ADDITIONAL SYSTEM INFORMATION :
openjdk 17-ea 2021-09-14
OpenJDK Runtime Environment (build 17-ea+27-2476)
OpenJDK 64-Bit Server VM (build 17-ea+27-2476, mixed mode, sharing)


A DESCRIPTION OF THE PROBLEM :
Currently, it is not compiling source code with "switch(null)" and with `--enable-preview --release 17`

ACTUAL -
An exception has occurred in the compiler (17-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: unexpected type: <nulltype>
        at jdk.compiler/com.sun.tools.javac.tree.TreeMaker.Type(TreeMaker.java:860)
        at jdk.compiler/com.sun.tools.javac.tree.TreeMaker.VarDef(TreeMaker.java:882)
        at jdk.compiler/com.sun.tools.javac.comp.TransPatterns.handleSwitch(TransPatterns.java:383)
        at jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitSwitchExpression(TransPatterns.java:263)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCSwitchExpression.accept(JCTree.java:1380)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitVarDef(TransPatterns.java:729)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:1027)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitBlock(TransPatterns.java:684)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1091)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:150)
        at jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitMethodDef(TransPatterns.java:631)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:921)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:139)
        at jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitClassDef(TransPatterns.java:711)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:819)
        at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at jdk.compiler/com.sun.tools.javac.comp.TransPatterns.translateTopLevelClass(TransPatterns.java:740)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1535)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1408)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:946)
        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)


---------- BEGIN SOURCE ----------
public class Foo{
        public static void main(String[] args){
                switch (null){default:}
        }
}
---------- END SOURCE ----------

FREQUENCY : always