244 unary minus before a row reference

✓ Passing This code compiles and runs correctly.

Code

// PINS: a unary minus in front of a row reference, and the kebab name that
// must NOT be broken by allowing it.
//
// Kebab-case makes `-` an IDENTIFIER character, so every text rewriter's
// left-boundary test — "the byte before is not an identifier char" — reads
// `-r.v` as the interior of a name like `foo-r` and declines to rewrite. The
// reference then reached the host verbatim as `-r.v`, where `r` does not
// exist: a generated-code error naming a Koru binding, raised against a
// program that is correct Koru.
//
// The only spelling that worked was `- r.v`, WITH A SPACE. Whitespace carries
// no meaning inside an expression in this language, so an author has no reason
// to suspect it and no way to find it.
//
// The disambiguation is local and total, and both halves are pinned here
// because a fix to either one alone is wrong:
//
//   - a `-` belongs to an identifier only when it sits BETWEEN two identifier
//     characters, so `-r.v` and `2 * -r.v` both read the column;
//   - `twice-r` is ONE name. Its trailing `r` is preceded by `-`, which is
//     preceded by `e`, so it must stay untouched. A fix that simply treated
//     every `-` as a boundary would rewrite it into the column read and break
//     every kebab name whose last segment collides with a row binding.
//     It is called as a CHAIN STEP: a tor call inside an envelope value is not
//     a spelling the store lowers, and reaches the host verbatim.
//
// Found by the ECS benchmark's bevy_strength_world port, whose bounce arm
// writes `-d.vx * 0.8` — the plainest way anyone would spell a reflection.
import std/io
import std/store

std/store:new(cells, capacity: 3) { v: i64 }

tor twice-r { x: i64 } -> i64
twice-r -> x * 2

std/store:insert(cells) { v: 5 }
std/store:insert(cells) { v: -3 }

std/store:query(cells)
! query r |> std/store:stored { r.v: -r.v * 2 }

std/store:query(cells)
! query r |> std/store:stored { r.v: 2 * -r.v }

std/store:query(cells)
! query r |> twice-r(x: r.v): d |> std/store:stored { r.v: d }

std/store:query(cells)
! query r |> std/io:print.ln("v {{ r.v:d }}")

input.k

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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 'cells' created (SoA cell + insert/query/write/take/stripe units); fields v: i64
  static class __koru_store_cells {
    public static long[] v = new long[3];
    public static long len = 0;
    public static long __koru_brand = -1;
}

  public static class twice_r_event {
    public struct Input {
      public long x;
    }
    public static long handler(Input __koru_input) {
      var x = __koru_input.x;
      return (long)(x * 2);
    }
  }
  public static class __store_insert_cells_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_cells.len >= 3) throw new global::System.Exception("std/store: store 'cells' is full (capacity 3) - declared capacity and the `| full` branch are pinned at 690_011");
      long __koru_new_row = __koru_store_cells.len;
      __koru_store_cells.v[__koru_new_row] = v;
      __koru_store_cells.len += 1;

      return default;

    }
  }
  public static class __store_apply_cells_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_cells.v[__koru_r] = value_0; return new Output { tag = "v", v = value_0 }; }
      }
      throw new global::System.Exception("__store_apply_cells: field index " + field + " is not a column of store 'cells'");

      return default;

    }
  }
  public static class __store_write_cells_event {
    public struct Input {
      public long row;
      public long field;
      public long value_0;
    }
    public static dynamic handler(Input __koru_input) {
      var row = __koru_input.row;
      var field = __koru_input.field;
      var value_0 = __koru_input.value_0;
      var result_0 = main_module.__store_apply_cells_event.handler(new __store_apply_cells_event.Input { row = (long)(row), field = (long)(field), value_0 = (long)(value_0)});
      var _auto_6 = result_0.v;

      return default;

    }
  }
  public static class __store_sweepbody_cells_L42_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
      public long __koru_sdix_r_L42;
    }
    public static dynamic handler(Input __koru_input) {
      var __koru_sdix_r_L42 = __koru_input.__koru_sdix_r_L42;
      main_module.__store_write_cells_event.handler(new __store_write_cells_event.Input { row = (long)(__koru_sdix_r_L42), field = (long)(0), value_0 = (long)(-__koru_store_cells.v[__koru_sdix_r_L42] * 2)});

      return default;

    }
  }
  public static class __store_sweeprun_cells_L42_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
    }
    public static dynamic handler(Input __koru_input) {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      main_module.__store_sweepbody_cells_L42_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L42_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_sdix_r_L42 = __koru_si });
      }
      }

      return default;

    }
  }
  public static class __store_sweepbody_cells_L45_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
      public long __koru_sdix_r_L45;
    }
    public static dynamic handler(Input __koru_input) {
      var __koru_sdix_r_L45 = __koru_input.__koru_sdix_r_L45;
      main_module.__store_write_cells_event.handler(new __store_write_cells_event.Input { row = (long)(__koru_sdix_r_L45), field = (long)(0), value_0 = (long)(2 * -__koru_store_cells.v[__koru_sdix_r_L45])});

      return default;

    }
  }
  public static class __store_sweeprun_cells_L45_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
    }
    public static dynamic handler(Input __koru_input) {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      main_module.__store_sweepbody_cells_L45_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L45_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_sdix_r_L45 = __koru_si });
      }
      }

      return default;

