[patch, fortran] PR Detect same values in vector expression subscripts

[Thomas Koenig]

Hello world,

this patch yields an error for identical values in vector expression
subscripts.  The algorithm is O(n**2) because

a) It would be impossible to detect a([i,i]) otherwise
b) This is not likely to be a performance bottleneck because
    people don't use large vector indices.

(as noted by the different comments in the PR).

Regression-tested.  OK for trunk?

	Thomas

2013-07-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/58009
         * expr.c (gfc_check_vardef_context):  Check for same values in
         vector expression subscripts.

2013-07-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/58009
         * gfortran.dg/vector_subsript_7.f90:  New test.

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