clone doesn't work with i_aux custom container

[fonghou]

I'm trying to implement custom i_aux following sample code in documentation e.g.

#define i_aux { MemoryContext memctx; } // NB: enclose in curly braces!
#define i_allocator pgs
#define i_no_clone

I noticed it uses i_no_clone.

I tried to implement a custom allocator (example code below). The code compiles but failed at runtime. In the screenshot, it's clear that Self tmp = {0} didn't copy vec.aux field. Is this a bug or by design (if later, it'd be helpful to issue a warn/error at compile time).

#define i_type     Users
#define i_keyclass User
#define i_use_cmp
#define i_aux { Arena *arena; }
#define i_allocator arena
#include "stc/vec.h"

void test_vec2(Arena a) {
  Users users = {.aux = {&a}};
  Users_push(&users, (User){cstr_lit("mary"), 0});
  Users_push(&users, (User){cstr_lit("joe"), 1});
  Users_push(&users, (User){cstr_lit("admin"), 2});

  Users users2 = Users_clone(users); 
  Users_sort(&users2);

  for (c_each(i, Users, users2))
    printf("%s: %d\n", cstr_str(&i.ref->name), i.ref->id);

  c_drop(Users, &users, &users2);  // cleanup
}

[fonghou]

btw, here is a simple fix.

diff --git a/include/stc/vec.h b/include/stc/vec.h
index cecffb4e..30274ccf 100644
--- a/include/stc/vec.h
+++ b/include/stc/vec.h
@@ -333,6 +333,9 @@ _c_MEMB(_erase_n)(Self* self, const isize idx, const isize len) {
 STC_DEF Self
 _c_MEMB(_clone)(Self vec) {
     Self tmp = {0};
+#ifdef i_aux
+    tmp.aux = vec.aux;
+#endif
     _c_MEMB(_copy_n)(&tmp, 0, vec.data, vec.size);
     vec.data = tmp.data;
     vec.capacity = tmp.capacity;