@Override
  public void accept(ISpecVisitor visitor) throws Exception {
    visitor.visitAnyBlock(this);
    visitor.visitAnonymousBlock(this);
  }
A block without a label at the beginning of a method. Every Method
has a (possibly empty) AnonymousBlock as its first block.

@author Peter Niederwieser
spock-core/src/main/java/org/spockframework/compiler/model/AnonymousBlock.java