Fix VM implementation of CastError not to extend TypeError (issue 5280).

runtime/lib/error.dart

Index: runtime/lib/error.dart
===================================================================
--- runtime/lib/error.dart	(revision 25781)
+++ runtime/lib/error.dart	(working copy)
@@ -1,119 +0,0 @@
-// Copyright (c) 2012, 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.
-// Changes here should also be reflected in corelib/error.dart as well
-
-class _AssertionErrorImplementation extends AssertionError {
-  _AssertionErrorImplementation(
-    this.failedAssertion, this.url, this.line, this.column);
-
-  static _throwNew(int assertionStart, int assertionEnd)
-      native "AssertionError_throwNew";
-
-  String toString() {
-    return "'$url': Failed assertion: line $line pos $column: "
-        "'$failedAssertion' is not true.";
-  }
-  final String failedAssertion;
-  final String url;
-  final int line;
-  final int column;
-}
-
-class _TypeErrorImplementation
-    extends _AssertionErrorImplementation
-    implements TypeError {
-
-  _TypeErrorImplementation(
-    String failedAssertion, String url, int line, int column,
-    this.srcType, this.dstType, this.dstName, this._malformedError)
-      : super(failedAssertion, url, line, column);
-
-  static _throwNew(int location,
-                   Object src_value,
-                   String dst_type_name,
-                   String dst_name,
-                   String malformed_error)
-      native "TypeError_throwNew";
-
-  String toString() {
-    String str = (_malformedError != null) ? _malformedError : "";
-    if ((dstName != null) && (dstName.length > 0)) {
-      str = "${str}type '$srcType' is not a subtype of "
-            "type '$dstType' of '$dstName'.";
-    } else {
-      str = "${str}malformed type used.";
-    }
-    return str;
-  }
-
-  final String srcType;
-  final String dstType;
-  final String dstName;
-  final String _malformedError;
-}
-
-class _CastErrorImplementation
-    extends _TypeErrorImplementation
-    implements CastError {
-
-  _CastErrorImplementation(
-    String failedAssertion, String url, int line, int column,
-    String srcType, String dstType, String dstName, String malformedError)
-      : super(failedAssertion, url, line, column,
-              srcType, dstType, dstName, malformedError);
-
-  // A CastError is allocated by TypeError._throwNew() when dst_name equals
-  // Exceptions::kCastErrorDstName.
-  String toString() {
-    String str = (_malformedError != null) ? _malformedError : "";
-    if ((dstName != null) && (dstName.length > 0)) {
-      str = "${str}type '$srcType' is not a subtype of "
-            "type '$dstType' in type cast.";
-    } else {
-      str = "${str}malformed type used in type cast.";
-    }
-    return str;
-  }
-}
-
-class _FallThroughErrorImplementation extends FallThroughError {
-
-  _FallThroughErrorImplementation(this._url, this._line);
-
-  static _throwNew(int case_clause_pos) native "FallThroughError_throwNew";
-
-  String toString() {
-    return "'$_url': Switch case fall-through at line $_line.";
-  }
-
-  final String _url;
-  final int _line;
-}
-
-class _InternalError {
-  const _InternalError(this._msg);
-  String toString() => "InternalError: '${_msg}'";
-  final String _msg;
-}
-
-
-class _AbstractClassInstantiationErrorImplementation
-    extends AbstractClassInstantiationError {
-
-  _AbstractClassInstantiationErrorImplementation(
-      String className, this._url, this._line)
-      : super(className);
-
-  static _throwNew(int case_clause_pos, String className)
-      native "AbstractClassInstantiationError_throwNew";
-
-  String toString() {
-    return "Cannot instantiate abstract class $_className: "
-           "_url '$_url' line $_line";
-  }
-
-  final String _url;
-  final int _line;
-}