Hello Café, I've been testing properties of some optimized Core using the inspection-testing library. Some functions appear to be optimized differently depending on whether one of the package dependencies comes from Hackage or elsewhere. As far as I can tell, the source code is identical, and the only difference is whether or not I add the path to the local package in my cabal.project. Why would a dependency be compiled differently depending on where it comes from? Any suggestions on how to troubleshoot this? To be more concrete, the relevant packages are generic-random and splitmix. The following commands should reproduce the issue: git clone https://github.com/Lysxia/generic-random git clone https://github.com/phadej/splitmix cd generic-random # With local splitmix echo "packages: . ../splitmix" > cabal.project cabal test --flags="enable-inspect" # PASS # With remote splitmix echo "packages: ." > cabal.project cabal test --flags="enable-inspect" # FAIL It would be useful to know whether anyone can reproduce this behavior or not. Cheers, Li-yao PS, link to Github issue: https://github.com/Lysxia/generic-random/issues/22