Gem::Ext::CargoBuilder#cargo_crate_name

# File tmp/rubies/ruby-4.0.0/lib/rubygems/ext/cargo_builder.rb, line 202
  def cargo_crate_name(cargo_dir, manifest_path, results)
    require "open3"
    Gem.load_yaml

    output, status =
      begin
        Open3.capture2e(cargo, "metadata", "--no-deps", "--format-version", "1", chdir: cargo_dir)
      rescue StandardError => error
        raise Gem::InstallError, "cargo metadata failed #{error.message}"
      end

    unless status.success?
      if Gem.configuration.really_verbose
        puts output
      else
        results << output
      end

      exit_reason =
        if status.exited?
          ", exit code #{status.exitstatus}"
        elsif status.signaled?
          ", uncaught signal #{status.termsig}"
        end

      raise Gem::InstallError, "cargo metadata failed#{exit_reason}"
    end

    # cargo metadata output is specified as json, but with the
    # --format-version 1 option the output is compatible with YAML, so we can
    # avoid the json dependency
    metadata = Gem::SafeYAML.safe_load(output)
    package = metadata["packages"].find {|pkg| normalize_path(pkg["manifest_path"]) == manifest_path }
    unless package
      found = metadata["packages"].map {|md| "#{md["name"]} at #{md["manifest_path"]}" }
      raise Gem::InstallError, <<-EOF
failed to determine cargo package name

looking for: #{manifest_path}

found:
#{found.join("\n")}
EOF
    end
    package["name"].tr("-", "_")
  end