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diff --git a/gcc/testsuite/gfortran.dg/pr20480.f90 b/gcc/testsuite/gfortran.dg/pr20480.f90
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+! { dg-do run }
+! PR libfortran/20480
+! fxcoudert@gcc.gnu.org
+ character(len=80) c
+ write (c,'(ES12.3)') 0.0
+ if (trim(adjustl(c)) .ne. '0.000E+00') call abort ()
+ write (c,'(EN12.3)') 0.0
+ if (trim(adjustl(c)) .ne. '0.000E+00') call abort ()
+ end