haskell/win32 — pull request #5 by Tinctorius (2012-05-14 18:39:53+00:00)
Title: Graphics.Win32.Misc: import MessageBoxW safely

The MessageBox API call is not exactly primitive. It creates a lot of windows and sub-windows, which may cause window message callbacks (in Haskell) to fire. As such, MessageBox must be imported safely.