Could not find module, it is a member of the hidden package haskell98

Question

When I try to compile a simple source file with import IO or import Random, the build fails with an error message like this:

Could not find module 'IO'
It is a member of the hidden package 'haskell98-2.0.0.1'
Use -v to see a list of the files searched for

Answer 1

The module names changed at some point. You probably want import System.IO and import System.Random instead.

Here is the module hierarchy for the standard libraries in GHC 7.6.1.