RFC: Experimental BLOCK implementation

[Daniel Kraft]

Hi all,

attached is an experimental draft patch to implement the F2008 BLOCK 
construct.  There seem to be some interesting corner cases and 
interpretations about BLOCK (see 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39626, especially Tobias' 
pointer), but I'm just trying to get the 'basic' stuff right without 
caring for now about some peculiarities.

The patch works so far for what I would expect from BLOCK (see the test 
cases), but misses some checks that only stuff really allowed with a 
BLOCK is included there, and some other item that I think is wrong at 
the moment is that variables that get implicitly typed within the block 
would have only the block as their scope -- this is not in line with the 
draft standard, AFAIK.

Additionally, I'm not sure if my implementation uses the 'best' and 
'cleanest' ways...  Comments very welcome!  My plan is to work on the 
missing checks and then submit the revised patch for review.

Yours,
Daniel

-- 
Done:  Arc-Bar-Cav-Ran-Rog-Sam-Tou-Val-Wiz
To go: Hea-Kni-Mon-Pri
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