openide/plugins/devkit/devkit-java-tests/testData/codeInsight/pluginAttributes.xml

<idea-plugin package="com.intellij"
             <error descr="Implementation plugins are no longer supported: use either a regular plugin or implement a product module">implementation-detail="false"</error>
             allow-bundled-update="false"
             require-restart="false"
             url="https://www.jetbrains.com">
  <id>com.intellij</id>
  <vendor>JetBrains</vendor>
</idea-plugin>