commit 5f1db7627f6eea2050c3d71f17bca5ecf586a813
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Sep 24 13:23:34 2021

    libstdc++: Improve types used as iterators in testsuite
    
    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/25_algorithms/copy/34595.cc: Add missing operation
            for type used as an iterator.
            * testsuite/25_algorithms/unique_copy/check_type.cc: Likewise.

diff --git a/libstdc++-v3/testsuite/25_algorithms/copy/34595.cc b/libstdc++-v3/testsuite/25_algorithms/copy/34595.cc
index c534eeb17f5..513425a5a2c 100644
--- a/libstdc++-v3/testsuite/25_algorithms/copy/34595.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/copy/34595.cc
@@ -27,11 +27,12 @@ class Counting_output_iterator
 public:
   Counting_output_iterator() : c(0) {}
   Counting_output_iterator& operator++() { return *this; }
+  Counting_output_iterator operator++(int) { return *this; }
   Counting_output_iterator& operator*() { return *this; }
-  
+
   template <typename T>
   void operator=(const T&) { ++c; }
-  
+
   std::size_t current_counter() const { return c; }
 };
 
diff --git a/libstdc++-v3/testsuite/25_algorithms/unique_copy/check_type.cc b/libstdc++-v3/testsuite/25_algorithms/unique_copy/check_type.cc
index af86548609f..27b35794e8a 100644
--- a/libstdc++-v3/testsuite/25_algorithms/unique_copy/check_type.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/unique_copy/check_type.cc
@@ -25,27 +25,35 @@
 using __gnu_test::input_iterator_wrapper;
 using __gnu_test::output_iterator_wrapper;
 
-struct S1 { };
+template<typename T>
+struct iter_facade
+{
+  T& operator++();
+  T operator++(int);
+  T& operator*() const;
+};
 
-struct S2
+struct S1 : iter_facade<S1> { };
+
+struct S2 : iter_facade<S2>
 {
   S2(const S1&) {}
 };
 
-bool 
+bool
 operator==(const S1&, const S1&) {return true;}
 
-struct X1 { };
+struct X1 : iter_facade<X1>  { };
 
-struct X2
+struct X2 : iter_facade<X2>
 {
   X2(const X1&) {}
 };
 
-bool 
+bool
 predicate(const X1&, const X1&) {return true;}
 
-output_iterator_wrapper<S2> 
+output_iterator_wrapper<S2>
 test1(input_iterator_wrapper<S1>& s1, output_iterator_wrapper<S2>& s2)
 { return std::unique_copy(s1, s1, s2); }