Another weird haddock failure in the Stackage Nightly build (which I could not reproduce locally:
Preprocessing library stm-conduit-2.6.1...
Warning: The documentation for the following packages are not installed. No
links will be generated to these packages: nats-1.1,
transformers-compat-0.4.0.4
target ‘conduits concurrently.’ is not a module name or a source file
‘conduits concurrently.’ comes from the Synopsis!