My colleague Chris Povirk discovered that the following program causes javac to crash when -Xdoclint is enabled:

$ cat LinkAnno.java
/** {@link #equals(@Deprecated Object)} */
class LinkAnno {
}

$ javac -fullversion -Xdoclint LinkAnno.java
javac full version "16-ea+34-2216"
An exception has occurred in the compiler (16-ea). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program, the following diagnostic, and the parameters passed to the Java compiler in your report. Thank you.
java.lang.AssertionError
        at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155)
        at jdk.compiler/com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:62)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.fromAnnotations(Annotate.java:167)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.lambda$annotateTypeSecondStage$5(Annotate.java:1046)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.flush(Annotate.java:194)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:5056)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attrib(Attr.java:5002)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1344)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:973)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)