PR fortran/27958
* trans-expr.c (gfc_conv_substring): If the substring start is
greater than its end, the length of the substring is zero, and
not negative.
(gfc_trans_string_copy): Don't generate a call to
_gfortran_copy_string when destination length is zero.
* gcc/testsuite/gfortran.dg/substr_2.f: New test.
From-SVN: r114496
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