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diff --git a/gcc/testsuite/gfortran.dg/alloc_comp_assign_5.f90 b/gcc/testsuite/gfortran.dg/alloc_comp_assign_5.f90
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+++ b/gcc/testsuite/gfortran.dg/alloc_comp_assign_5.f90
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+! { dg-do run }
+! { dg-options "-O2" }
+! Tests the fix for PR29428, in which the assignment of
+! a function result would result in the function being
+! called twice, if it were not a result by reference,
+! because of a spurious nullify in gfc_trans_scalar_assign.
+!
+! Contributed by Paul Thomas  <pault@gcc.gnu.org>
+!
+program test
+implicit none
+
+  type A
+    integer, allocatable :: j(:)
+  end type A
+
+  type(A):: x
+  integer :: ctr = 0
+
+  x = f()
+
+  if (ctr /= 1) call abort ()
+
+contains
+
+  function f()
+    type(A):: f
+      ctr = ctr + 1
+      f = A ((/1,2/))
+  end function f
+
+end program
+