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    use std::collections::{BTreeMap, HashMap};
    use std::fmt;
    use std::hash::{Hash, Hasher};
    use std::path::{Path, PathBuf};
    use std::rc::Rc;
    use std::sync::Arc;

    use anyhow::Context as _;
    use cargo_util_schemas::manifest::RustVersion;
    use cargo_util_schemas::manifest::{TomlManifest, TomlProfiles};
    use semver::Version;
    use serde::ser;
    use serde::Serialize;
    use url::Url;

    use crate::core::compiler::rustdoc::RustdocScrapeExamples;
    use crate::core::compiler::{CompileKind, CrateType};
    use crate::core::resolver::ResolveBehavior;
    use crate::core::{Dependency, PackageId, PackageIdSpec, SourceId, Summary};
    use crate::core::{Edition, Feature, Features, WorkspaceConfig};
    use crate::util::errors::*;
    use crate::util::interning::InternedString;
    use crate::util::{short_hash, Config, Filesystem};

    pub enum EitherManifest {
        Real(Manifest),
        Virtual(VirtualManifest),
    }

    impl EitherManifest {
        pub(crate) fn workspace_config(&self) -> &WorkspaceConfig {
            match *self {
                EitherManifest::Real(ref r) => r.workspace_config(),
                EitherManifest::Virtual(ref v) => v.workspace_config(),
            }
        }
    }

    /// Contains all the information about a package, as loaded from a `Cargo.toml`.
    ///
    /// This is deserialized using the [`TomlManifest`] type.
    #[derive(Clone, Debug)]
    pub struct Manifest {
        summary: Summary,
        targets: Vec<Target>,
        default_kind: Option<CompileKind>,
        forced_kind: Option<CompileKind>,
        links: Option<String>,
        warnings: Warnings,
        exclude: Vec<String>,
        include: Vec<String>,
        metadata: ManifestMetadata,
        custom_metadata: Option<toml::Value>,
        profiles: Option<TomlProfiles>,
        publish: Option<Vec<String>>,
        replace: Vec<(PackageIdSpec, Dependency)>,
        patch: HashMap<Url, Vec<Dependency>>,
        workspace: WorkspaceConfig,
        original: Rc<TomlManifest>,
        unstable_features: Features,
        edition: Edition,
        rust_version: Option<RustVersion>,
        im_a_teapot: Option<bool>,
        default_run: Option<String>,
        metabuild: Option<Vec<String>>,
        resolve_behavior: Option<ResolveBehavior>,
        lint_rustflags: Vec<String>,
        embedded: bool,
    }

    /// When parsing `Cargo.toml`, some warnings should silenced
    /// if the manifest comes from a dependency. `ManifestWarning`
    /// allows this delayed emission of warnings.
    #[derive(Clone, Debug)]
    pub struct DelayedWarning {
        pub message: String,
        pub is_critical: bool,
    }

    #[derive(Clone, Debug)]
    pub struct Warnings(Vec<DelayedWarning>);

    #[derive(Clone, Debug)]
    pub struct VirtualManifest {
        replace: Vec<(PackageIdSpec, Dependency)>,
        patch: HashMap<Url, Vec<Dependency>>,
        workspace: WorkspaceConfig,
        profiles: Option<TomlProfiles>,
        warnings: Warnings,
        features: Features,
        resolve_behavior: Option<ResolveBehavior>,
    }

    /// General metadata about a package which is just blindly uploaded to the
    /// registry.
    ///
    /// Note that many of these fields can contain invalid values such as the
    /// homepage, repository, documentation, or license. These fields are not
    /// validated by cargo itself, but rather it is up to the registry when uploaded
    /// to validate these fields. Cargo will itself accept any valid TOML
    /// specification for these values.
    #[derive(PartialEq, Clone, Debug)]
    pub struct ManifestMetadata {
        pub authors: Vec<String>,
        pub keywords: Vec<String>,
        pub categories: Vec<String>,
        pub license: Option<String>,
        pub license_file: Option<String>,
        pub description: Option<String>,   // Not in Markdown
        pub readme: Option<String>,        // File, not contents
        pub homepage: Option<String>,      // URL
        pub repository: Option<String>,    // URL
        pub documentation: Option<String>, // URL
        pub badges: BTreeMap<String, BTreeMap<String, String>>,
        pub links: Option<String>,
        pub rust_version: Option<RustVersion>,
    }

