From 575be1a7fe775f8165188879a8ec8a0cd65a732d Mon Sep 17 00:00:00 2001
From: Florian Albrechtskirchinger <falbrechtskirchinger@gmail.com>
Date: Sat, 5 Mar 2022 10:21:13 +0100
Subject: [PATCH] Fix custom allocator test build failures (C++20)

Allocator tests fail to compile in C++20 mode with clang+MS STL due
to missing copy constructors.
---
 test/src/unit-allocator.cpp   | 2 ++
 test/src/unit-regression2.cpp | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/test/src/unit-allocator.cpp b/test/src/unit-allocator.cpp
index 2671212f5..268ae54df 100644
--- a/test/src/unit-allocator.cpp
+++ b/test/src/unit-allocator.cpp
@@ -39,6 +39,8 @@ namespace
 template<class T>
 struct bad_allocator : std::allocator<T>
 {
+    using std::allocator<T>::allocator;
+
     template<class... Args>
     void construct(T* /*unused*/, Args&& ... /*unused*/)
     {
diff --git a/test/src/unit-regression2.cpp b/test/src/unit-regression2.cpp
index 52db3589c..7c466b0b3 100644
--- a/test/src/unit-regression2.cpp
+++ b/test/src/unit-regression2.cpp
@@ -271,7 +271,10 @@ std::string* sax_no_exception::error_string = nullptr;
 
 template<class T>
 class my_allocator : public std::allocator<T>
-{};
+{
+  public:
+    using std::allocator<T>::allocator;
+};
 
 /////////////////////////////////////////////////////////////////////
 // for #3077