/// Modify the lifetime of self by serialising the data into the target.
/// The output will reference the copy in the target
trait RaiseTo {
    type Target;
    type Output<'a>;
    fn raise_to<'a>(&self, target: &'a mut Self::Target) -> Self::Output<'a>;
}

}
impl<'a> RaiseTo for Media<'a> {
    type Target = String;
    type Output<'a> = Media<'a>;
    fn raise_to<'a>(&self, target: &'a mut Self::Target) -> Self::Output<'a> {
        match self {
            Media::Gemini(gem) => todo!(),
            Media::Text(text) => text.raise_to(target),
        }
    }

impl<'tl> RaiseTo for TextLine<'tl> {
    type Target = String;
    type Output<'a> = TextLine<'a>;
    fn raise_to<'a>(&self, target: &'a mut String) -> Self::Output<'a> {
        let old_end = target.len();
        target.push_str(self.0);
        TextLine(&target[old_end..])
    }
}
impl<'st> RaiseTo for &'st str {
    type Target = String;
    type Output<'a> = &'a str;
    fn raise_to<'a>(&self, target: &'a mut String) -> Self::Output<'a> {
        let old_end = target.len();
        target.push_str(self);
        &target[old_end..]
    }
}