3 files changed, 3 insertions, 0 deletions
diff --git a/absl/flags/flag_test.cc b/absl/flags/flag_test.cc
index 6912b54..ba81317 100644
--- a/absl/flags/flag_test.cc
+++ b/absl/flags/flag_test.cc
@@ -61,6 +61,7 @@ void TestCallback() {}
 struct UDT {
   UDT() = default;
   UDT(const UDT&) = default;
+  UDT& operator=(const UDT&) = default;
 };
 bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
 std::string AbslUnparseFlag(const UDT&) { return ""; }
diff --git a/absl/flags/internal/usage_test.cc b/absl/flags/internal/usage_test.cc
index b5c2487..044d71c 100644
--- a/absl/flags/internal/usage_test.cc
+++ b/absl/flags/internal/usage_test.cc
@@ -45,6 +45,7 @@ static const char kTestUsageMessage[] = "Custom usage message";
 struct UDT {
   UDT() = default;
   UDT(const UDT&) = default;
+  UDT& operator=(const UDT&) = default;
 };
 bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
 std::string AbslUnparseFlag(const UDT&) { return "UDT{}"; }
diff --git a/absl/flags/parse_test.cc b/absl/flags/parse_test.cc
index 41bc0bc..8dc91db 100644
--- a/absl/flags/parse_test.cc
+++ b/absl/flags/parse_test.cc
@@ -46,6 +46,7 @@ using absl::base_internal::ScopedSetEnv;
 struct UDT {
   UDT() = default;
   UDT(const UDT&) = default;
+  UDT& operator=(const UDT&) = default;
   UDT(int v) : value(v) {}  // NOLINT
 
   int value;