--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/deferred_character_6.f90	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,54 @@
+! { dg-do run }
+!
+! Tests that PR66408 stays fixed.
+!
+! Contributed by <werner.blokbuster@gmail.com>
+!
+module mytest
+
+    implicit none
+
+    type vary
+        character(:), allocatable :: string
+    end type vary
+
+    interface assignment(=)
+        module procedure char_eq_vary
+    end interface assignment(=)
+
+contains
+
+    subroutine char_eq_vary(my_char,my_vary)
+        character(:), allocatable, intent(out) :: my_char
+        type(vary), intent(in) :: my_vary
+        my_char = my_vary%string
+    end subroutine char_eq_vary
+
+end module mytest
+
+
+program thistest
+
+    use mytest, only: vary, assignment(=)
+    implicit none
+
+    character(:), allocatable :: test_char
+    character(14), parameter :: str = 'example string'
+    type(vary) :: test_vary
+    type(vary) :: my_stuff
+
+
+    test_vary%string = str
+    if (test_vary%string .ne. str) call abort
+
+! This previously gave a blank string.
+    my_stuff%string = test_vary
+    if (my_stuff%string .ne. str) call abort
+
+    test_char = test_vary
+    if (test_char .ne. str) call abort
+
+    my_stuff = test_vary
+    if (my_stuff%string .ne. str) call abort
+
+end program thistest