try building doctests on examples

cabal.project

@@ -0,0 +1,2 @@
+packages: *.cabal
+write-ghc-environment-files: always

doctest/Main.hs

@@ -9,7 +9,7 @@ main = do
   args <- getArgs
   cremPackage <- findCabalPackage "crem"
   cremLib <- extractCabalLibrary cremPackage
-  -- cremExamplesLib <- extractSpecificCabalLibrary (Just "crem-examples") cremPackage
+  cremExamplesLib <- extractSpecificCabalLibrary (Just "crem-examples") cremPackage
   let
-    wholeCremLib = mergeLibraries [cremLib {-, cremExamplesLib-}]
+    wholeCremLib = mergeLibraries [cremLib, cremExamplesLib]
   mainFromLibrary wholeCremLib args

nix/haskell-source.nix

@@ -6,4 +6,5 @@
   "src"
   "spec"
   "package.yaml"
+  "cabal.project"
 ]

package.yaml

@@ -146,6 +146,7 @@ tests:
       - -Wno-unused-packages
     dependencies:
       - crem
+      - crem-examples
       - doctest-parallel
     when:
     - condition: false