patch applied (ghc): Fix a knot-tying bug with ghc --make

[Simon Peyton Jones]

Wed Aug  1 05:49:07 PDT 2007  simonpj at microsoft.com
  * Fix a knot-tying bug with ghc --make
  
  This bug showed up when I touched Data.Generics.Schemes, and then said
  	make build.library.base
  This compiles the base library with --make, and I got an assertion failure
  in TcIface.  The explanation is in Note [Tying the knot] in TcIface.
  
  As well as fixing the bug, I also impoved the assertion message.
  
  This might fix or improve other knot-tying problems with --make
  

    M ./compiler/iface/TcIface.lhs -18 +35