unexpected type <nulltype> for dummy switch on null

[Brian Goetz]

To be clear, the correct behavior would be to throw an NPE.  If the code 
were slightly different:

     case null, default: ...

then the correct behavior would be to print a blank line.

On 7/19/2021 1:00 PM, Anna Kozlova wrote:
> Hi folks,
> I got an exception when compile dummy code with latest available build 31
> void f() {
>      switch (null) {
>          case default:
>              System.out.println(); }
> }
>
> jjava: java.lang.AssertionError: unexpected type: <nulltype>
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.TreeMaker.Type(TreeMaker.java:860)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.TreeMaker.VarDef(TreeMaker.java:882)
> java: at 
> jdk.compiler/com.sun.tools.javac.comp.TransPatterns.handleSwitch(TransPatterns.java:350)
> java: at 
> jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitSwitch(TransPatterns.java:267)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.JCTree$JCSwitch.accept(JCTree.java:1294)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
> java: at 
> jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitBlock(TransPatterns.java:642)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1091)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:150)
> java: at 
> jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitMethodDef(TransPatterns.java:589)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:921)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:139)
> java: at 
> jdk.compiler/com.sun.tools.javac.comp.TransPatterns.visitClassDef(TransPatterns.java:669)
> java: at 
> jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:819)
> java: at 
> jdk.compiler/com.sun.tools.javac.comp.TransPatterns.translateTopLevelClass(TransPatterns.java:698)
> java: at 
> jdk.compiler/com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1535)
> java: at 
> jdk.compiler/com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1408)
> java: at 
> jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:946)
> java: at 
> jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
> java: at 
> jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)
> java: at 
> jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
> java: at 
> jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
> java: at org.jetbrains.jps.javac.JavacMain.compile(JavacMain.java:238)
>
> Anna

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