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From: "urbanjost at comcast dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/95947] PACK intrinsic returns blank strings when an
 allocatable character array with allocatable length is used
Date: Sun, 28 Jun 2020 21:20:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95947

--- Comment #2 from urbanjost at comcast dot net ---
Per feedback made test more like a unit test:

TEST PROGRAM:
   character(len=3D:),allocatable  :: m(:) !!NOTE: WORKS WITH len=3D10 inst=
ead of
len=3D:
   logical :: passed
      m =3D [ character(len=3D10) :: 'ape','bat','cat','dog','eel','fly','g=
nu']
      m =3D pack( m, mask=3Dm(:)(2:2) =3D=3D 'a' )

      print *, "m =3D ", m,                     "; expected is ['bat','cat'=
]"
      passed=3Dall(m.eq.['bat','cat'])

      print *, "size(m) =3D     ", size(m),     "; expected is 2"
      passed=3Dsize(m).eq.2.and.passed

      print *, "len(m) =3D      ", len(m),      "; expected is 10"
      passed=3Dlen(m).eq.10.and.passed

      print *, "len_trim(m) =3D ", len_trim(m), "; expected is 3 3"
      passed=3Dall(len_trim(m).eq.[3,3]).and.passed
      if(passed)then
         stop 'PASSED'
      else
         write(*,'("FAILED")')
         stop 1
      endif
   end

RESULTS:

    m =3D                     ; expected is ['bat','cat']
    size(m) =3D                2 ; expected is 2
    len(m) =3D                10 ; expected is 10
    len_trim(m) =3D            0           0 ; expected is 3 3
   FAILED
   STOP 1=