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Re: [gfortran] PR libfortran/21376

Well, we can't test for the same error, but we can verify that the output is
indeed correct.  This is what I meantt the testcase should be for.

Commited the attached testcase.

FX 
! { dg-do run }
! PR 21376
! we used to take the logarithm of zero in this special case
  character*10 c
  write (c,'(e10.4)') 1.0
  if(c /= "0.1000E+01") call abort
  write (c,'(e10.4)') 0.0
  if(c /= "0.0000E+00") call abort
  write (c,'(e10.4)') 1.0d100
  if(c /= "0.1000+101") call abort
  write (c,'(e10.4)') 1.0d-102
  if(c /= "0.1000-101") call abort
end
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