https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81116

            Bug ID: 81116
           Summary: Last character of allocatable-length string reset to
                    blank in an assigment
           Product: gcc
           Version: 6.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: clivegpage at gmail dot com
  Target Milestone: ---

This program shows that the last character of "string" is replaced by a blank,
but when a different variable is on the left side of the assignment the
expected result is obtained:

program test10
implicit none
character(:), allocatable :: string, new
!
string = '1234567890'
string = string(1:5) // string(7:)
print *, ' string="', string, '"'
!
string = '1234567890'
new = string(1:5) // string(7:)
print *,' new=   "', new, '"'
end program test10

The output I get is:
  string="12345789 "
  new=   "123457890"

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