[Haskell-cafe] Reader monad, implicit parameters, or something else altogether?

[Henning Thielemann]

On Fri, 22 Aug 2008, Alexander Dunlap wrote:

> You can always change how you unsafePerformIO the data, though. If you
> want to set Planck's constant to 42 (or whatever), just change the
> unsafePerformIO $ <whatever> to unsafePerformIO $ return 42.

you can't change it at runtime