! RUN: %python %S/test_errors.py %s %flang_fc1 -pedantic
subroutine forall1
real :: a(9)
!ERROR: 'i' is already declared in this scoping unit
!ERROR: Cannot redefine FORALL variable 'i'
forall (i=1:8, i=1:9) a(i) = i
!ERROR: 'i' is already declared in this scoping unit
!ERROR: Cannot redefine FORALL variable 'i'
forall (i=1:8, i=1:9)
a(i) = i
end forall
forall (j=1:8)
!PORTABILITY: Index variable 'j' should not also be an index in an enclosing FORALL or DO CONCURRENT
forall (j=1:9)
end forall
end forall
end
subroutine forall2
integer, pointer :: a(:)
integer, target :: b(10,10)
forall (i=1:10)
!ERROR: Impure procedure 'f_impure' may not be referenced in a FORALL
a(f_impure(i):) => b(i,:)
end forall
!ERROR: FORALL mask expression may not reference impure procedure 'f_impure'
forall (j=1:10, f_impure(1)>2)
end forall
contains
impure integer function f_impure(i)
f_impure = i
end
end
subroutine forall3
real :: x
forall(i=1:10)
!ERROR: Cannot redefine FORALL variable 'i'
i = 1
end forall
forall(i=1:10)
forall(j=1:10)
!ERROR: Cannot redefine FORALL variable 'i'
!WARNING: FORALL index variable 'j' not used on left-hand side of assignment
i = 1
end forall
end forall
!ERROR: Cannot redefine FORALL variable 'i'
forall(i=1:10) i = 1
end
subroutine forall4
integer, parameter :: zero = 0
integer :: a(10)
!ERROR: FORALL limit expression may not reference index variable 'i'
forall(i=1:i)
a(i) = i
end forall
!ERROR: FORALL step expression may not reference index variable 'i'
forall(i=1:10:i)
a(i) = i
end forall
!ERROR: FORALL step expression may not be zero
forall(i=1:10:zero)
a(i) = i
end forall
!ERROR: FORALL limit expression may not reference index variable 'i'
forall(i=1:i) a(i) = i
!ERROR: FORALL step expression may not reference index variable 'i'
forall(i=1:10:i) a(i) = i
!ERROR: FORALL step expression may not be zero
forall(i=1:10:zero) a(i) = i
end
subroutine forall5
real, target :: x(10), y(10)
forall(i=1:10)
x(i) = y(i)
end forall
forall(i=1:10)
!WARNING: FORALL index variable 'i' not used on left-hand side of assignment
x = y
forall(j=1:10)
!WARNING: FORALL index variable 'j' not used on left-hand side of assignment
x(i) = y(i)
!WARNING: FORALL index variable 'i' not used on left-hand side of assignment
x(j) = y(j)
endforall
endforall
do concurrent(i=1:10)
x = y
!Odd rule from F'2023 19.4 p8
!PORTABILITY: Index variable 'i' should not also be an index in an enclosing FORALL or DO CONCURRENT
!WARNING: FORALL index variable 'i' not used on left-hand side of assignment
forall(i=1:10) x = y
end do
end
subroutine forall6
type t
real, pointer :: p
end type
type(t) :: a(10)
real, target :: b(10)
forall(i=1:10)
a(i)%p => b(i)
!WARNING: FORALL index variable 'i' not used on left-hand side of assignment
a(1)%p => b(i)
end forall
end
subroutine forall7(x)
integer :: iarr(1)
real :: a(10)
class(*) :: x
associate (j => iarr(1))
!PORTABILITY: Index variable 'j' should be a scalar object or common block if it is present in the enclosing scope
forall (j=1:size(a))
a(j) = a(j) + 1
end forall
end associate
associate (j => iarr(1) + 1)
!PORTABILITY: Index variable 'j' should be a scalar object or common block if it is present in the enclosing scope
forall (j=1:size(a))
a(j) = a(j) + 1
end forall
end associate
select type (j => x)
type is (integer)
!PORTABILITY: Index variable 'j' should be a scalar object or common block if it is present in the enclosing scope
forall (j=1:size(a))
a(j) = a(j) + 1
end forall
end select
end subroutine
subroutine forall8(x)
real :: x(10)
real, external :: foo
!ERROR: Impure procedure 'foo' may not be referenced in a FORALL
forall(i=1:10) x(i) = foo() + i
!OK
associate(y => foo())
forall (i=1:10) x(i) = y + i
end associate
end subroutine
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