carbon-lang/explorer/testdata/basic_syntax/choice.carbon

// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// RUN: %{explorer-run}
// RUN: %{explorer-run-trace}
// CHECK:STDOUT: result: 0

package ExplorerTest api;

choice Ints {
  None,
  One(i32),
  Two(i32, i32)
}

fn Main() -> i32 {
  var x: Ints = Ints.None();
  var y: Ints = Ints.One(42);
  var n: i32 = 0;
  match (y) {
    case Ints.None() => { n = n + 2; }
    case Ints.One(x: auto) => { n = x + 1 - 42; }
    case Ints.Two(a: auto, b: auto) => { n = 2; }
  }
  match (x) {
    case Ints.One(x: auto) => { n = x + 2; }
    case Ints.None() => { n = n - 1; }
    case Ints.Two(x: auto, y: auto) => { n = 5; }
  }
  return n;
}

// Test some alternate syntaxes
choice MoreInts {
  None(),
  One(i32),
  Two(i32, i32),
}