NPE in MembersPhase.finishClass

The following ill-formed program crashes javac 9-ea+149 with annotation processing enabled:

=== Test.java ===
@Deprecated enum Test implements Test {}
===

=== Processor.java ===
import java.util.Set;
import javax.annotation.processing.*;
import javax.lang.model.element.TypeElement;

@SupportedAnnotationTypes("*")
public class Processor extends AbstractProcessor {
  @Override
  public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnvironment) {
    return false;
  }
}
===

$ javac Processor.java
$ javac Test.java -processor Processor

java.lang.NullPointerException
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$MembersPhase.finishClass(TypeEnter.java:941)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$MembersPhase.runPhase(TypeEnter.java:929)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$Phase.doCompleteEnvs(TypeEnter.java:270)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$MembersPhase.doCompleteEnvs(TypeEnter.java:864)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:245)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:254)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:254)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:254)
        at jdk.compiler/com.sun.tools.javac.comp.TypeEnter.complete(TypeEnter.java:195)
        at jdk.compiler/com.sun.tools.javac.code.Symbol.complete(Symbol.java:633)
        at jdk.compiler/com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1273)
        at jdk.compiler/com.sun.tools.javac.comp.Enter.complete(Enter.java:569)
        at jdk.compiler/com.sun.tools.javac.comp.Enter.main(Enter.java:546)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:1069)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:940)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:307)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:160)
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:55)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:41)