use std::{borrow::Cow, fmt::Display}; use bstr::BString; use crate::parse::Comment; impl Comment<'_> {    /// Turn this instance into a fully owned one with `'static` lifetime.    #[must_use]    pub fn to_owned(&self) -> Comment<'static> {        Comment {            tag: self.tag,            text: Cow::Owned(self.text.as_ref().into()),        }    }     /// Serialize this type into a `BString` for convenience.    ///    /// Note that `to_string()` can also be used, but might not be lossless.    #[must_use]    pub fn to_bstring(&self) -> BString {        let mut buf = Vec::new();        self.write_to(&mut buf).expect("io error impossible");        buf.into()    }     /// Stream ourselves to the given `out`, in order to reproduce this comment losslessly.    pub fn write_to(&self, mut out: impl std::io::Write) -> std::io::Result<()> {        out.write_all(&[self.tag])?;        out.write_all(self.text.as_ref())    }} impl Display for Comment<'_> {    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {        Display::fmt(&self.to_bstring(), f)    }} impl From<Comment<'_>> for BString {    fn from(c: Comment<'_>) -> Self {        c.into()    }} impl From<&Comment<'_>> for BString {    fn from(c: &Comment<'_>) -> Self {        c.to_bstring()    }}