use cargo_metadata::{Node, PackageId};
#[derive(Clone, Debug)]
struct CrateMetadata<'metadata> {
    data: &'metadata cargo_metadata::Metadata,
    packages: &'metadata Vec<Node>,
    root: &'metadata PackageId,
}
impl<'metadata> CrateMetadata<'metadata> {
    fn new(metadata: &'metadata cargo_metadata::Metadata) -> Self {
        let resolve = metadata
            .resolve
            .as_ref()
            .expect("Cargo did not resolve dependencies");
        let root = resolve.root.as_ref().expect("Must select a root crate");
        Self {
            data: metadata,
            packages: &resolve.nodes,
            root,
        }
    }
}
fn main() {
    let cmd = cargo_metadata::MetadataCommand::new();
    let metadata = cmd.exec().expect("Cargo did not resolve metadata");
    let root_crate = CrateMetadata::new(&metadata);
    dbg!(root_crate.root);
}

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[dependencies]
cargo_metadata = "0.18.1"

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.git
.DS_Store
# Added by cargo
/target