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    use crate::core::source::MaybePackage;
    use crate::core::{Dependency, Package, PackageId, QueryKind, Source, SourceId, Summary};
    use crate::util::errors::CargoResult;
    use std::task::Poll;

    use anyhow::Context as _;

    /// A source that replaces one source with the other. This manages the [source
    /// replacement] feature.
    ///
    /// The implementation is merely redirecting from the original to the replacement.
    ///
    /// [source replacement]: https://doc.rust-lang.org/nightly/cargo/reference/source-replacement.html
    pub struct ReplacedSource<'cfg> {
        /// The identifier of the original source.
        to_replace: SourceId,
        /// The identifier of the new replacement source.
        replace_with: SourceId,
        inner: Box<dyn Source + 'cfg>,
    }

    impl<'cfg> ReplacedSource<'cfg> {
        /// Creates a replaced source.
        ///
        /// The `src` argument is the new replacement source.
        pub fn new(
            to_replace: SourceId,
            replace_with: SourceId,
            src: Box<dyn Source + 'cfg>,
        ) -> ReplacedSource<'cfg> {
            ReplacedSource {
                to_replace,
                replace_with,
                inner: src,
            }
        }
    }

    impl<'cfg> Source for ReplacedSource<'cfg> {
        fn source_id(&self) -> SourceId {
            self.to_replace
        }

        fn replaced_source_id(&self) -> SourceId {
            self.replace_with
        }

        fn supports_checksums(&self) -> bool {
            self.inner.supports_checksums()
        }

        fn requires_precise(&self) -> bool {
            self.inner.requires_precise()
        }

        fn query(
            &mut self,
            dep: &Dependency,
            kind: QueryKind,
            f: &mut dyn FnMut(Summary),
        ) -> Poll<CargoResult<()>> {
            let (replace_with, to_replace) = (self.replace_with, self.to_replace);
            let dep = dep.clone().map_source(to_replace, replace_with);

            self.inner
                .query(&dep, kind, &mut |summary| {
                    f(summary.map_source(replace_with, to_replace))
                })
                .map_err(|e| {
                    e.context(format!(
                        "failed to query replaced source {}",
                        self.to_replace
                    ))
                })
        }

        fn invalidate_cache(&mut self) {
            self.inner.invalidate_cache()
        }

        fn set_quiet(&mut self, quiet: bool) {
            self.inner.set_quiet(quiet);
        }

        fn download(&mut self, id: PackageId) -> CargoResult<MaybePackage> {
            let id = id.with_source_id(self.replace_with);
            let pkg = self
                .inner
                .download(id)
                .with_context(|| format!("failed to download replaced source {}", self.to_replace))?;
            Ok(match pkg {
                MaybePackage::Ready(pkg) => {
                    MaybePackage::Ready(pkg.map_source(self.replace_with, self.to_replace))
                }
                other @ MaybePackage::Download { .. } => other,
            })
        }

        fn finish_download(&mut self, id: PackageId, data: Vec<u8>) -> CargoResult<Package> {
            let id = id.with_source_id(self.replace_with);
            let pkg = self
                .inner
                .finish_download(id, data)
                .with_context(|| format!("failed to download replaced source {}", self.to_replace))?;
            Ok(pkg.map_source(self.replace_with, self.to_replace))
        }

        fn fingerprint(&self, id: &Package) -> CargoResult<String> {
            self.inner.fingerprint(id)
        }

        fn verify(&self, id: PackageId) -> CargoResult<()> {
            let id = id.with_source_id(self.replace_with);
            self.inner.verify(id)
        }

        fn describe(&self) -> String {
            if self.replace_with.is_crates_io() && self.to_replace.is_crates_io() {
                // Built-in source replacement of crates.io for sparse registry or tests
                // doesn't need duplicate description (crates.io replacing crates.io).
                self.inner.describe()
            } else {
                format!(
                    "{} (which is replacing {})",
                    self.inner.describe(),
                    self.to_replace
                )
            }
        }

        fn is_replaced(&self) -> bool {
            true
        }

        fn add_to_yanked_whitelist(&mut self, pkgs: &[PackageId]) {
            let pkgs = pkgs
                .iter()
                .map(|id| id.with_source_id(self.replace_with))
                .collect::<Vec<_>>();
            self.inner.add_to_yanked_whitelist(&pkgs);
        }

        fn is_yanked(&mut self, pkg: PackageId) -> Poll<CargoResult<bool>> {
            self.inner.is_yanked(pkg)
        }

        fn block_until_ready(&mut self) -> CargoResult<()> {
            self.inner
                .block_until_ready()
                .with_context(|| format!("failed to update replaced source {}", self.to_replace))
        }
    }