Using alex/happy with Cabal

Question

I\'m writing a compiler for a class I\'m taking. The class isn\'t specifically Haskell but I\'m using Haskell to write my compiler and interpreter. I have a cabal package setup

Answer 1

For Warren Harris and others like him (and myself) that may come along later, other-modules needs to be set to a list of module names that (I guess?) are expected to be built by the tools listed in build-tools.

So, in my case, the relevant sections of my .cabal file ended up looking like this:

build-tools:         alex, happy
other-modules:       Language.Heidi.Parser,
                     Language.Heidi.Lexer

Answer 2

Apparently what I was missing was actually the Other-modules: field. Once this was added, cabal happily (pardon the pun) built my interpreter.