Index: src/libcfa/bits/containers.h
===================================================================
--- src/libcfa/bits/containers.h	(revision c24ef9d02d48a8d5d71e71d8ccad0aec0a769fb6)
+++ src/libcfa/bits/containers.h	(revision 0c674e80fb16ad200b53123b9c7451e3a60db3ae)
@@ -186,6 +186,6 @@
 
 	forall(dtype T | is_node(T))
-	static inline bool ?!=?( __queue(T) & this, zero_t zero ) with( this ) {
-		return head != 0;
+	static inline bool ?!=?( __queue(T) & this, zero_t zero ) {
+		return this.head != 0;
 	}
 #endif
@@ -266,4 +266,9 @@
 		__get( node ).prev = NULL;
 	}
+
+	forall(dtype T | sized(T))
+	static inline bool ?!=?( __dllist(T) & this, zero_t zero ) {
+		return this.head != 0;
+	}
 	#undef next
 	#undef prev