I want to remove ‘dead’ code and unnecessary exports out of modules. I tried sourceGraph with  sourceGraph tbGlasDll.hs and I  got:

Could not parse source file ./Toetsing.hs

Could not parse source file ./TestGlas.hs

Could not parse source file ./TBGlasDll.hs

Could not parse source file ./Glas.hs

Could not parse source file ./CalcGlas.hs

Could not parse source file ./calc.hs

Could not parse source file ./BelastingFactoren.hs

sourceGraph: Map.findMin: empty map has no minimal element

The files above compile without errors with ghc.

Maybe it has to do with Template Haskell code? Is there an alternative to sourceGraph?

Kees