Original discussion in raphw/byte-buddy#1732
ByteBuddy sporadically runs into an "impossible" exception in net.bytebuddy.dynamic.scaffold.TypeWriter.Default.ValidatingClassVisitor.visitField.
This code path can happen just with switch statement skipping all branches including default.
In general this condition is rare, but running org.example.App with -Xcomp reliably reproduces this condition on Java 18-23.
Exception in thread "main" java.lang.IllegalStateException: Field POOL_NORMAL defines an incompatible default value 0 at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ValidatingClassVisitor.visitField(TypeWriter.java:2535) at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForInlining$WithFullProcessing$RedefinitionClassVisitor.onVisitField(TypeWriter.java:5164) at net.bytebuddy.utility.visitor.MetadataAwareClassVisitor.visitField(MetadataAwareClassVisitor.java:278) at net.bytebuddy.jar.asm.ClassVisitor.visitField(ClassVisitor.java:356) at net.bytebuddy.jar.asm.commons.ClassRemapper.visitField(ClassRemapper.java:169) at net.bytebuddy.jar.asm.ClassReader.readField(ClassReader.java:1138) at net.bytebuddy.jar.asm.ClassReader.accept(ClassReader.java:740) at net.bytebuddy.utility.AsmClassReader$Default.accept(AsmClassReader.java:132) at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForInlining.create(TypeWriter.java:4039) at net.bytebuddy.dynamic.scaffold.TypeWriter$Default.make(TypeWriter.java:2246) at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase$UsingTypeWriter.make(DynamicType.java:4085) at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase.make(DynamicType.java:3769) at org.example.App.main(App.java:20)