    #[derive(Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
    pub enum TargetKind {
        Lib(Vec<CrateType>),
        Bin,
        Test,
        Bench,
        ExampleLib(Vec<CrateType>),
        ExampleBin,
        CustomBuild,
    }

    impl ser::Serialize for TargetKind {
        fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error>
        where
            S: ser::Serializer,
        {
            use self::TargetKind::*;
            match self {
                Lib(kinds) => s.collect_seq(kinds.iter().map(|t| t.to_string())),
                Bin => ["bin"].serialize(s),
                ExampleBin | ExampleLib(_) => ["example"].serialize(s),
                Test => ["test"].serialize(s),
                CustomBuild => ["custom-build"].serialize(s),
                Bench => ["bench"].serialize(s),
            }
        }
    }

    impl fmt::Debug for TargetKind {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            use self::TargetKind::*;
            match *self {
                Lib(ref kinds) => kinds.fmt(f),
                Bin => "bin".fmt(f),
                ExampleBin | ExampleLib(_) => "example".fmt(f),
                Test => "test".fmt(f),
                CustomBuild => "custom-build".fmt(f),
                Bench => "bench".fmt(f),
            }
        }
    }

    impl TargetKind {
        pub fn description(&self) -> &'static str {
            match self {
                TargetKind::Lib(..) => "lib",
                TargetKind::Bin => "bin",
                TargetKind::Test => "integration-test",
                TargetKind::ExampleBin | TargetKind::ExampleLib(..) => "example",
                TargetKind::Bench => "bench",
                TargetKind::CustomBuild => "build-script",
            }
        }

        /// Returns whether production of this artifact requires the object files
        /// from dependencies to be available.
        ///
        /// This only returns `false` when all we're producing is an rlib, otherwise
        /// it will return `true`.
        pub fn requires_upstream_objects(&self) -> bool {
            match self {
                TargetKind::Lib(kinds) | TargetKind::ExampleLib(kinds) => {
                    kinds.iter().any(|k| k.requires_upstream_objects())
                }
                _ => true,
            }
        }

        /// Returns the arguments suitable for `--crate-type` to pass to rustc.
        pub fn rustc_crate_types(&self) -> Vec<CrateType> {
            match self {
                TargetKind::Lib(kinds) | TargetKind::ExampleLib(kinds) => kinds.clone(),
                TargetKind::CustomBuild
                | TargetKind::Bench
                | TargetKind::Test
                | TargetKind::ExampleBin
                | TargetKind::Bin => vec![CrateType::Bin],
            }
        }
    }

    /// Information about a binary, a library, an example, etc. that is part of the
    /// package.
    #[derive(Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
    pub struct Target {
        inner: Arc<TargetInner>,
    }

    #[derive(Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
    struct TargetInner {
        kind: TargetKind,
        name: String,
        // Note that `bin_name` is used for the cargo-feature `different_binary_name`
        bin_name: Option<String>,
        // Note that the `src_path` here is excluded from the `Hash` implementation
        // as it's absolute currently and is otherwise a little too brittle for
        // causing rebuilds. Instead the hash for the path that we send to the
        // compiler is handled elsewhere.
        src_path: TargetSourcePath,
        required_features: Option<Vec<String>>,
        tested: bool,
        benched: bool,
        doc: bool,
        doctest: bool,
        harness: bool, // whether to use the test harness (--test)
        for_host: bool,
        proc_macro: bool,
        edition: Edition,
        doc_scrape_examples: RustdocScrapeExamples,
    }

