Lazily format LanguageError messages (fix issue 15069).

runtime/lib/mirrors.cc

 // 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.
 
 #include "lib/invocation_mirror.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
@@ skipping 33 matching lines @@
 
   Exceptions::ThrowByType(Exceptions::kMirroredCompilationError, args);
   UNREACHABLE();
 }
 
 
 static void ThrowInvokeError(const Error& error) {
   if (FLAG_use_mirrored_compilation_error && error.IsLanguageError()) {
     // A compilation error that was delayed by lazy compilation.
     const LanguageError& compilation_error = LanguageError::Cast(error);
-    String& message = String::Handle(compilation_error.message());
+    String& message = String::Handle(compilation_error.FormatMessage());
     ThrowMirroredCompilationError(message);
     UNREACHABLE();
   }
   Exceptions::PropagateError(error);
   UNREACHABLE();
 }
 
 
 // Conventions:
 // * For throwing a NSM in a class klass we use its runtime type as receiver,
@@ skipping 1880 matching lines @@
 
 DEFINE_NATIVE_ENTRY(VariableMirror_type, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(MirrorReference, ref, arguments->NativeArgAt(0));
   const Field& field = Field::Handle(ref.GetFieldReferent());
   GET_NATIVE_ARGUMENT(AbstractType, instantiator, arguments->NativeArgAt(1));
   const AbstractType& type = AbstractType::Handle(field.type());
   return InstantiateType(type, instantiator);
 }
 
 }  // namespace dart