code: func (b *BlockGen) AddUncheckedReceipt(receipt *types.Receipt) {
  	b.receipts = append(b.receipts, receipt)
  }
docs: // AddUncheckedReceipt forcefully adds a receipts to the block without a
  // backing transaction.
  //
  // AddUncheckedReceipt will cause consensus failures when used during real
  // chain processing. This is best used in conjunction with raw block insertion.