src/java.compiler/share/classes/javax/lang/model/util/Elements.java

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      /**
       * Returns the package of an element.  The package of a package is
       * itself.
+      * The package of a module is {@code null}.
       *
       * @param type the element being examined
       * @return the package of an element
       */
      PackageElement getPackageOf(Element type);