SAA support for _hideDIM_SxA_ seems broken

When compiling:

int main ()
{

   a = [_hideDim_SxA_(0, 2)];
   b = _add_VxV_( a, a);
   return _sel_VxA_([0], b);
}

with sac2c 2.0.0-Tintigny-83-gad4ea2 and -v3, I get:

 **** Symbolic array attribute cycle 2 pass: 1
  ****** Optimizing regular function:
  ******  _MAIN::main( ): ...
Internal compiler error
Assertion "NULL != AVIS_DIM (ID_AVIS (id))" failed at /Volumes/Users/sbs/sac2c/src/libsac2c/stdopt/makeshapeexpr.c:116 -- Making assign for Id without Dimension!