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  1. JDK
  2. JDK-8269802

javac fails to compile nested pattern matching switches

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 17
    • Fix Version/s: 17
    • Component/s: tools
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b31

      Backports

        Description

        Consider the following code:
        ---
        public class T {
            void t() {
               Object o = null;
                switch (o) {
                    default -> {
                        switch (o) {
                            case String s -> System.out.println(s);
                            default -> {}
                        }
                    }
                }
            }
        }
        ---

        This fails to compile:
        ---
        $ javac --enable-preview -source 17 T.java
        Note: T.java uses preview features of Java SE 17.
        Note: Recompile with -Xlint:preview for details.
        An exception has occurred in the compiler (17-internal). 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.check(Assert.java:46)
                at jdk.compiler/com.sun.tools.javac.jvm.Gen.handleSwitch(Gen.java:1310)
                at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitSwitch(Gen.java:1193)
                at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCSwitch.accept(JCTree.java:1294)
        ---

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                Assignee:
                jlahoda Jan Lahoda
                Reporter:
                jlahoda Jan Lahoda
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                  Dates

                  Created:
                  Updated:
                  Resolved: