Function to_writer 

pub fn to_writer<W, T>(writer: W, value: &T) -> Result<()>
where
    W: Write,
    T: ?Sized + Serialize,

Serializes value into writer.

This function does not generate any newlines or nice formatting; if you want that, you can use to_writer_pretty instead.

writer is required to implement core::fmt::Write. To use std::io::Write instead, see Options::to_io_writer.