gcc/testsuite/gfortran.dg/interface_12.f90

   1 ! { dg-do run }
   2 ! Test the fix for PR31293.
   3 !
   4 ! File: interface4.f90
   5 ! http://home.comcast.net/%7Ekmbtib/Fortran_stuff/interface4.f90
   6 ! Public domain 2004 James Van Buskirk
   7 ! Second attempt to actually create function with LEN
   8 ! given by specification expression via function name,
   9 ! and SIZE given by specification expression via
  10 ! result name.
  11
  12 ! g95 12/18/04: Error: Circular specification in variable 'r'.
  13 ! ISO/IEC 1539-1:1997(E) section 512.5.2.2:
  14 ! "If RESULT is specified, the name of the result variable
  15 ! of the function is result-name, its characteristics
  16 ! (12.2.2) are those of the function result, and..."
  17 ! Also from the same section:
  18 ! The type and type parameters (if any) of the result of the
  19 ! function subprogram may be specified by a type specification
  20 ! in the FUNCTION statement or by the name of the result variable
  21 ! appearing in a type statement in the declaration part of the
  22 ! function subprogram.  It shall not be specified both ways."
  23 ! Also in section 7.1.6.2:
  24 ! "A restricted expression is one in which each operation is
  25 ! intrinsic and each primary is
  26 ! ...
  27 ! (7) A reference to an intrinsic function that is
  28 ! ...
  29 !     (c) the character inquiry function LEN,
  30 ! ...
  31 !     and where each primary of the function is
  32 ! ...
  33 !     (b) a variable whose properties inquired about are not
  34 !         (i)   dependent on the upper bound of the last
  35 !               dimension of an assumed-shape array.
  36 !         (ii)  defined by an expression that is not a
  37 !               restricted expression
  38 !         (iii) definable by an ALLOCATE or pointer
  39 !               assignment statement."
  40 ! So I think there is no problem with the specification of
  41 ! the function result attributes; g95 flunks.
  42
  43 ! CVF 6.6C3: Error: This name does not have a type, and must
  44 ! have an explicit type. [R]
  45 ! Clearly R has a type here: the type and type parameters of
  46 ! the function result; CVF flunks.
  47
  48 ! LF95 5.70f: Type parameters or bounds of variable r may
  49 ! not be inquired.
  50 ! Again, the type parameters, though not the bounds, of
  51 ! variable r may in fact be inquired; LF95 flunks.
  52
  53 module test1
  54    implicit none
  55    contains
  56       character(f (x)) function test2 (x) result(r)
  57          implicit integer (x)
  58          dimension r(modulo (len (r) - 1, 3) + 1)
  59          integer, intent(in) :: x
  60          interface
  61             pure function f (x)
  62                integer, intent(in) :: x
  63                integer f
  64             end function f
  65          end interface
  66          integer i
  67
  68          do i = 1, len (r)
  69             r(:)(i:i) = achar (mod (i, 32) + iachar ('@'))
  70          end do
  71       end function test2
  72 end module test1
  73
  74 program test
  75    use test1
  76    implicit none
  77    character(21) :: chr (3)
  78    chr = "ABCDEFGHIJKLMNOPQRSTU"
  79
  80    if (len (test2 (10)) .ne. 21) STOP 1
  81    if (any (test2 (10) .ne. chr)) STOP 2
  82 end program test
  83
  84 pure function f (x)
  85    integer, intent(in) :: x
  86    integer f
  87
  88    f = 2*x+1
  89 end function f