Reimplemented `Append` in terms of `Fold`

* `Fold` already implements the necessary partial specializations for traversing list structures

1 files changed, 1 insertions, 0 deletions

diff --git a/src/list/operation/concatenate.h b/src/list/operation/concatenate.h
index 944470b..a5cbaa6 100644
--- a/src/list/operation/concatenate.h
+++ b/src/list/operation/concatenate.h
@@ -2,6 +2,7 @@
 #define TYPEASVALUE_SRC_LIST_OPERATION_CONCATENATE_H_
 
 #include "append.h"
+#include "higher/remove.h"
 #include "higher/fold.h"
 
 namespace tav {