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diff --git a/gcc/testsuite/gfortran.dg/alloc_comp_constraint_2.f90 b/gcc/testsuite/gfortran.dg/alloc_comp_constraint_2.f90
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+! { dg-do compile }
+! Check that equivalence with allocatable components isn't allowed (PR 20541)
+program main
+
+ type :: foo
+ sequence
+ integer, allocatable :: x(:)
+ end type foo
+
+ type(foo) :: a
+ integer :: b
+
+ equivalence (a, b) ! { dg-error "cannot have ALLOCATABLE components" }
+
+end program main