Function write_text_run 

pub fn write_text_run<W>(
    writer: &mut Writer<W>,
    run: &TextRun,
) -> Result<(), Error>
where
    W: Write,

Writes one EG_TextRun choice — <a:r>..</a:r> for TextRun::Regular, <a:br../>/<a:br>..</a:br> for TextRun::LineBreak.