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diff --git a/gcc/testsuite/g++.dg/template/anon4.C b/gcc/testsuite/g++.dg/template/anon4.C
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+++ b/gcc/testsuite/g++.dg/template/anon4.C
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+// PR c++/28407
+// A declaration in the anonymous namespace still has external linkage.
+
+template <int *P> class A { };
+namespace
+{
+ int i;
+}
+
+A<&i> a;