133 cond guarded dispatch

✓ Passing This code compiles and runs correctly.

Code

// Pins the `cond` surface: flat multi-way dispatch replacing the nested
// `if | else |> if …` cascade (810_121). `cond(scrutinee)` takes the value; each
// `| c <binding> when <pred> -> <value>` arm binds the scrutinee and guards it,
// producing when its guard holds; a guardless `| c _` arm is the default. cond
// does no matching itself — it sits on the `when`-guard + branch-binding
// primitive (400_087, 210_078) and lowers to a first-match if/else-if cascade,
// the same way if/for are templates in koru_std/control.kz.
import std/io

pub tor coin-value { k: i64 } -> i64

coin-value = cond(k)
| c k when k == 1 -> 1
| c k when k == 2 -> 5
| c k when k == 3 -> 10
| c k when k == 4 -> 25
| c _ -> 50

coin-value(k: 3): v |> std/io:print.ln("{{ 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);
  public static class coin_value_event {
    public struct Input {
      public long k;
    }
    public static long handler(Input __koru_input) {
      var k = __koru_input.k;
if (k == 1) {
        {         return 1;
 }
    } else if (k == 2) {
        {         return 5;
 }
    } else if (k == 3) {
        {         return 10;
 }
    } else if (k == 4) {
        {         return 25;
 }
    } else {
        {         return 50;
 }
    }
      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 cond_event {
    public struct Input {
      public dynamic expr;
    }
    public struct Output {
      public string tag;
      public dynamic c;
    }
    public static Output handler(Input __koru_input) {
      var expr = __koru_input.expr;
      throw new global::System.Exception("cond: |template| proc is inlined at call sites and must never be called");
    }
  }
  public static void flow0() {
    var v = main_module.coin_value_event.handler(new coin_value_event.Input { k = (long)(3)});
__koru_stdout_write("" + (v) + "\n");
  }
}

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

output_emitted.cs

Actual

Expected output

✓ Zig✓ C#

Flows

subflow ~coin-value click a branch to expand · @labels scroll to their anchor

cond (k)

flow ~coin-value click a branch to expand · @labels scroll to their anchor

coin-value (k: 3)

Test Configuration

MUST_RUN LANGUAGES: zig cs

← 132 else arm keyword escape selfloop 134 cond binder in produce →