error messages in Nov 2003 release

I'm not quite sure when it happened but error messages in the Nov 2003 release 
are much less informative than they used to be.  In particular, I was hoping 
to see a line number and filename in this message.

  Program error: pattern match failure

In contrast, ghci reports:

  *** Exception: gen_effect.hs:502: Non-exhaustive patterns in function
      writeResult

I'm guessing that what's happened is we're using non-deterministic exceptions 
in more of Hugs and the error object created in response to a pattern match 
failure doesn't record the line number, etc.

--
Alastair Reid      haskell-consulting.com