diff -r 309e8b08c60e -r 55cc3b373c5e src/list.c
--- a/src/list.c	Mon Jan 23 20:34:18 2023 +0100
+++ b/src/list.c	Wed Jan 25 19:19:29 2023 +0100
@@ -28,6 +28,8 @@
 
 #include "cx/list.h"
 
+#include <string.h>
+
 void cxListDestroy(CxList *list) {
     switch (list->content_destructor_type) {
         case CX_DESTRUCTOR_SIMPLE: {
@@ -80,3 +82,16 @@
         }
     }
 }
+
+CxMutIterator cxListMutIterator(
+        CxList *list,
+        size_t index
+) {
+    CxIterator it = list->cl->iterator(list, index);
+    it.base.mutating = true;
+
+    // we know the iterators share the same memory layout
+    CxMutIterator iter;
+    memcpy(&iter, &it, sizeof(CxMutIterator));
+    return iter;
+}