import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableList;
import com.google.common.hash.Hashing;
import com.google.common.primitives.Bytes;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.RandomAccessFile;

    groupBy { it.targetType }


private
fun writeExtensionsTo(outputFile: File, packageName: String, targetType: ApiType, extensions: List<KotlinExtensionFunction>): Unit =
    outputFile.bufferedWriter().use { writer ->
        writer.write(fileHeaderFor(packageName, isIncubatingFileClass(targetType, extensions)))
        writer.write("\n")
        extensions.forEach {

    }

    /**
     * 必要があればライターを{@link BufferedWriter}でラップします。
     *
     * @param writer
     *            ライター
     * @return ラップされたライター
     */
    protected static Writer wrap(final Writer writer) {
        if (writer instanceof BufferedWriter) {
            return writer;
        }
        if (writer instanceof StringWriter) {