Patch ping**2

[Feng Wang]

> 2005-03-05 [gfortran] More type-safety issues
> http://gcc.gnu.org/ml/fortran/2005-03/msg00071.html
> (the part which removes the fold_convert doesn't work with the g77 calling
> conventions, but I think the should remove support for the NULL rhs anyway,
> and that part is independent)
> 
I agree with this one. It's more reasonable.

Best Regards,
Feng Wang

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