[RFC, fortran] Output contained namespaces in module (PR fortran/16861)

[Paul Thomas]

David,

In the course of diagnosing a couple of other module bugs, I added 
pr16861 to the list of tests.  

To my enormous surprise, I find that my patch for pr16940 ( 
http://gcc.gnu.org/ml/fortran/2005-07/msg00004.html )  fixes pr16861 
too.  I was so surprised that I have rebuilt gcc with and without the 
patch, just to make sure.  This convinces me of the suspicion that 
read_module is the place to be stalking this one.

This fix detects symbols that have the same name as an interface, in a 
parent namespace, and deletes them, whilst connecting the symtree up to 
the correct symbol, in the parent namespace.  I am trying, at the 
moment, to find why these bad symbols are there in the first place and 
to produce a better fix.

I have attached an improved version of the original patch.

Paul T


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