Remove GHC.Err import from Data.Maybe

[Stefan O'Rear]

On Fri, Jan 04, 2008 at 09:12:20AM +0000, Simon Peyton-Jones wrote:
> The trouble is that 'error' calls an I/O function to print its message, and the I/O functions in turn depend on a *lot* of stuff. So 'error' can be defined only when a lot of other functions have been defined.
> 
> But 'error' is *needed* very early; e.g. to define 'head'.

Why is this necessary in post-exceptions Haskell?  Can we not just have
error be:

error str = throw# (ErrorCall str)

?

The exception is only printed if the exception reaches the top level;
but it seems that the most logical place to handle that is in the RTS
uncaught-exception handler.

Stefan
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