Language extensions - backwards compatibility

[Malcolm Wallace]

> Any sort of preprocessing at the beginning of a file appears to  
> insert enough noise to inhibit recognition of file-header pragmas.  
> (Cpphs doesn't appear to help here.)

The flag -P for traditional gnu cpp (or --noline for stand-alone  
cpphs) should suppress the initial #line noise.

Does ghc still fail to recognise a module-start pragma, even if the  
only characters preceding it are whitespace?

Regards,
     Malcolm