    #[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
    pub enum TargetSourcePath {
        Path(PathBuf),
        Metabuild,
    }

    impl TargetSourcePath {
        pub fn path(&self) -> Option<&Path> {
            match self {
                TargetSourcePath::Path(path) => Some(path.as_ref()),
                TargetSourcePath::Metabuild => None,
            }
        }

        pub fn is_path(&self) -> bool {
            matches!(self, TargetSourcePath::Path(_))
        }
    }

    impl Hash for TargetSourcePath {
        fn hash<H: Hasher>(&self, _: &mut H) {
            // ...
        }
    }

    impl fmt::Debug for TargetSourcePath {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            match self {
                TargetSourcePath::Path(path) => path.fmt(f),
                TargetSourcePath::Metabuild => "metabuild".fmt(f),
            }
        }
    }

    impl From<PathBuf> for TargetSourcePath {
        fn from(path: PathBuf) -> Self {
            assert!(path.is_absolute(), "`{}` is not absolute", path.display());
            TargetSourcePath::Path(path)
        }
    }

    #[derive(Serialize)]
    struct SerializedTarget<'a> {
        /// Is this a `--bin bin`, `--lib`, `--example ex`?
        /// Serialized as a list of strings for historical reasons.
        kind: &'a TargetKind,
        /// Corresponds to `--crate-type` compiler attribute.
        /// See <https://doc.rust-lang.org/reference/linkage.html>
        crate_types: Vec<CrateType>,
        name: &'a str,
        src_path: Option<&'a PathBuf>,
        edition: &'a str,
        #[serde(rename = "required-features", skip_serializing_if = "Option::is_none")]
        required_features: Option<Vec<&'a str>>,
        /// Whether docs should be built for the target via `cargo doc`
        /// See <https://doc.rust-lang.org/cargo/commands/cargo-doc.html#target-selection>
        doc: bool,
        doctest: bool,
        /// Whether tests should be run for the target (`test` field in `Cargo.toml`)
        test: bool,
    }

    impl ser::Serialize for Target {
        fn serialize<S: ser::Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
            let src_path = match self.src_path() {
                TargetSourcePath::Path(p) => Some(p),
                // Unfortunately getting the correct path would require access to
                // target_dir, which is not available here.
                TargetSourcePath::Metabuild => None,
            };
            SerializedTarget {
                kind: self.kind(),
                crate_types: self.rustc_crate_types(),
                name: self.name(),
                src_path,
                edition: &self.edition().to_string(),
                required_features: self
                    .required_features()
                    .map(|rf| rf.iter().map(|s| s.as_str()).collect()),
                doc: self.documented(),
                doctest: self.doctested() && self.doctestable(),
                test: self.tested(),
            }
            .serialize(s)
        }
    }

    impl fmt::Debug for Target {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            self.inner.fmt(f)
        }
    }

    compact_debug! {
        impl fmt::Debug for TargetInner {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                let (default, default_name) = {
                    match &self.kind {
                        TargetKind::Lib(kinds) => {
                            (
                                Target::lib_target(
                                    &self.name,
                                    kinds.clone(),
                                    self.src_path.path().unwrap().to_path_buf(),
                                    self.edition,
                                ).inner,
                                format!("lib_target({:?}, {:?}, {:?}, {:?})",
                                        self.name, kinds, self.src_path, self.edition),
                            )
                        }
                        TargetKind::CustomBuild => {
                            match self.src_path {
                                TargetSourcePath::Path(ref path) => {
                                    (
                                        Target::custom_build_target(
                                            &self.name,
                                            path.to_path_buf(),
                                            self.edition,
                                        ).inner,
                                        format!("custom_build_target({:?}, {:?}, {:?})",
                                                self.name, path, self.edition),
                                    )
                                }
                                TargetSourcePath::Metabuild => {
                                    (
                                        Target::metabuild_target(&self.name).inner,
                                        format!("metabuild_target({:?})", self.name),
                                    )
                                }
                            }
                        }
                        _ => (
                            Target::new(self.src_path.clone(), self.edition).inner,
                            format!("with_path({:?}, {:?})", self.src_path, self.edition),
                        ),
                    }
                };
                [debug_the_fields(
                    kind
                    name
                    bin_name
                    src_path
                    required_features
                    tested
                    benched
                    doc
                    doctest
                    harness
                    for_host
                    proc_macro
                    edition
                    doc_scrape_examples
                )]
            }
        }
    }

