public override Block VisitBlock(Block block)
{
if (block == null) return null;
Block dup = (Block)this.DuplicateFor[block.UniqueKey];
if (dup != null) return dup;
this.DuplicateFor[block.UniqueKey] = dup = (Block)block.Clone();
return base.VisitBlock(dup);
}
// we don't want to duplicate below blocks.
public override Block VisitBlock(Block block) {
block = (Block)(block.Clone());
block.Statements = this.VisitStatementList(block.Statements);
return block;
}
