1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/template/ttp13.C b/gcc/testsuite/g++.dg/template/ttp13.C
new file mode 100644
index 000000000..2c35b3a79
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/ttp13.C
@@ -0,0 +1,20 @@
+// { dg-do compile }
+
+// Origin: Wolfgang Bangerth <bangerth@dealii.org>
+
+// PR c++/15664: Template substitution of template template parameter
+
+template <int N> struct S { 
+    template<template<typename> class A> 
+    friend void foo(); 
+}; 
+ 
+template<template<typename> class A> 
+void foo(); 
+ 
+template <typename> struct X {}; 
+ 
+int main () { 
+  S<1> s; 
+  foo<X>(); 
+}