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-rw-r--r--gcc/testsuite/gfortran.dg/zero_length_1.f9018
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diff --git a/gcc/testsuite/gfortran.dg/zero_length_1.f90 b/gcc/testsuite/gfortran.dg/zero_length_1.f90
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--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/zero_length_1.f90
@@ -0,0 +1,18 @@
+! { dg-do run }
+! PR libfortran/31210
+program test
+ implicit none
+ integer :: l = 0
+ character(len=20) :: s
+
+ write(s,'(A,I1)') foo(), 0
+ if (trim(s) /= "0") call abort
+
+contains
+
+ function foo()
+ character(len=l) :: foo
+ foo = "XXXX"
+ end function
+
+end program test