sdk/runtime/lib/error.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.
// Errors are created and thrown by DartVM only.

class AssertError {
  factory AssertError._uninstantiable() {
    throw const UnsupportedOperationException(
        "AssertError can only be allocated by the VM");
  }
  static throwNew(int assertionStart, int assertionEnd)
      native "AssertError_throwNew";
  String toString() {
    return "Failed assertion: '$failedAssertion' is not true " +
        "in $url at line $line, column $column.";
  }
  final String failedAssertion;
  final String url;
  final int line;
  final int column;
}

class TypeError extends AssertError {
  factory TypeError._uninstantiable() {
    throw const UnsupportedOperationException(
        "TypeError can only be allocated by the VM");
  }
  String toString() {
    return "Failed type check: type $srcType is not assignable to type " +
        "$dstType of $dstName in $url at line " +
        "$line, column $column.";
  }
  final String srcType;
  final String dstType;
  final String dstName;
}

class FallThroughError {
  factory FallThroughError._uninstantiable() {
    throw const UnsupportedOperationException(
        "FallThroughError can only be allocated by the VM");
  }
  static throwNew(int case_clause_pos) native "FallThroughError_throwNew";
  String toString() {
    return "Switch case fall-through in $url at line $line.";
  }
  final String url;
  final int line;
}

class InternalError {
  const InternalError(this._msg);
  String toString() => "InternalError: '${_msg}'";
  final String _msg;
}