javac crashes with module imports and implicitly declared class

Consider code:
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import module java.sql;

void main() {
System.out.println("Hello!");
}
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Running this fails:
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$ java --enable-preview /tmp/B.java
An exception has occurred in the compiler (23-internal). Please file a bug against the Java compiler via the Java bug reporting page (https://bugreport.java.com) after checking the Bug Database (https://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.tree.TreeScanner.visitTree(TreeScanner.java:415)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$Visitor.visitModuleImport(JCTree.java:3528)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCModuleImport.accept(JCTree.java:720)
        at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions.scan(TypeAnnotations.java:295)
        at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:58)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions.visitClassDef(TypeAnnotations.java:1115)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:855)
        at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:50)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions.scan(TypeAnnotations.java:295)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations.lambda$organizeTypeAnnotationsSignatures$0(TypeAnnotations.java:133)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.flush(Annotate.java:197)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.unblockAnnotations(Annotate.java:144)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:157)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterDone(JavaCompiler.java:1813)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:1079)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:948)
        at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
        at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)
        at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
        at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
        at jdk.compiler/com.sun.tools.javac.launcher.MemoryContext.compileProgram(MemoryContext.java:125)
        at jdk.compiler/com.sun.tools.javac.launcher.SourceLauncher.run(SourceLauncher.java:150)
        at jdk.compiler/com.sun.tools.javac.launcher.SourceLauncher.main(SourceLauncher.java:78)
error: compilation failed
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