Unifying compiler context

pkg/front_end/lib/compilation_error.dart

-// Copyright (c) 2016, 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.
-
-/// Defines the API for the front end to communicate information about
-/// compilation errors to clients.
-library front_end.compilation_error;
-
-import 'package:source_span/source_span.dart' show SourceSpan;
-
-/// A single error that occurred during compilation, and information about where
-/// it occurred and how to fix it.
-///
-/// TODO(paulberry): add a reference to the analyzer error code.
-///
-/// Not intended to be implemented or extended by clients.
-// TODO(sigmund): rename to CompliationMessage
-abstract class CompilationError {
-  /// A text description of the compile error.
-  String get message;
-
-  /// A suggestion for the user to hint them on how to fix the error. May be
-  /// `null`.
-  String get tip;
-
-  /// The source span where the error occurred.
-  SourceSpan get span;
-}