Please allow search for executable names.
First time me hearing about hpack-dhall-cabal and there is no such package: https://hackage.haskell.org/package/hpack-dhall-cabal.
SOURCE: haskell/cabal#9984 (comment)
No results found for https://hackage.haskell.org/packages/search?terms=hpack-dhall-cabal
In this instance, this is an executable in the hpack-dhall package.
...
name: hpack-dhall
...
executable dhall-hpack-cabal
...
Please allow search for executable names.
No results found for https://hackage.haskell.org/packages/search?terms=hpack-dhall-cabal
In this instance, this is an executable in the hpack-dhall package.