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diff --git a/gcc/testsuite/gfortran.dg/alloc_comp_constraint_1.f90 b/gcc/testsuite/gfortran.dg/alloc_comp_constraint_1.f90
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+! { dg-do compile }
+! Check that we don't allow IO or NAMELISTs with types with allocatable
+! components (PR 20541)
+program main
+
+ type :: foo
+ integer, allocatable :: x(:)
+ end type foo
+
+ type :: bar
+ type(foo) :: x
+ end type bar
+
+ type(foo) :: a
+ type(bar) :: b
+ namelist /blah/ a ! { dg-error "cannot have ALLOCATABLE components" }
+
+ write (*, *) a ! { dg-error "cannot have ALLOCATABLE components" }
+
+ read (*, *) b ! { dg-error "cannot have ALLOCATABLE components" }
+
+end program main