
I can provide a test case (the darcs darcs repo) where I have just seen this for the second time. Am 23.03.2017 um 00:43 schrieb Evan Laforge:
I've been seeing this since 6.12. I brought it up 7 (!) years ago, but unfortunately it doesn't look like I filed a bug as Simon requested. I probably failed to reproduce easily, and then forgot. But it still definitely happens.
On Wed, Mar 22, 2017 at 3:59 PM, Ben Franksen
wrote: This is what I get after removing a file from the working tree and also from the cabal file for the project and then rebuild.
WARNING in hptSomeThingsBelowUs missing module Darcs.Util.Environment Probable cause: out-of-date interface files
I am using cabal new-build. Cabal folks tell me this is a ghc problem. I am using ghc-7.10.3.