github.com/authcall/reference-optimistic-geth@v0.0.0-20220816224302-06313bfeb8d2/cmd/evm/testdata/4/readme.md (about)

     1  These files examplify a transition where a transaction (excuted on block 5) requests
     2  the blockhash for block `4`, but where the hash for that block is missing. 
     3  It's expected that executing these should cause `exit` with errorcode `4`.