144 modulo if dispatch

✓ Passing This code compiles and runs correctly.

Code

// Pins: Koru `%` on a SIGNED runtime value in an `if` condition, on BOTH
// targets. Koru's `%` is C's truncated remainder: the comptime fold
// (comptime_eval.zig folds `.modulo` with `@rem` — its own comment calls that
// "the C-parity choice") and the JS target (its `%` on numbers IS that same
// remainder) already agreed; this pins the Zig emission (`@rem`) into the same
// meaning, where bare `%` is unsigned-only and dies at Stage D quoting Zig's
// builtin list. The shape is 320_140's if-dispatch with the numeric operator.
//
// The condition of a `std/control:if` is a per-call TEMPLATE arg, so it is
// baked into the rendered body before the emitter runs — this pins that seam.
import std/io

pub tor parity { n: i32 } -> string

parity = if (n % 2 == 0)
| then -> "even"
| else -> "odd"

// A two-module hand-off, so `n` is a RUNTIME value: a literal call site
// const-folds, and the body it folded away is never analyzed by the backend.
pub tor via { n: i32 } -> string

via = parity(n): r -> r

via(n: 7): a |> std/io:print.ln(a)
via(n: 8): b |> std/io:print.ln(b)

input.k

Supporting Files

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a_cs_equiv.runtimeconfig.json

odd
even

actual.cs.txt

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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);
  public static class parity_event {
    public struct Input {
      public int n;
    }
    public static string handler(Input __koru_input) {
      var n = __koru_input.n;
if (n % 2 == 0) {
        {         return "even";
 }
    } else {
        {         return "odd";
 }
    }

      return default;
    }
  }
  public static class via_event {
    public struct Input {
      public int n;
    }
    public static string handler(Input __koru_input) {
      var n = __koru_input.n;
      var r = main_module.parity_event.handler(new parity_event.Input { n = (int)(n)});
      return (string)(r);

      return default;
    }
  }
  public static class 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 class if_event {
    public struct Input {
      public dynamic expr;
    }
    public struct Output {
      public string tag;
      public dynamic then;
      public dynamic @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 void flow0() {
    var a = main_module.via_event.handler(new via_event.Input { n = (int)(7)});
__koru_stdout_write("" + (a) + "\n");
  }
  public static void flow1() {
    var b = main_module.via_event.handler(new via_event.Input { n = (int)(8)});
__koru_stdout_write("" + (b) + "\n");
  }
}

static class Program {
  static void Main() {
    main_module.flow0();
    main_module.flow1();
  }
}

output_emitted.cs

Actual

odd
even

Expected output

✓ Zig✓ JavaScript✓ C#

odd
even

Flows

subflow ~parity click a branch to expand · @labels scroll to their anchor

if (n % 2 == 0)

subflow ~via click a branch to expand · @labels scroll to their anchor

parity (n)

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

via (n: 7)

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

via (n: 8)

Test Configuration

MUST_RUN LANGUAGES: zig js cs

← 143 if then required 145 when guard modulo payload →