for compatibility with gcc 9.4

src/datablock.cpp

@@ -205,12 +205,12 @@ namespace
 	using cat_order_t = std::vector<elem_t>;
 	using iter_t = cat_order_t::iterator;
 
-	constexpr inline int get_count(iter_t i)
+	inline int get_count(iter_t i)
 	{
 		return std::get<1>(*i);
 	}
 
-	constexpr inline bool is_on_stack(iter_t i)
+	inline bool is_on_stack(iter_t i)
 	{
 		return std::get<2>(*i);
 	}
@@ -242,7 +242,7 @@ namespace
 
 		count = parent_count + 1;
 	}
-}
+} // namespace
 
 void datablock::write(std::ostream &os) const
 {