[Patch, Fortran] (Coarray) Fix constraint checks for LOCK_TYPE

[Tobias Burnus]

On 05 August 2011 16:42, Mikael Morin wrote:
> OK, I played a bit myself to see what the "right way" would look like, and I
> came up with the attached patch, which is complicated, and not even correct.
> And indeed, it plays with allocatable and pointer stuff.
> So your approach makes some sense now.
>
> I do here some propositions for comment and error messages which IMO explain
> better where the problem lies (Iff I have understood the problem correctly).
> They are quite verbose however, and possibly not correct english (many
> negations).

Thanks for reviewing the patch and for the suggestions!

Attached is an updated version of the patch, I hope it is now better, 
though I think there is still room for improvement.

Changes:
- coarray_lock_5.f90: Added subroutine test2 with several additional 
test cases
- updated dg-error
- parse.c's parse_derived: Add one comment, updated all error texts, 
fixed codimension -> coarray_comp bug, added missing check and split 
some of the checks into LOCK_TYPE and lock_comp.

Build and regtested on x86-64-linux.
OK - or suggestions how to improve it further?

Tobias
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