Fraction class prototype and test (not to be committed).

runtime/vm/object_service.cc

 // 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.
 
 #include "vm/debugger.h"
 #include "vm/disassembler.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 1239 matching lines @@
   jsobj.AddServiceId(*this);
   jsobj.AddProperty("valueAsString", ToCString());
 }
 
 
 void Bigint::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Integer::PrintJSONImpl(stream, ref);
 }
 
 
+void Fraction::PrintJSONImpl(JSONStream* stream, bool ref) const {
+  UNIMPLEMENTED();
+}
+
+
 void String::PrintJSONImpl(JSONStream* stream, bool ref) const {
   JSONObject jsobj(stream);
   if (raw() == Symbols::OptimizedOut().raw()) {
     // TODO(turnidge): This is a hack.  The user could have this
     // special string in their program.  Fixing this involves updating
     // the debugging api a bit.
     jsobj.AddProperty("type", "Sentinel");
     jsobj.AddProperty("kind", "OptimizedOut");
     jsobj.AddProperty("valueAsString", "<optimized out>");
     return;
@@ skipping 327 matching lines @@
   jsobj.AddProperty("mirrorReferent", referent_handle);
 }
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 #endif
 
 }  // namespace dart