    impl Manifest {
        pub fn new(
            summary: Summary,
            default_kind: Option<CompileKind>,
            forced_kind: Option<CompileKind>,
            targets: Vec<Target>,
            exclude: Vec<String>,
            include: Vec<String>,
            links: Option<String>,
            metadata: ManifestMetadata,
            custom_metadata: Option<toml::Value>,
            profiles: Option<TomlProfiles>,
            publish: Option<Vec<String>>,
            replace: Vec<(PackageIdSpec, Dependency)>,
            patch: HashMap<Url, Vec<Dependency>>,
            workspace: WorkspaceConfig,
            unstable_features: Features,
            edition: Edition,
            rust_version: Option<RustVersion>,
            im_a_teapot: Option<bool>,
            default_run: Option<String>,
            original: Rc<TomlManifest>,
            metabuild: Option<Vec<String>>,
            resolve_behavior: Option<ResolveBehavior>,
            lint_rustflags: Vec<String>,
            embedded: bool,
        ) -> Manifest {
            Manifest {
                summary,
                default_kind,
                forced_kind,
                targets,
                warnings: Warnings::new(),
                exclude,
                include,
                links,
                metadata,
                custom_metadata,
                profiles,
                publish,
                replace,
                patch,
                workspace,
                unstable_features,
                edition,
                rust_version,
                original,
                im_a_teapot,
                default_run,
                metabuild,
                resolve_behavior,
                lint_rustflags,
                embedded,
            }
        }

        pub fn dependencies(&self) -> &[Dependency] {
            self.summary.dependencies()
        }
        pub fn default_kind(&self) -> Option<CompileKind> {
            self.default_kind
        }
        pub fn forced_kind(&self) -> Option<CompileKind> {
            self.forced_kind
        }
        pub fn exclude(&self) -> &[String] {
            &self.exclude
        }
        pub fn include(&self) -> &[String] {
            &self.include
        }
        pub fn metadata(&self) -> &ManifestMetadata {
            &self.metadata
        }
        pub fn name(&self) -> InternedString {
            self.package_id().name()
        }
        pub fn package_id(&self) -> PackageId {
            self.summary.package_id()
        }
        pub fn summary(&self) -> &Summary {
            &self.summary
        }
        pub fn summary_mut(&mut self) -> &mut Summary {
            &mut self.summary
        }
        pub fn targets(&self) -> &[Target] {
            &self.targets
        }
        // It is used by cargo-c, please do not remove it
        pub fn targets_mut(&mut self) -> &mut [Target] {
            &mut self.targets
        }
        pub fn version(&self) -> &Version {
            self.package_id().version()
        }
        pub fn warnings_mut(&mut self) -> &mut Warnings {
            &mut self.warnings
        }
        pub fn warnings(&self) -> &Warnings {
            &self.warnings
        }
        pub fn profiles(&self) -> Option<&TomlProfiles> {
            self.profiles.as_ref()
        }
        pub fn publish(&self) -> &Option<Vec<String>> {
            &self.publish
        }
        pub fn replace(&self) -> &[(PackageIdSpec, Dependency)] {
            &self.replace
        }
        pub fn original(&self) -> &TomlManifest {
            &self.original
        }
        pub fn patch(&self) -> &HashMap<Url, Vec<Dependency>> {
            &self.patch
        }
        pub fn links(&self) -> Option<&str> {
            self.links.as_deref()
        }
        pub fn is_embedded(&self) -> bool {
            self.embedded
        }

        pub fn workspace_config(&self) -> &WorkspaceConfig {
            &self.workspace
        }

