Parsing issue with 1e12

Hi Hat and Yhc people (and I guess nhc people as well),

Both GHC and Hugs parse 1e12 as a number, but Hat and Yhc
don't.

For example, test = print 1e12 gives:
yhc: -- during when renaming
Error: Identifier e12 used at 7:15-7:17 is not defined.

I have also been told that Hat leads to an error.

So:

1) Is this an error, what does the Haskell spec say?

2) Should the parser be fixed in all the right places? (does
this
impact Colin's hpc as well?)

Thanks

Neil
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"Neil Mitchell" <ndmitchellgmail.com> writes:

> Both GHC and Hugs parse 1e12 as a number, but Hat and
Yhc don't.

I suspect this was an unnoticed change in the Haskell Report
spec.
Originally I think the exponent form was allowed only if
there was a
decimal point before the 'e'.  I see this is no longer the
case.
Yes, this is likely to affect the hpc parser as well.

Regards,
    Malcolm
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