public int getBlockMetaDataIndex() {
    return blockMetaDataIndex;
  }
AST node representing a block in a feature method. There are six kinds
of blocks: setup-block, expect-block, when-block, then-block, cleanup-block,
and where-block.

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