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diff --git a/gcc/testsuite/gfortran.dg/array_alloc_1.f90 b/gcc/testsuite/gfortran.dg/array_alloc_1.f90
new file mode 100644
index 000000000..17be757a9
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+++ b/gcc/testsuite/gfortran.dg/array_alloc_1.f90
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+! PR 21104.  Make sure that either f() or its caller will allocate
+! the array data.  We've decided to make the caller allocate it.
+! { dg-do run }
+program main
+  implicit none
+  call test (f ())
+contains
+  subroutine test (x)
+    integer, dimension (10) :: x
+    integer :: i
+    do i = 1, 10
+      if (x (i) .ne. i * 100) call abort
+    end do
+  end subroutine test
+
+  function f ()
+    integer, dimension (10) :: f
+    integer :: i
+    forall (i = 1:10) f (i) = i * 100
+  end function f
+end program main