); __koru_store_bin.label[__koru_r] = value_0; break :blk .{ .label = __koru_store_bin.label[__koru_r] }; },
else => unreachable,
};
}
};
pub const __store_fapply_bin_0_event = struct {
pub const Input = struct {
row: usize,
value: *koru_std.koru_string.String,
};
pub const Output = union(enum(u8)) {
label: *koru_std.koru_string.String,
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: __store_fapply_bin_0 [tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:30]
const row = __koru_event_input.row;
const value = __koru_event_input.value;
_ = &row;
_ = &value;
_ = &__koru_event_input;
const __koru_r: usize = row;
const __koru_old_ptr = __koru_store_bin.label[__koru_r]; _ = koru_std.koru_string.free_event.handler(.{ .s = __koru_old_ptr }); __koru_store_bin.label[__koru_r] = value; return .{ .label = __koru_store_bin.label[__koru_r] };
}
};
pub const __store_teardown_bin_event = struct {
pub const Input = struct {
};
pub const Output = void;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: __store_teardown_bin [tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:30]
_ = &__koru_event_input;
for (0..__koru_store_bin.len) |__koru_i| {
_ = koru_std.koru_string.free_event.handler(.{ .s = __koru_store_bin.label[__koru_i] });
}
__koru_store_bin.len = 0;
return;
}
};
// >>> FLOW: tests/regression/600_STDLIB/690_STORE/690_095_sparse_dispatch_reads_the_active_branch/input.k:30 ~input:__store_teardown_bin()
pub fn flow2() void {
_ = main_module.__store_teardown_bin_event.handler(.{ });
}
};
pub const koru_std = struct {
pub const koru_string = struct {
const std = @import("std");
pub const String = struct {
data: []u8,
allocator: std.mem.Allocator,
pub fn slice(self: String) []const u8 {
return self.data;
}
fn deinit(self: String) void {
self.allocator.free(self.data);
}
};
pub const from_page_event = struct {
pub const Input = struct {
text: []const u8,
};
pub const Output = union(enum(u8)) {
ok: *koru_std.koru_string.String,
err: []const u8,
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: from_page [/Users/larsde/src/koru/koru_std/string.kz:54]
const text = __koru_event_input.text;
_ = &text;
_ = &__koru_event_input;
const allocator = koru_allocator();
const data = allocator.alloc(u8, text.len) catch {
return .{ .err = "allocation failed" };
};
@memcpy(data, text);
const s = allocator.create(String) catch {
allocator.free(data);
return .{ .err = "allocation failed" };
};
s.* = .{ .data = data, .allocator = allocator };
return .{ .ok = s };
}
};
pub const take_event = struct {
pub const Input = struct {
s: *koru_std.koru_string.String,
};
pub const Output = *koru_std.koru_string.String;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
const s = __koru_event_input.s;
_ = &s;
return s;
}
};
pub const release_event = struct {
pub const Input = struct {
s: *koru_std.koru_string.String,
};
pub const Output = *koru_std.koru_string.String;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
const s = __koru_event_input.s;
_ = &s;
return s;
}
};
pub const free_event = struct {
pub const Input = struct {
s: *koru_std.koru_string.String,
};
pub const Output = void;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: free [/Users/larsde/src/koru/koru_std/string.kz:91]
const s = __koru_event_input.s;
_ = &s;
_ = &__koru_event_input;
s.allocator.free(s.data);
s.allocator.destroy(s);
}
};
pub const len_event = struct {
pub const Input = struct {
s: *koru_std.koru_string.String,
};
pub const Output = usize;
pub fn handler(__koru_event_input: @This().Input) @This().Output {
const s = __koru_event_input.s;
_ = &s;
return s.data.len;
}
};
};
};
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.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 'bin' created (SoA cell + insert/query/write/take/stripe units); fields label: *std/string:String<std/string:instance!>
static class __koru_store_bin {
public static dynamic[] label = new dynamic[4];
public static long len = 0;
public static long __koru_brand = -1;
}
public static class __store_insertf_bin_event {
public struct Input {
public dynamic label;
public long __site_line;
}
public struct Output {
public string tag;
public long row;
public dynamic full;
}
public static Output handler(Input __koru_input) {
var label = __koru_input.label;
var __site_line = __koru_input.__site_line;
if (__koru_store_bin.len >= 4) return new Output { tag = "full", full = label };
if (__koru_store_bin.len >= 4) throw new global::System.Exception("std/store: store 'bin' is full (capacity 4) - declared capacity and the `| full` branch are pinned at 690_011");
long __koru_new_row = __koru_store_bin.len;
__koru_store_bin.label[__koru_new_row] = label;
__koru_store_bin.len += 1;
return new Output { tag = "row", row = __koru_new_row };
return default;
}
}
public static class __store_apply_bin_event {
public struct Input {
public long row;
public long field;
public dynamic value_0;
}
public struct Output {
public string tag;
