Motivation

I was just trying to build basement with GHC head (8.9). I got this error message:

Basement/Block/Base.hs:398:9: error:
    Not in scope: ‘fail’
    Perhaps you meant ‘Data.List.tail’ (imported from Data.List)
    |
398 |         arr@(Block arrBa) <- makeTrampoline
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

For those already in the know, it's pretty easy to discern the meaning of this. But for those who aren't, this message is nonsense.