Ch 4: Cannot unify Data.Vector.Vector with Data.Vector.Generic.Base.Vector about liquidhaskell-tutorial

[ranjitjhala]

Hi @mpdairy ,

sorry, this is because of some unfortunate name resolution issues
we've had with the GHC API -- specifically in the alias

{-@ type VectorN a N = {v:Vector a  | vlen v == N} @-}

the name Vector is resolving to the "wrong" thing.

There are two possible fixes.

1. Use the qualified name V.Vector in the alias, i.e. make it:

{-@ type VectorN a N = {v : V.Vector a  | vlen v == N} @-}

2. Better still, replace the name with a hole and let LH+GHC automatically fill it in:

{-@ type VectorN a N = {v : _  | vlen v == N} @-}

Either of those should work, can you confirm?

Thanks!

[mpdairy]

Thanks, both of those options worked!