The above has been fixed as 'obvious' on all three branches. Revisions 264249, 264251 and 264288.
Cheers Paul 2018-09-13 Paul Thomas <pa...@gcc.gnu.org> PR fortran/87284 * trans-expr.c (gfc_trans_class_init_assign): Access to to array elements of the dynamic type requires that the array reference be added to the class expression and not the _data component, unlike scalar expressions. 2018-09-13 Paul Thomas <pa...@gcc.gnu.org> PR fortran/87284 * gfortran.dg/allocate_with_mold_2.f90: New test.