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diff --git a/gcc/testsuite/gfortran.dg/substr_6.f90 b/gcc/testsuite/gfortran.dg/substr_6.f90
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+! { dg-do run }
+! { dg-options "-std=legacy" }
+!
+! Check that NULs don't mess up constant substring simplification
+CHARACTER(5), parameter :: c0(1) = (/ "123" // ACHAR(0) // "5" /)
+CHARACTER*5 c(1)
+CHARACTER(1), parameter :: c1(5) = (/ "1", "2", "3", ACHAR(0), "5" /)
+
+c = c0(1)(-5:-8)
+if (c(1) /= " ") call abort()
+c = (/ c0(1)(1:5) /)
+do i=1,5
+ if (c(1)(i:i) /= c1(i)) call abort()
+end do
+print *, c(1)
+end