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From: "boschmann at tp1 dot physik.uni-siegen.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/49638] New: [OOP] length parameter is ignored when overriding type bound character functions with constant length.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49638

           Summary: [OOP] length parameter is ignored when overriding type
                    bound character functions with constant length.
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: boschmann@tp1.physik.uni-siegen.de


module world
  implicit none
  type::world_1
   contains
     procedure,nopass::string=>w1_string
  end type world_1
  type,extends(world_1)::world_2
   contains
     procedure,nopass::string=>w2_string
  end type world_2
contains
  function w1_string()
    character(6)::w1_string
    w1_string=" world"
  end function w1_string
  function w2_string()
    character(7)::w2_string
    w2_string=" world2"
  end function w2_string
end module world
program hello
  use world
  implicit none
  type(world_1)::w1
  type(world_2)::w2
  print *,"hello world: hello",w1%string()
  print *,"hello world2: hello",w2%string()
end program hello

This program compiles and runs fine with gfortran 4.6.1 and gfortran 4.7.
Nevertheless, the length of an array is a type parameter and all type
parameters of an overriding function shall match the overridden type
parameters.