Provide slightly more information when there are multiple packages

Partially addresses haskell#6197
hololeap · Apr 24, 2022 · 9a23844 · 9a23844
1 parent b04450c
commit 9a23844
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/cabal-install/src/Distribution/Client/ProjectOrchestration.hs b/cabal-install/src/Distribution/Client/ProjectOrchestration.hs
@@ -551,8 +551,9 @@ resolveTargets selectPackageTargets selectComponentTarget
       | otherwise
       = Left (TargetProblemNoSuchPackage pkgid)
 
-    checkTarget (TargetPackage _ _ _)
-      = error "TODO: add support for multiple packages in a directory"
+    checkTarget (TargetPackage _ pkgids _)
+      = error ("TODO: add support for multiple packages in a directory.  Got\n"
+              ++ unlines (map prettyShow pkgids))
       -- For the moment this error cannot happen here, because it gets
       -- detected when the package config is being constructed. This case
       -- will need handling properly when we do add support.