patch applied (ghc-6.6/ghc): MERGED: partial fix for #1119

[Ian Lynagh]

Sun Apr  1 07:29:44 PDT 2007  Ian Lynagh <igloo at earth.li>
  * MERGED: partial fix for #1119
  Simon Marlow <simonmar at microsoft.com>**20070327152215
   Unless we're in one-shot mode, emit an error if we attempt to
   demand-load interfaces for home modules.  This can only happen in one
   way (that I'm aware of): typing a qualified name at the GHCi prompt
   that refers to a module that isn't loaded.  Previously you got a
   cryptic message about not finding an interface file, now you get:
   
   Prelude> Foo.a
   
   <interactive>:1:0:
       attempting to use module `Foo' (Foo.hs) which is not loaded
   
   Of course you can still refer to package modules like this without
   loading them explicitly, only home modules are affected, and the
   behaviour is exactly the same as if you try to ':browse Foo' and
   Foo isn't loaded.

    M ./compiler/iface/LoadIface.lhs -19 +23