[io] LockableFileWriter.close() ignores exceptional return value of java.io.File.delete()

[Gary Gregory]

Should LockableFileWriter.close() be changed from:

    public void close() throws IOException {
        try {
            out.close();
        } finally {
            lockFile.delete();
        }

to:

    public boolean close() throws IOException {
        try {
            out.close();
        } finally {
            return lockFile.delete();
        }

?

Gary

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