use crate::borrowed;use bstr::{BStr, ByteSlice}; pub struct ExtraHeaders<I> {    inner: I,} impl<'a, I> ExtraHeaders<I>where    I: Iterator<Item = (&'a BStr, &'a BStr)>,{    pub fn new(iter: I) -> Self {        ExtraHeaders { inner: iter }    }    pub fn find(mut self, name: &str) -> Option<&'a BStr> {        self.inner            .find_map(move |(k, v)| if k == name.as_bytes().as_bstr() { Some(v) } else { None })    }    pub fn find_all(self, name: &'a str) -> impl Iterator<Item = &'a BStr> {        self.inner            .filter_map(move |(k, v)| if k == name.as_bytes().as_bstr() { Some(v) } else { None })    }    pub fn mergetags(self) -> impl Iterator<Item = Result<borrowed::Tag<'a>, borrowed::Error>> {        self.find_all("mergetag").map(|b| borrowed::Tag::from_bytes(b))    }    pub fn pgp_signature(self) -> Option<&'a BStr> {        self.find("gpgsig")    }}