Static assert that LiteralStringRef arg is literal string

flow/Arena.h

@@ -662,7 +662,15 @@ struct Traceable<Standalone<T>> : std::conditional<Traceable<T>::value, std::tru
 	static std::string toString(const Standalone<T>& value) { return Traceable<T>::toString(value); }
 };
 
-#define LiteralStringRef(str) StringRef((const uint8_t*)(str), sizeof((str)) - 1)
+namespace literal_string_ref {
+template <class T, int Size>
+StringRef LiteralStringRefHelper(const char* str) {
+	static_assert(std::is_same_v<T, const char(&)[Size]>, "Argument to LiteralStringRef must be a literal string");
+	return StringRef(reinterpret_cast<const uint8_t*>(str), Size);
+}
+} // namespace literal_string_ref
+#define LiteralStringRef(str) literal_string_ref::LiteralStringRefHelper<decltype(str), sizeof(str)>(str)
+
 inline StringRef operator"" _sr(const char* str, size_t size) {
 	return StringRef(reinterpret_cast<const uint8_t*>(str), size);
 }