tests/language_strong/ref_before_declaration_test.dart

// Copyright (c) 2013, 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.

// Test compile-time errors for illegal variable declarations if the name
// has been referenced before the variable is declared.

import 'dart:math' as math;

use(value) => value;

var x = 0;
final y = 0;

class C {
  var f;
  C() : f = 'How do you spell PTSD?';

  void test1() {
  	use(f);  // Refers to instance field f.
    var f = 'A shut mouth gathers no foot.';  /// 00: compile-time error
  }

  void test2() {
  	void localFunc() {
      use(f);  // Refers to instance field f.
  	}

    var f = 'When chemists die, they barium.';  /// 01: compile-time error
    if (true) {
      var f = 1; // ok, shadows outer f and instance field f.
    }
  }

  void test3() {
    if (true) {
      use(x);  // Refers to top-level x.
      use(y);  // Refers to top-level y.
    }
    final x = "I have not yet begun to procrastinate.";  /// 02: compile-time error
    const y = "Honk if you like peace and quiet!";  /// 03: compile-time error
  }

  void test4() {
    void Q() {
      P();  // Refers to non-existing top-level function P
    }
    void P() {  /// 06: compile-time error
      Q();      /// 06: continued
    }           /// 06: continued

    Function f = () {x = f;};  /// 07: compile-time error
  }

  test() {
    test1();
    test2();
    test3();
    test4();
  }
}

void testTypeRef() {
  String s = 'Can vegetarians eat animal crackers?';
  var String = "I distinctly remember forgetting that.";  /// 04: compile-time error
}

void testLibPrefix() {
  var pie = math.PI;
  final math = 0;  /// 05: compile-time error
}


void noErrorsExpected() {
  use(x);
  for (var x = 0; x < 10; x++) use(x);
  for (var i = 0; i < 10; i++) var x = 0;
  if (true) var x = 0;
  while (false) var x = 0;
  try { throw "ball"; } catch (x) { use(x); }
  switch (x) {
     case 0: var x = 'Does fuzzy logic tickle?';
  }
  var int = 007;
}

void main() {
  var c = new C();
  c.test();
  testTypeRef();
  testLibPrefix();
  noErrorsExpected();
}