Language/Statements/Try/syntax_t01.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/**
 * @assertion The try statement supports the definition of exception handling
 * code in a structured way.
 * tryStatement:
 *   try block (onPart+ finallyPart? | finallyPart)
 * ;
 * onPart:
 *   catchPart block |
 *   on type catchPart? block
 * ;
 * catchPart:
 *   catch ‘(’ identifier (‘, ’ identifier)? ‘)’
 * ;
 * finallyPart:
 *   finally block
 * ;
 * A try statement consists of a block statement, followed by at least one of:
 * 1. A set of on-catch clauses, each of which specifies (either explicitly or
 *    implicitly) the type of exception object to be handled, one or two
 *    exception parameters and a block statement.
 * 2. A finally clause, which consists of a block statement.
 * @description Checks that various valid variations of the try statement do not
 * cause a compile-time error.
 * @author rodionov
 */

main() {
  try {
    throw "";
  }
  on int catch (ok) {}
  catch (ok) {}
  finally {}

  try {
    throw "";
  }
  on int catch (ok, st) {}
  catch (wtvr) {}
  finally {}

  try {
    throw "";
  }
  on int catch (ok, st) {}
  on String catch (ok, st) {}

  try {
    try {
      throw "";
    } finally {}
  } catch (ok) {}

  try {
    throw 1;
  }
  on int catch (x) {}
  on double catch (x) {}

  try {
    throw 1;
  }
  on int catch (x) {}
  on num catch (x) {}
  on Object catch (x) {}
}