Safe Haskell trust

Edward Kmett ekmett at
Sun Mar 16 17:34:30 UTC 2014

Not directly. You can, however, make a Trustworthy module that re-exports
the (parts of) the Unsafe ones you want to allow yourself to use.


On Sun, Mar 16, 2014 at 12:57 PM, Fabian Bergmark <fabian.bergmark at
> wrote:

> Im using the Hint library in a project where users are able to upload
> and run code. As I don't want them to do any IO, I run the interpreter
> with -XSafe. However, some packages (in my case aeson) are needed and
> I therefore tried marking them as trusted with ghc-pkg trust aeson.
> This seems to have no effect however and the interpreter fails with:
> Data.Aeson: Can't be safely imported! The module itself isn't safe
> Is there any way to get XSafe-like guarantees with the ability of
> allowing certain packages?
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