public dynamic label;
}
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: { var __koru_old_ptr = __koru_store_bin.label[__koru_r]; main_module.std_string_free_event.handler(new main_module.std_string_free_event.Input { s = __koru_old_ptr }); __koru_store_bin.label[__koru_r] = value_0; return new Output { tag = "label", label = __koru_store_bin.label[__koru_r] }; }
}
throw new global::System.Exception("__store_apply_bin: field index " + field + " is not a column of store 'bin'");
return default;
}
}
public static class __store_fapply_bin_0_event {
public struct Input {
public long row;
public dynamic value;
}
public struct Output {
public string tag;
public dynamic label;
}
public static Output handler(Input __koru_input) {
var row = __koru_input.row;
var value = __koru_input.value;
var __koru_r = row;
var __koru_old_ptr = __koru_store_bin.label[__koru_r]; main_module.std_string_free_event.handler(new main_module.std_string_free_event.Input { s = __koru_old_ptr }); __koru_store_bin.label[__koru_r] = value; return new Output { tag = "label", label = __koru_store_bin.label[__koru_r] };
return default;
}
}
public static class __store_teardown_bin_event {
public struct Input {
}
public static dynamic handler(Input __koru_input) {
for (var __koru_i = 0; __koru_i < __koru_store_bin.len; __koru_i++) {
main_module.std_string_free_event.handler(new main_module.std_string_free_event.Input { s = __koru_store_bin.label[__koru_i] });
}
__koru_store_bin.len = 0;
return default;
}
}
public static class std_io_print_impl_event {
public struct Input {
public dynamic expr;
}
public static dynamic handler(dynamic __koru_input) {
throw new global::System.Exception("std.io:impl has no C# implementation — its body resolves only to a non-cs target (|zig / [comptime]), directly or through a callee");
}
}
public static class std_string_from_page_event {
public struct Input {
public string text;
}
public struct Output {
public string tag;
public dynamic ok;
public string err;
}
public static Output handler(Input __koru_input) {
var text = __koru_input.text;
return new Output { tag = "ok", ok = new __KoruBox { data = text } };
return default;
}
}
public static class std_string_take_event {
public struct Input {
public dynamic s;
}
public static dynamic handler(Input __koru_input) {
var s = __koru_input.s;
return (dynamic)(s);
}
}
public static class std_string_release_event {
public struct Input {
public dynamic s;
}
public static dynamic handler(Input __koru_input) {
var s = __koru_input.s;
return (dynamic)(s);
}
}
public static class std_string_free_event {
public struct Input {
public dynamic s;
}
public static dynamic handler(Input __koru_input) {
var s = __koru_input.s;
// GC is the implementation. There is no allocator to hand the bytes back
// to, so the honest body is empty — this is a port, not a stub.
return default;
}
}
public static class std_string_len_event {
public struct Input {
public dynamic s;
}
public static long handler(Input __koru_input) {
var s = __koru_input.s;
return (long)(s.data.Length);
}
}
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 result_0 = main_module.std_string_from_page_event.handler(new std_string_from_page_event.Input { text = (string)("a")});
if (result_0.tag == "ok") {
var a = result_0.ok;
var m = main_module.std_string_take_event.handler(new std_string_take_event.Input { s = a});
var result_1 = main_module.__store_insertf_bin_event.handler(new __store_insertf_bin_event.Input { label = m, __site_line = (long)(33)});
if (result_1.tag == "full") {
var f = result_1.full;
{
var __koru_p_s = f;
// GC is the implementation. There is no allocator to hand the bytes back
// to, so the honest body is empty — this is a port, not a stub.
}
}
if (result_1.tag == "row") {
var _auto_6 = result_1.row;
}
}
if (result_0.tag == "err") {
var _auto_7 = result_0.err;
}
}
public static void flow1() {
__koru_stdout_write("survived" + "\n");
}
public static void flow2() {
main_module.koru_start_event.handler(new koru_start_event.Input { });
}
public static void flow3() {
main_module.koru_end_event.handler(new koru_end_event.Input { });
}
public static void flow4() {
{
for (var __koru_i = 0; __koru_i < __koru_store_bin.len; __koru_i++) {
main_module.std_string_free_event.handler(new main_module.std_string_free_event.Input { s = __koru_store_bin.label[__koru_i] });
}
__koru_store_bin.len = 0;
}
}
}
static class Program {
static void Main() {
main_module.flow2();
main_module.flow0();
main_module.flow1();
main_module.flow4();
main_module.flow3();
}
}
Flows
flow ~new click a branch to expand · @labels scroll to their anchor
new (bin, capacity: 4, source: label: *std/string:String<std/string:instance!>)
flow ~from-page click a branch to expand · @labels scroll to their anchor
from-page (text: "a")
flow ~print.ln click a branch to expand · @labels scroll to their anchor
print.ln (expr: "survived")
Test Configuration
MUST_RUN LANGUAGES: zig cs