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diff --git a/gcc/testsuite/gfortran.dg/char_pointer_assign_6.f90 b/gcc/testsuite/gfortran.dg/char_pointer_assign_6.f90
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+++ b/gcc/testsuite/gfortran.dg/char_pointer_assign_6.f90
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+! { dg-do compile }
+! PR 31821
+program main
+ character (len=4), pointer:: s1
+ character (len=20), pointer :: p1
+ character (len=4) :: c
+ s1 = 'abcd'
+ p1 => s1(2:3) ! { dg-error "Unequal character lengths \\(20/2\\)" }
+ p1 => c(1:) ! { dg-error "Unequal character lengths \\(20/4\\)" }
+ p1 => c(:4) ! { dg-error "Unequal character lengths \\(20/4\\)" }
+end