    }
  }
  public static class __store_sweepbody_cells_L48_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
      public long __koru_srf_r_L48_v;
      public long __koru_sdix_r_L48;
    }
    public static dynamic handler(Input __koru_input) {
      var __koru_srf_r_L48_v = __koru_input.__koru_srf_r_L48_v;
      var __koru_sdix_r_L48 = __koru_input.__koru_sdix_r_L48;
      var d = main_module.twice_r_event.handler(new twice_r_event.Input { x = (long)(__koru_srf_r_L48_v)});
      main_module.__store_write_cells_event.handler(new __store_write_cells_event.Input { row = (long)(__koru_sdix_r_L48), field = (long)(0), value_0 = (long)(d)});

      return default;

    }
  }
  public static class __store_sweeprun_cells_L48_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
    }
    public static dynamic handler(Input __koru_input) {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      var __koru_srf_r_L48_v = __koru_store_cells.v[__koru_si];
      main_module.__store_sweepbody_cells_L48_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L48_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_srf_r_L48_v = __koru_srf_r_L48_v, __koru_sdix_r_L48 = __koru_si });
      }
      }

      return default;

    }
  }
  public static class __store_sweepbody_cells_L51_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
      public long __koru_srf_r_L51_v;
      public long __koru_sdix_r_L51;
    }
    public static dynamic handler(Input __koru_input) {
      var __koru_srf_r_L51_v = __koru_input.__koru_srf_r_L51_v;
      var __koru_sdix_r_L51 = __koru_input.__koru_sdix_r_L51;
__koru_stdout_write("v " + __koru_str(__koru_srf_r_L51_v) + "\n");

      return default;

    }
  }
  public static class __store_sweeprun_cells_L51_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event {
    public struct Input {
    }
    public static dynamic handler(Input __koru_input) {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      var __koru_srf_r_L51_v = __koru_store_cells.v[__koru_si];
      main_module.__store_sweepbody_cells_L51_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L51_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_srf_r_L51_v = __koru_srf_r_L51_v, __koru_sdix_r_L51 = __koru_si });
      }
      }

      return default;

    }
  }
  public static class std_io_print_ln_event {
    public struct Input {
      public dynamic expr;
      public dynamic invocation;
      public dynamic item;
      public dynamic program;
      public dynamic reporter;
      public dynamic allocator;
    }
    public static dynamic handler(Input __koru_input) {
      var expr = __koru_input.expr;
      var invocation = __koru_input.invocation;
      var item = __koru_input.item;
      var program = __koru_input.program;
      var reporter = __koru_input.reporter;
      var allocator = __koru_input.allocator;
      throw new global::System.Exception("ln: [transform] tor is lowered at compile time and must never be called");

    }
  }
  public static void flow0() {
    {
      var __koru_p_v = (long)(5);
      var __koru_p___site_line = (long)(38);
      if (__koru_store_cells.len >= 3) throw new global::System.Exception("std/store: store 'cells' is full (capacity 3) - declared capacity and the `| full` branch are pinned at 690_011");
      long __koru_new_row = __koru_store_cells.len;
      __koru_store_cells.v[__koru_new_row] = __koru_p_v;
      __koru_store_cells.len += 1;
    }
  }
  public static void flow1() {
    {
      var __koru_p_v = (long)(-3);
      var __koru_p___site_line = (long)(39);
      if (__koru_store_cells.len >= 3) throw new global::System.Exception("std/store: store 'cells' is full (capacity 3) - declared capacity and the `| full` branch are pinned at 690_011");
      long __koru_new_row = __koru_store_cells.len;
      __koru_store_cells.v[__koru_new_row] = __koru_p_v;
      __koru_store_cells.len += 1;
    }
  }
  public static void flow2() {
    {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      main_module.__store_sweepbody_cells_L42_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L42_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_sdix_r_L42 = __koru_si });
      }
      }
    }
  }
  public static void flow3() {
    {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      main_module.__store_sweepbody_cells_L45_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L45_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_sdix_r_L45 = __koru_si });
      }
      }
    }
  }
  public static void flow4() {
    {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      var __koru_srf_r_L48_v = __koru_store_cells.v[__koru_si];
      main_module.__store_sweepbody_cells_L48_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L48_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_srf_r_L48_v = __koru_srf_r_L48_v, __koru_sdix_r_L48 = __koru_si });
      }
      }
    }
  }
  public static void flow5() {
    {
      {
      for (var __koru_si = 0; __koru_si < __koru_store_cells.len; __koru_si++) {
      var __koru_srf_r_L51_v = __koru_store_cells.v[__koru_si];
      main_module.__store_sweepbody_cells_L51_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.handler(new main_module.__store_sweepbody_cells_L51_690_244_unary_minus_before_a_row_reference_input_a8a3a1_event.Input { __koru_srf_r_L51_v = __koru_srf_r_L51_v, __koru_sdix_r_L51 = __koru_si });
      }
      }
    }
  }
}

static class Program {
  static void Main() {
    main_module.flow0();
    main_module.flow1();
    main_module.flow2();
    main_module.flow3();
    main_module.flow4();
    main_module.flow5();
  }
}

output_emitted.cs

Actual

v 40
v -24

Expected output

✓ Zig✓ C#

v 40
v -24

Flows

flow ~new click a branch to expand · @labels scroll to their anchor

new (cells, capacity: 3, source: v: i64)

flow ~insert click a branch to expand · @labels scroll to their anchor

insert (cells, source: v: 5)

flow ~insert click a branch to expand · @labels scroll to their anchor

insert (cells, source: v: -3)

flow ~query click a branch to expand · @labels scroll to their anchor

query (cells)

flow ~query click a branch to expand · @labels scroll to their anchor

query (cells)

flow ~query click a branch to expand · @labels scroll to their anchor

query (cells)

flow ~query click a branch to expand · @labels scroll to their anchor

query (cells)

Test Configuration

MUST_RUN LANGUAGES: zig cs

← 243 sweep body reaches enclosing tor input 245 indexed read in plural envelope and nested →