        /// Unstable, nightly features that are enabled in this manifest.
        pub fn unstable_features(&self) -> &Features {
            &self.unstable_features
        }

        /// The style of resolver behavior to use, declared with the `resolver` field.
        ///
        /// Returns `None` if it is not specified.
        pub fn resolve_behavior(&self) -> Option<ResolveBehavior> {
            self.resolve_behavior
        }

        /// `RUSTFLAGS` from the `[lints]` table
        pub fn lint_rustflags(&self) -> &[String] {
            self.lint_rustflags.as_slice()
        }

        pub fn map_source(self, to_replace: SourceId, replace_with: SourceId) -> Manifest {
            Manifest {
                summary: self.summary.map_source(to_replace, replace_with),
                ..self
            }
        }

        pub fn feature_gate(&self) -> CargoResult<()> {
            if self.im_a_teapot.is_some() {
                self.unstable_features
                    .require(Feature::test_dummy_unstable())
                    .with_context(|| {
                        "the `im-a-teapot` manifest key is unstable and may \
                         not work properly in England"
                    })?;
            }

            if self.default_kind.is_some() || self.forced_kind.is_some() {
                self.unstable_features
                    .require(Feature::per_package_target())
                    .with_context(|| {
                        "the `package.default-target` and `package.forced-target` \
                         manifest keys are unstable and may not work properly"
                    })?;
            }

            Ok(())
        }

        // Just a helper function to test out `-Z` flags on Cargo
        pub fn print_teapot(&self, config: &Config) {
            if let Some(teapot) = self.im_a_teapot {
                if config.cli_unstable().print_im_a_teapot {
                    crate::drop_println!(config, "im-a-teapot = {}", teapot);
                }
            }
        }

        pub fn edition(&self) -> Edition {
            self.edition
        }

        pub fn rust_version(&self) -> Option<&RustVersion> {
            self.rust_version.as_ref()
        }

        pub fn custom_metadata(&self) -> Option<&toml::Value> {
            self.custom_metadata.as_ref()
        }

        pub fn default_run(&self) -> Option<&str> {
            self.default_run.as_deref()
        }

        pub fn metabuild(&self) -> Option<&Vec<String>> {
            self.metabuild.as_ref()
        }

        pub fn metabuild_path(&self, target_dir: Filesystem) -> PathBuf {
            let hash = short_hash(&self.package_id());
            target_dir
                .into_path_unlocked()
                .join(".metabuild")
                .join(format!("metabuild-{}-{}.rs", self.name(), hash))
        }
    }

    impl VirtualManifest {
        pub fn new(
            replace: Vec<(PackageIdSpec, Dependency)>,
            patch: HashMap<Url, Vec<Dependency>>,
            workspace: WorkspaceConfig,
            profiles: Option<TomlProfiles>,
            features: Features,
            resolve_behavior: Option<ResolveBehavior>,
        ) -> VirtualManifest {
            VirtualManifest {
                replace,
                patch,
                workspace,
                profiles,
                warnings: Warnings::new(),
                features,
                resolve_behavior,
            }
        }

        pub fn replace(&self) -> &[(PackageIdSpec, Dependency)] {
            &self.replace
        }

        pub fn patch(&self) -> &HashMap<Url, Vec<Dependency>> {
            &self.patch
        }

        pub fn workspace_config(&self) -> &WorkspaceConfig {
            &self.workspace
        }

        pub fn profiles(&self) -> Option<&TomlProfiles> {
            self.profiles.as_ref()
        }

        pub fn warnings_mut(&mut self) -> &mut Warnings {
            &mut self.warnings
        }

        pub fn warnings(&self) -> &Warnings {
            &self.warnings
        }

        pub fn unstable_features(&self) -> &Features {
            &self.features
        }

