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    use crate::util::{CargoResult, IntoUrl};

    use url::Url;

    /// A type that can be interpreted as a relative Url and converted to
    /// a Url.
    pub trait IntoUrlWithBase {
        /// Performs the conversion
        fn into_url_with_base<U: IntoUrl>(self, base: Option<U>) -> CargoResult<Url>;
    }

    impl<'a> IntoUrlWithBase for &'a str {
        fn into_url_with_base<U: IntoUrl>(self, base: Option<U>) -> CargoResult<Url> {
            let base_url = match base {
                Some(base) => Some(
                    base.into_url()
                        .map_err(|s| anyhow::format_err!("invalid url `{}`: {}", self, s))?,
                ),
                None => None,
            };

            Url::options()
                .base_url(base_url.as_ref())
                .parse(self)
                .map_err(|s| anyhow::format_err!("invalid url `{}`: {}", self, s))
        }
    }

    #[cfg(test)]
    mod tests {
        use crate::util::IntoUrlWithBase;

        #[test]
        fn into_url_with_base() {
            assert_eq!(
                "rel/path"
                    .into_url_with_base(Some("file:///abs/path/"))
                    .unwrap()
                    .to_string(),
                "file:///abs/path/rel/path"
            );
            assert_eq!(
                "rel/path"
                    .into_url_with_base(Some("file:///abs/path/popped-file"))
                    .unwrap()
                    .to_string(),
                "file:///abs/path/rel/path"
            );
        }
    }