[gfortran] Fix NULL reference types.

[Nathan Sidwell]

Richard Henderson wrote:
> On Wed, Aug 18, 2004 at 10:10:04AM -0400, Richard Kenner wrote:
> 
>>My question was whether the optimizers currently take advantage of that fact.

> Nope.  I, for one, wasn't aware of it.
Would this be a useful distinction to make then?

nathan

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