        /// The style of resolver behavior to use, declared with the `resolver` field.
        ///
        /// Returns `None` if it is not specified.
        pub fn resolve_behavior(&self) -> Option<ResolveBehavior> {
            self.resolve_behavior
        }
    }

    impl Target {
        fn new(src_path: TargetSourcePath, edition: Edition) -> Target {
            Target {
                inner: Arc::new(TargetInner {
                    kind: TargetKind::Bin,
                    name: String::new(),
                    bin_name: None,
                    src_path,
                    required_features: None,
                    doc: false,
                    doctest: false,
                    harness: true,
                    for_host: false,
                    proc_macro: false,
                    doc_scrape_examples: RustdocScrapeExamples::Unset,
                    edition,
                    tested: true,
                    benched: true,
                }),
            }
        }

        fn with_path(src_path: PathBuf, edition: Edition) -> Target {
            Target::new(TargetSourcePath::from(src_path), edition)
        }

        pub fn lib_target(
            name: &str,
            crate_targets: Vec<CrateType>,
            src_path: PathBuf,
            edition: Edition,
        ) -> Target {
            let mut target = Target::with_path(src_path, edition);
            target
                .set_kind(TargetKind::Lib(crate_targets))
                .set_name(name)
                .set_doctest(true)
                .set_doc(true);
            target
        }

        pub fn bin_target(
            name: &str,
            bin_name: Option<String>,
            src_path: PathBuf,
            required_features: Option<Vec<String>>,
            edition: Edition,
        ) -> Target {
            let mut target = Target::with_path(src_path, edition);
            target
                .set_kind(TargetKind::Bin)
                .set_name(name)
                .set_binary_name(bin_name)
                .set_required_features(required_features)
                .set_doc(true);
            target
        }

        /// Builds a `Target` corresponding to the `build = "build.rs"` entry.
        pub fn custom_build_target(name: &str, src_path: PathBuf, edition: Edition) -> Target {
            let mut target = Target::with_path(src_path, edition);
            target
                .set_kind(TargetKind::CustomBuild)
                .set_name(name)
                .set_for_host(true)
                .set_benched(false)
                .set_tested(false)
                .set_doc_scrape_examples(RustdocScrapeExamples::Disabled);
            target
        }

        pub fn metabuild_target(name: &str) -> Target {
            let mut target = Target::new(TargetSourcePath::Metabuild, Edition::Edition2018);
            target
                .set_kind(TargetKind::CustomBuild)
                .set_name(name)
                .set_for_host(true)
                .set_benched(false)
                .set_tested(false)
                .set_doc_scrape_examples(RustdocScrapeExamples::Disabled);
            target
        }

        pub fn example_target(
            name: &str,
            crate_targets: Vec<CrateType>,
            src_path: PathBuf,
            required_features: Option<Vec<String>>,
            edition: Edition,
        ) -> Target {
            let kind = if crate_targets.is_empty() || crate_targets.iter().all(|t| *t == CrateType::Bin)
            {
                TargetKind::ExampleBin
            } else {
                TargetKind::ExampleLib(crate_targets)
            };
            let mut target = Target::with_path(src_path, edition);
            target
                .set_kind(kind)
                .set_name(name)
                .set_required_features(required_features)
                .set_tested(false)
                .set_benched(false);
            target
        }

        pub fn test_target(
            name: &str,
            src_path: PathBuf,
            required_features: Option<Vec<String>>,
            edition: Edition,
        ) -> Target {
            let mut target = Target::with_path(src_path, edition);
            target
                .set_kind(TargetKind::Test)
                .set_name(name)
                .set_required_features(required_features)
                .set_benched(false);
            target
        }

        pub fn bench_target(
            name: &str,
            src_path: PathBuf,
            required_features: Option<Vec<String>>,
            edition: Edition,
        ) -> Target {
            let mut target = Target::with_path(src_path, edition);
            target
                .set_kind(TargetKind::Bench)
                .set_name(name)
                .set_required_features(required_features)
                .set_tested(false);
            target
        }

