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! Test passing procedure variables through implicit interface call chains
! This verifies that Function argument type info propagates to implicit
! interface parameters, enabling correct codegen without bitcast workarounds.
program implicit_interface_25
implicit none
real(8) :: result, expected
! Test 1: Pass a function through an implicit interface call chain
expected = 25.0d0
call test_procedure_pass(square_fn, 5.0d0, result)
if (abs(result - expected) > 1.0d-10) error stop "Test 1 failed"
! Test 2: Different function, same interface
expected = 8.0d0
call test_procedure_pass(double_fn, 4.0d0, result)
if (abs(result - expected) > 1.0d-10) error stop "Test 2 failed"
! Test 3: Chain through two implicit interface levels
expected = 49.0d0
call outer_chain(square_fn, 7.0d0, result)
if (abs(result - expected) > 1.0d-10) error stop "Test 3 failed"
print *, "PASSED"
contains
real(8) function square_fn(x)
real(8), intent(in) :: x
square_fn = x * x
end function
real(8) function double_fn(x)
real(8), intent(in) :: x
double_fn = x * 2.0d0
end function
end program
! Subroutine with implicit interface for the procedure argument
subroutine test_procedure_pass(f, x, result)
implicit none
real(8), intent(in) :: x
real(8), intent(out) :: result
real(8), external :: f
result = f(x)
end subroutine
! Outer chain: passes procedure through another implicit interface layer
subroutine outer_chain(f, x, result)
implicit none
real(8), intent(in) :: x
real(8), intent(out) :: result
real(8), external :: f
! Call inner routine which also has implicit interface for f
call inner_apply(f, x, result)
end subroutine
! Inner layer of the chain
subroutine inner_apply(func, val, out)
implicit none
real(8), intent(in) :: val
real(8), intent(out) :: out
real(8), external :: func
out = func(val)
end subroutine
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