Implement --fatal=errors.

pkg/front_end/lib/src/fasta/kernel/body_builder.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.
 
 library fasta.body_builder;
 
 import 'package:front_end/src/fasta/parser/parser.dart' show
     FormalParameterType,
     optional;
 
@@ skipping 18 matching lines @@
     skipNativeClause;
 
 import 'package:front_end/src/fasta/scanner/token.dart' show
     BeginGroupToken,
     Token,
     isBinaryOperator,
     isMinusOperator;
 
 import '../errors.dart' show
     InputError,
-    internalError;
+    internalError,
+    printUnexpected;
 
 import '../source/scope_listener.dart' show
     JumpTargetKind,
     NullValue,
     ScopeListener;
 
 import '../builder/scope.dart' show
     AccessErrorBuilder,
     AmbiguousBuilder,
     Scope;
@@ skipping 2138 matching lines @@
         arguments.putIfAbsent("actual", () => token.value);
         handleRecoverableError(token, ErrorKind.ExpectedButGot, arguments);
       }
       return token;
     }
     return super.handleUnrecoverableError(token, kind, arguments);
   }
 
   @override
   Expression buildCompileTimeError(error, [int charOffset = -1]) {
-    String message = new InputError(uri, charOffset, error).format();
-    print(message);
+    String message = printUnexpected(uri, charOffset, error);
     Builder constructor = library.loader.getCompileTimeError();
     return new Throw(
         buildStaticInvocation(constructor.target,
             new Arguments(<Expression>[new StringLiteral(message)]),
             isConst: false)); // TODO(ahe): Make this const.
   }
 
   Statement buildCompileTimeErrorStatement(error, [int charOffset = -1]) {
     return new ExpressionStatement(buildCompileTimeError(error, charOffset));
   }
@@ skipping 469 matching lines @@
   } else if (node is TypeDeclarationBuilder) {
     return node.name;
   } else if (node is PrefixBuilder) {
     return node.name;
   } else if (node is ThisPropertyAccessor) {
     return node.name.name;
   } else {
     return internalError("Unhandled: ${node.runtimeType}");
   }
 }