TypeElementImpl.getEnclosingElement() does not return package element for top-level types

[raner]

The javadoc for javax.lang.model.element.TypeElement.getEnclosingElement() states that the method returns "the package of a top-level type, the immediately lexically enclosing element for a nested type."
However, when calling the method on a java-types TypeElement for a top-level type, an exception is thrown:

java.lang.UnsupportedOperationException: getEnclosingElement() not supported for top-level classes.
	at net.florianschoppmann.java.reflect.TypeElementImpl.getEnclosingElement(TypeElementImpl.java:119)
	at net.florianschoppmann.java.reflect.TypeElementImpl.getEnclosingElement(TypeElementImpl.java:16)

[ahange]

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