Does not gernerate documentation with reexported-modules

[recursion-ninja]

Summary

stack does not correctly bundle the Haddock documentation for libraries with a reexported-modules field in the .cabal file.

Steps to reproduce

1. $ git clone https://github.com/amnh/PCG && cd PCG && git checkout 0.2.0
2. $ make clean && stack build --haddock --haddock-deps --haddock-hyperlink-source --haddock-internal pcg-core
3. Open the local documentation file reported by stack in a web browser. The local URI is reported by stack in the following form:

   Updating Haddock index for local packages in
   /home/user/Code/PCG/.stack-work/install/x86_64-linux/<some-very-long-hash>/8.6.5/doc/index.html
   

4. Notice the missing documentation for the following modules:

   Analysis.Clustering
   Analysis.Parsimony.Additive
   Analysis.Parsimony.Dynamic.DirectOptimization
   Analysis.Parsimony.Dynamic.DirectOptimization.Pairwise
   Analysis.Parsimony.Fitch
   Analysis.Parsimony.Sankoff
   Analysis.Scoring
   Analysis.TotalEdgeCost
   Bio.Character
   Bio.Character.Decoration.Additive
   Bio.Character.Decoration.Continuous
   Bio.Character.Decoration.Discrete
   Bio.Character.Decoration.Discrete.Class
   Bio.Character.Decoration.Dynamic
   Bio.Character.Decoration.Fitch
   Bio.Character.Decoration.Metric
   Bio.Character.Decoration.NonMetric
   Bio.Character.Encodable
   Bio.Character.Encodable.Continuous
   Bio.Character.Type
   Bio.Metadata
   Bio.Metadata.CharacterName
   Bio.Metadata.Continuous
   Bio.Metadata.Discrete
   Bio.Metadata.DiscreteWithTCM
   Bio.Metadata.Dynamic
   Bio.Metadata.Metric
   Bio.Sequence
   Bio.Sequence.Block
   Bio.Sequence.Character
   Bio.Sequence.Metadata
   Bio.Graph
   Bio.Graph.Component
   Bio.Graph.Constructions
   Bio.Graph.LeafSet
   Bio.Graph.Node
   Bio.Graph.Node.Context
   Bio.Graph.PhylogeneticDAG
   Bio.Graph.PhylogeneticDAG.Substitute
   Bio.Graph.ReferenceDAG
   Bio.Graph.ReferenceDAG.Internal
   Bio.Graph.ReferenceDAG.Network
   Bio.Graph.ReferenceDAG.Traversal
   Bio.Graph.ReferenceDAG.Utility
   Bio.Graph.Solution
   Bio.Graph.ZipperDAG
   Data.EdgeLength
   Data.MetricRepresentation
   Data.NodeLabel
   Data.TCM
   Data.TCM.Dense
   Data.TopologyRepresentation
   Test.Custom.NucleotideSequence
   

Expected

Documentation from all exported and re-exported modules present in the haddock documentation index.

Actual

Documentation is missing from re-exported modules in the haddock documentation index.

Logs

You can view the output of the following stack invocation on my machine here

$ stack build --haddock --haddock-deps --haddock-hyperlink-source --haddock-internal --verbose pcg-core

Stack version

$ stack --version
Version 2.1.1, Git revision f612ea85316bbc327a64e4ad8d9f0b150dc12d4b (7648 commits) x86_64 hpack-0.31.2

Method of installation

Some method several years ago followed by numerous stack upgrade commands.