1 files changed, 4 insertions, 2 deletions
diff --git a/src/u16.hh b/src/u16.hh
index c23a366..781e6a4 100644
--- a/src/u16.hh
+++ b/src/u16.hh
@@ -1,12 +1,13 @@
 #ifndef U16_HH
 #define U16_HH
 
+#include "u.hh" // IWYU pragma: export
+
 #include <cstdint> // IWYU pragma: export
 #include <expected>
 #include <iterator>
 #include <type_traits>
-
-#include "u.hh" // IWYU pragma: export
+#include <utility>
 
 namespace u16 {
 
@@ -49,6 +50,7 @@ std::expected<uint32_t, u::ReadErrorReplace> read_replace(T& start,
     case u::ReadError::Invalid:
       return 0xfffd;
   }
+  std::unreachable();
 }
 
 template<std::forward_iterator T>