        pub fn name(&self) -> &str {
            &self.inner.name
        }
        pub fn crate_name(&self) -> String {
            self.name().replace("-", "_")
        }
        pub fn src_path(&self) -> &TargetSourcePath {
            &self.inner.src_path
        }
        pub fn set_src_path(&mut self, src_path: TargetSourcePath) {
            Arc::make_mut(&mut self.inner).src_path = src_path;
        }
        pub fn required_features(&self) -> Option<&Vec<String>> {
            self.inner.required_features.as_ref()
        }
        pub fn kind(&self) -> &TargetKind {
            &self.inner.kind
        }
        pub fn tested(&self) -> bool {
            self.inner.tested
        }
        pub fn harness(&self) -> bool {
            self.inner.harness
        }
        pub fn documented(&self) -> bool {
            self.inner.doc
        }
        // A plugin, proc-macro, or build-script.
        pub fn for_host(&self) -> bool {
            self.inner.for_host
        }
        pub fn proc_macro(&self) -> bool {
            self.inner.proc_macro
        }
        pub fn edition(&self) -> Edition {
            self.inner.edition
        }
        pub fn doc_scrape_examples(&self) -> RustdocScrapeExamples {
            self.inner.doc_scrape_examples
        }
        pub fn benched(&self) -> bool {
            self.inner.benched
        }
        pub fn doctested(&self) -> bool {
            self.inner.doctest
        }

        pub fn doctestable(&self) -> bool {
            match self.kind() {
                TargetKind::Lib(ref kinds) => kinds.iter().any(|k| {
                    *k == CrateType::Rlib || *k == CrateType::Lib || *k == CrateType::ProcMacro
                }),
                _ => false,
            }
        }

        pub fn is_lib(&self) -> bool {
            matches!(self.kind(), TargetKind::Lib(_))
        }

        pub fn is_dylib(&self) -> bool {
            match self.kind() {
                TargetKind::Lib(libs) => libs.iter().any(|l| *l == CrateType::Dylib),
                _ => false,
            }
        }

        pub fn is_cdylib(&self) -> bool {
            match self.kind() {
                TargetKind::Lib(libs) => libs.iter().any(|l| *l == CrateType::Cdylib),
                _ => false,
            }
        }

        pub fn is_staticlib(&self) -> bool {
            match self.kind() {
                TargetKind::Lib(libs) => libs.iter().any(|l| *l == CrateType::Staticlib),
                _ => false,
            }
        }

        /// Returns whether this target produces an artifact which can be linked
        /// into a Rust crate.
        ///
        /// This only returns true for certain kinds of libraries.
        pub fn is_linkable(&self) -> bool {
            match self.kind() {
                TargetKind::Lib(kinds) => kinds.iter().any(|k| k.is_linkable()),
                _ => false,
            }
        }

        pub fn is_bin(&self) -> bool {
            *self.kind() == TargetKind::Bin
        }

        pub fn is_example(&self) -> bool {
            matches!(
                self.kind(),
                TargetKind::ExampleBin | TargetKind::ExampleLib(..)
            )
        }

        /// Returns `true` if it is a binary or executable example.
        /// NOTE: Tests are `false`!
        pub fn is_executable(&self) -> bool {
            self.is_bin() || self.is_exe_example()
        }

        /// Returns `true` if it is an executable example.
        pub fn is_exe_example(&self) -> bool {
            // Needed for --all-examples in contexts where only runnable examples make sense
            matches!(self.kind(), TargetKind::ExampleBin)
        }

        pub fn is_test(&self) -> bool {
            *self.kind() == TargetKind::Test
        }
        pub fn is_bench(&self) -> bool {
            *self.kind() == TargetKind::Bench
        }
        pub fn is_custom_build(&self) -> bool {
            *self.kind() == TargetKind::CustomBuild
        }

