void accept(SpecClassFileVisitor visitor) {
    ReflectionUtil.invokeMethod(reader, acceptMethod, visitor, acceptMethodSecondArg);
  }
Wrapper for org.objectweb.asm.ClassReader that works with ASM 2.2.3, 3.0, 3.1, and 3.2.
spock-core/src/main/java/org/spockframework/buildsupport/AsmClassReader.java