diff -r 2e8878770de0 -r 8aea65ae1eaf src/linked_list.c
--- a/src/linked_list.c	Sun Mar 06 13:57:36 2022 +0100
+++ b/src/linked_list.c	Sat Apr 09 16:37:43 2022 +0200
@@ -40,7 +40,7 @@
 #define ll_data(node) (follow_ptr?CX_LL_PTR(node, loc_data):(((char*)node)+loc_data))
 
 void *cx_linked_list_at(
-        void *start,
+        void const *start,
         size_t start_index,
         ptrdiff_t loc_advance,
         size_t index
@@ -48,12 +48,12 @@
     assert(start != NULL);
     assert(loc_advance >= 0);
     size_t i = start_index;
-    void *cur = start;
+    void const *cur = start;
     while (i != index && cur != NULL) {
         cur = ll_advance(cur);
         i < index ? i++ : i--;
     }
-    return cur;
+    return (void *) cur;
 }
 
 size_t cx_linked_list_find(
@@ -83,42 +83,42 @@
 }
 
 void *cx_linked_list_first(
-        void *node,
+        void const *node,
         ptrdiff_t loc_prev
 ) {
     return cx_linked_list_last(node, loc_prev);
 }
 
 void *cx_linked_list_last(
-        void *node,
+        void const *node,
         ptrdiff_t loc_next
 ) {
     assert(node != NULL);
     assert(loc_next >= 0);
 
-    void *cur = node;
-    void *last;
+    void const *cur = node;
+    void const *last;
     do {
         last = cur;
     } while ((cur = ll_next(cur)) != NULL);
 
-    return last;
+    return (void *) last;
 }
 
 void *cx_linked_list_prev(
-        void *begin,
+        void const *begin,
         ptrdiff_t loc_next,
-        void *node
+        void const *node
 ) {
     assert(begin != NULL);
     assert(node != NULL);
     assert(loc_next >= 0);
     if (begin == node) return NULL;
-    void *cur = begin;
-    void *next;
+    void const *cur = begin;
+    void const *next;
     while (1) {
         next = ll_next(cur);
-        if (next == node) return cur;
+        if (next == node) return (void *) cur;
         cur = next;
     }
 }
@@ -294,6 +294,7 @@
     const size_t sbo_len = 1024;
     void *sbo[sbo_len];
     void **sorted = (length >= sbo_len) ? malloc(sizeof(void *) * length) : sbo;
+    if (sorted == NULL) abort();
     void *rc, *lc;
 
     lc = ls;
@@ -772,7 +773,7 @@
 }
 
 CxList *cxLinkedListCreate(
-        CxAllocator *allocator,
+        CxAllocator const *allocator,
         CxListComparator comparator,
         size_t item_size
 ) {
@@ -791,7 +792,7 @@
 }
 
 CxList *cxPointerLinkedListCreate(
-        CxAllocator *allocator,
+        CxAllocator const *allocator,
         CxListComparator comparator
 ) {
     cx_linked_list *list = cxCalloc(allocator, 1, sizeof(cx_linked_list));
@@ -809,7 +810,7 @@
 }
 
 CxList *cxLinkedListFromArray(
-        CxAllocator *allocator,
+        CxAllocator const *allocator,
         CxListComparator comparator,
         size_t item_size,
         size_t num_items,