ADDITIONAL SYSTEM INFORMATION :
javac 21.0.8

A DESCRIPTION OF THE PROBLEM :
javac (JDK 21) throws an internal java.lang.AssertionError when compiling following valid code that uses a pattern-matching switch over a sealed interface with record implementations, within a lambda in a stream pipeline.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compiling following code using javac 21:
```
javac App.java
```

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The code should compile successfully.
ACTUAL -
javac throws java.lang.AssertionError:
```
An exception has occurred in the compiler (21.0.8). 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.util.Assert.checkNull(Assert.java:54)
        at jdk.compiler/com.sun.tools.javac.jvm.Code.addLocalVar(Code.java:2005)
        at jdk.compiler/com.sun.tools.javac.jvm.Code.newLocal(Code.java:2221)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitVarDef(Gen.java:1088)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:1022)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:614)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:649)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:635)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:686)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitLetExpr(Gen.java:2439)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$LetExpr.accept(JCTree.java:3418)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:885)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genArgs(Gen.java:910)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1936)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1816)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:885)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitVarDef(Gen.java:1089)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:1022)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:614)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:649)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:635)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:686)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.doVisitBlock(Gen.java:1128)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1121)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1092)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:614)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:649)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:635)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:686)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.doVisitBlock(Gen.java:1128)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1110)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1092)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:614)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:649)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:975)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:938)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:916)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:614)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2482)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:769)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1710)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1678)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:976)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:319)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:178)
        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 ----------
import java.util.*;

sealed interface Result permits Success, Failure {
}

record Success(String msg) implements Result {
    @Override
    public String toString() {
        return "Success: " + msg;
    }
}

record Failure(String err) implements Result {
    @Override
    public String toString() {
        return "Failure: " + err;
    }
}

public class App {
    public static void main(String[] args) {
        List<String> data = List.of("123", "abc", "456", "789");

        data.stream()
                .map(s -> {
                    if (s.matches("\\d+")) {
                        return new Success(s);
                    } else {
                        return new Failure(s);
                    }
                })
                .forEach(r -> System.out.println(
                        switch (r) {
                            case Success(String msg) -> msg;
                            case Failure(String err) -> err;
                            default -> "Unknown result";
                        }));
    }
}
---------- END SOURCE ----------