Program: 81157
Project: 81157
Buggy source:
public <R>TypeAdapter<R> create(Gson gson,TypeToken<R> type){
  if (type.getRawType() != baseType) {
    return null;
  }
  final Map<String,TypeAdapter<?>> labelToDelegate=new LinkedHashMap<String,TypeAdapter<?>>();
  final Map<Class<?>,TypeAdapter<?>> subtypeToDelegate=new LinkedHashMap<Class<?>,TypeAdapter<?>>();
  for (  Map.Entry<String,Class<?>> entry : labelToSubtype.entrySet()) {
    TypeAdapter<?> delegate=gson.getDelegateAdapter(this,TypeToken.get(entry.getValue()));
    labelToDelegate.put(entry.getKey(),delegate);
    subtypeToDelegate.put(entry.getValue(),delegate);
  }
  return new TypeAdapter<R>(){
    @Override public R read(    JsonReader in) throws IOException {
      JsonElement jsonElement=Streams.parse(in);
      JsonElement labelJsonElement=jsonElement.getAsJsonObject().remove(typeFieldName);
      if (labelJsonElement == null) {
        throw new JsonParseException("String_Node_Str" + baseType + "String_Node_Str"+ typeFieldName);
      }
      String label=labelJsonElement.getAsString();
      @SuppressWarnings("String_Node_Str") TypeAdapter<R> delegate=(TypeAdapter<R>)labelToDelegate.get(label);
      if (delegate == null) {
        throw new JsonParseException("String_Node_Str" + baseType + "String_Node_Str"+ label+ "String_Node_Str");
      }
      return delegate.fromJsonTree(jsonElement);
    }
    @Override public void write(    JsonWriter out,    R value) throws IOException {
      Class<?> srcType=value.getClass();
      String label=subtypeToLabel.get(srcType);
      @SuppressWarnings("String_Node_Str") TypeAdapter<R> delegate=(TypeAdapter<R>)subtypeToDelegate.get(srcType);
      if (delegate == null) {
        throw new JsonParseException("String_Node_Str" + srcType.getName() + "String_Node_Str");
      }
      JsonObject jsonObject=delegate.toJsonTree(value).getAsJsonObject();
      if (jsonObject.has(typeFieldName)) {
        throw new JsonParseException("String_Node_Str" + srcType.getName() + "String_Node_Str"+ typeFieldName);
      }
      JsonObject clone=new JsonObject();
      clone.add(typeFieldName,new JsonPrimitive(label));
      for (      Map.Entry<String,JsonElement> e : jsonObject.entrySet()) {
        clone.add(e.getKey(),e.getValue());
      }
      Streams.write(clone,out);
    }
  }
;
}

Fixed version (ground truth):
public <R>TypeAdapter<R> create(Gson gson,TypeToken<R> type){
  if (type.getRawType() != baseType) {
    return null;
  }
  final Map<String,TypeAdapter<?>> labelToDelegate=new LinkedHashMap<String,TypeAdapter<?>>();
  final Map<Class<?>,TypeAdapter<?>> subtypeToDelegate=new LinkedHashMap<Class<?>,TypeAdapter<?>>();
  for (  Map.Entry<String,Class<?>> entry : labelToSubtype.entrySet()) {
    TypeAdapter<?> delegate=gson.getDelegateAdapter(this,TypeToken.get(entry.getValue()));
    labelToDelegate.put(entry.getKey(),delegate);
    subtypeToDelegate.put(entry.getValue(),delegate);
  }
  return new TypeAdapter<R>(){
    @Override public R read(    JsonReader in) throws IOException {
      JsonElement jsonElement=Streams.parse(in);
      JsonElement labelJsonElement=jsonElement.getAsJsonObject().remove(typeFieldName);
      if (labelJsonElement == null) {
        throw new JsonParseException("String_Node_Str" + baseType + "String_Node_Str"+ typeFieldName);
      }
      String label=labelJsonElement.getAsString();
      @SuppressWarnings("String_Node_Str") TypeAdapter<R> delegate=(TypeAdapter<R>)labelToDelegate.get(label);
      if (delegate == null) {
        throw new JsonParseException("String_Node_Str" + baseType + "String_Node_Str"+ label+ "String_Node_Str");
      }
      return delegate.fromJsonTree(jsonElement);
    }
    @Override public void write(    JsonWriter out,    R value) throws IOException {
      Class<?> srcType=value.getClass();
      String label=subtypeToLabel.get(srcType);
      @SuppressWarnings("String_Node_Str") TypeAdapter<R> delegate=(TypeAdapter<R>)subtypeToDelegate.get(srcType);
      if (delegate == null) {
        throw new JsonParseException("String_Node_Str" + srcType.getName() + "String_Node_Str");
      }
      JsonObject jsonObject=delegate.toJsonTree(value).getAsJsonObject();
      if (jsonObject.has(typeFieldName)) {
        throw new JsonParseException("String_Node_Str" + srcType.getName() + "String_Node_Str"+ typeFieldName);
      }
      JsonObject clone=new JsonObject();
      clone.add(typeFieldName,new JsonPrimitive(label));
      for (      Map.Entry<String,JsonElement> e : jsonObject.entrySet()) {
        clone.add(e.getKey(),e.getValue());
      }
      Streams.write(clone,out);
    }
  }
.nullSafe();
}