-package should take priority over modules in the filesystem

[peteg]

Imagine I have a GHC package called P. I build it using Cabal and a directory structure like so:

P/ -- project root, containing P.cabal etc.
P/Code/M.hs
P/Tests/T.hs

I build P and install it.

In P/ I want to say:

ghci -package P Tests/T.hs

but ghci insists on loading Code/M.hs rather than using P - it seems to ignore the -package flag.

cheers peter

[simonmar]

This is a deliberate policy. For example, you can build and test new versions of your package without having to say -hide-package P. In your situation, just put the tests in a different directory that doesn't overlap with your package sources.