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! RUN: %S/test_errors.sh %s %t %f18
! Test 15.7 C1591 & others: contexts requiring pure subprograms
module m
type :: t
contains
procedure, nopass :: tbp_pure => pure
procedure, nopass :: tbp_impure => impure
end type
type, extends(t) :: t2
contains
!ERROR: An overridden pure type-bound procedure binding must also be pure
procedure, nopass :: tbp_pure => impure ! 7.5.7.3
end type
contains
pure integer function pure(n)
integer, value :: n
pure = n
end function
impure integer function impure(n)
integer, value :: n
impure = n
end function
subroutine test
real :: a(pure(1)) ! ok
!ERROR: Invalid specification expression: reference to impure function 'impure'
real :: b(impure(1)) ! 10.1.11(4)
forall (j=1:1)
!ERROR: Impure procedure 'impure' may not be referenced in a FORALL
a(j) = impure(j) ! C1037
end forall
forall (j=1:1)
!ERROR: Impure procedure 'impure' may not be referenced in a FORALL
a(j) = pure(impure(j)) ! C1037
end forall
!ERROR: DO CONCURRENT mask expression may not reference impure procedure 'impure'
do concurrent (j=1:1, impure(j) /= 0) ! C1121
!ERROR: Call to an impure procedure is not allowed in DO CONCURRENT
a(j) = impure(j) ! C1139
end do
end subroutine
subroutine test2
type(t) :: x
real :: a(x%tbp_pure(1)) ! ok
!ERROR: Invalid specification expression: reference to impure function 'impure'
real :: b(x%tbp_impure(1))
forall (j=1:1)
a(j) = x%tbp_pure(j) ! ok
end forall
forall (j=1:1)
!ERROR: Impure procedure 'impure' may not be referenced in a FORALL
a(j) = x%tbp_impure(j) ! C1037
end forall
do concurrent (j=1:1, x%tbp_pure(j) /= 0) ! ok
a(j) = x%tbp_pure(j) ! ok
end do
!ERROR: DO CONCURRENT mask expression may not reference impure procedure 'impure'
do concurrent (j=1:1, x%tbp_impure(j) /= 0) ! C1121
!ERROR: Call to an impure procedure component is not allowed in DO CONCURRENT
a(j) = x%tbp_impure(j) ! C1139
end do
end subroutine
subroutine test3
type :: t
integer :: i
end type
type(t) :: a(10), b
forall (i=1:10)
a(i) = t(pure(i)) ! OK
end forall
forall (i=1:10)
!ERROR: Impure procedure 'impure' may not be referenced in a FORALL
a(i) = t(impure(i)) ! C1037
end forall
end subroutine
subroutine test4(ch)
type :: t
real, allocatable :: x
end type
type(t) :: a(1), b(1)
character(*), intent(in) :: ch
allocate (b(1)%x)
! Intrinsic functions and a couple subroutines are pure; do not emit errors
do concurrent (j=1:1)
b(j)%x = cos(1.) + len(ch)
call move_alloc(from=b(j)%x, to=a(j)%x)
end do
end subroutine
end module
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