        /// Returns the arguments suitable for `--crate-type` to pass to rustc.
        pub fn rustc_crate_types(&self) -> Vec<CrateType> {
            self.kind().rustc_crate_types()
        }

        pub fn set_tested(&mut self, tested: bool) -> &mut Target {
            Arc::make_mut(&mut self.inner).tested = tested;
            self
        }
        pub fn set_benched(&mut self, benched: bool) -> &mut Target {
            Arc::make_mut(&mut self.inner).benched = benched;
            self
        }
        pub fn set_doctest(&mut self, doctest: bool) -> &mut Target {
            Arc::make_mut(&mut self.inner).doctest = doctest;
            self
        }
        pub fn set_for_host(&mut self, for_host: bool) -> &mut Target {
            Arc::make_mut(&mut self.inner).for_host = for_host;
            self
        }
        pub fn set_proc_macro(&mut self, proc_macro: bool) -> &mut Target {
            Arc::make_mut(&mut self.inner).proc_macro = proc_macro;
            self
        }
        pub fn set_edition(&mut self, edition: Edition) -> &mut Target {
            Arc::make_mut(&mut self.inner).edition = edition;
            self
        }
        pub fn set_doc_scrape_examples(
            &mut self,
            doc_scrape_examples: RustdocScrapeExamples,
        ) -> &mut Target {
            Arc::make_mut(&mut self.inner).doc_scrape_examples = doc_scrape_examples;
            self
        }
        pub fn set_harness(&mut self, harness: bool) -> &mut Target {
            Arc::make_mut(&mut self.inner).harness = harness;
            self
        }
        pub fn set_doc(&mut self, doc: bool) -> &mut Target {
            Arc::make_mut(&mut self.inner).doc = doc;
            self
        }
        pub fn set_kind(&mut self, kind: TargetKind) -> &mut Target {
            Arc::make_mut(&mut self.inner).kind = kind;
            self
        }
        pub fn set_name(&mut self, name: &str) -> &mut Target {
            Arc::make_mut(&mut self.inner).name = name.to_string();
            self
        }
        pub fn set_binary_name(&mut self, bin_name: Option<String>) -> &mut Target {
            Arc::make_mut(&mut self.inner).bin_name = bin_name;
            self
        }
        pub fn set_required_features(&mut self, required_features: Option<Vec<String>>) -> &mut Target {
            Arc::make_mut(&mut self.inner).required_features = required_features;
            self
        }
        pub fn binary_filename(&self) -> Option<String> {
            self.inner.bin_name.clone()
        }
        pub fn description_named(&self) -> String {
            match self.kind() {
                TargetKind::Lib(..) => "lib".to_string(),
                TargetKind::Bin => format!("bin \"{}\"", self.name()),
                TargetKind::Test => format!("test \"{}\"", self.name()),
                TargetKind::Bench => format!("bench \"{}\"", self.name()),
                TargetKind::ExampleLib(..) | TargetKind::ExampleBin => {
                    format!("example \"{}\"", self.name())
                }
                TargetKind::CustomBuild => "build script".to_string(),
            }
        }
    }

    impl fmt::Display for Target {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            match self.kind() {
                TargetKind::Lib(..) => write!(f, "Target(lib)"),
                TargetKind::Bin => write!(f, "Target(bin: {})", self.name()),
                TargetKind::Test => write!(f, "Target(test: {})", self.name()),
                TargetKind::Bench => write!(f, "Target(bench: {})", self.name()),
                TargetKind::ExampleBin | TargetKind::ExampleLib(..) => {
                    write!(f, "Target(example: {})", self.name())
                }
                TargetKind::CustomBuild => write!(f, "Target(script)"),
            }
        }
    }

    impl Warnings {
        fn new() -> Warnings {
            Warnings(Vec::new())
        }

        pub fn add_warning(&mut self, s: String) {
            self.0.push(DelayedWarning {
                message: s,
                is_critical: false,
            })
        }

        pub fn add_critical_warning(&mut self, s: String) {
            self.0.push(DelayedWarning {
                message: s,
                is_critical: true,
            })
        }

        pub fn warnings(&self) -> &[DelayedWarning] {
            &self.0
        }
    }