See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118779

--- src/package.d.orig	2024-12-28 00:47:59.000000000 -0700
+++ src/package.d	2025-02-07 12:00:00.646094825 -0700
@@ -188,12 +188,12 @@ local maygc object rehash_symtab (object
      first process the symbols, that sit in lists
      (maybe Conses become free): */
   {
-    var gcv_object_t* offset = 0; /* offset = sizeof(gcv_object_t)*index */
+    var aint offset = 0; /* offset = sizeof(gcv_object_t)*index */
     var uintC count = oldsize;
     do {
       var object oldentry = /* entry with number index in oldtable */
         *(gcv_object_t*)(pointerplus(&TheSvector(STACK_2)->data[0],
-                                     (aint)offset));
+                                     offset));
       if (consp(oldentry)) /* this time process only non-empty symbol-lists */
         do {
           pushSTACK(Cdr(oldentry)); /* save rest-list */
@@ -205,22 +205,22 @@ local maygc object rehash_symtab (object
           newinsert(Car(oldentry),newsize);
           oldentry = popSTACK(); /* rest-list */
         } while (consp(oldentry));
-      offset++;
+      offset += sizeof(gcv_object_t);
     } while (--count);
   }
   { /* then process symbols, that sit there collision-free: */
-    var gcv_object_t* offset = 0; /* offset = sizeof(gcv_object_t)*index */
+    var aint offset = 0; /* offset = sizeof(gcv_object_t)*index */
     var uintC count;
     dotimespC(count,oldsize, {
       var object oldentry = /* entry with number index in oldtable */
         *(gcv_object_t*)(pointerplus(&TheSvector(STACK_2)->data[0],
-                                     (aint)offset));
+                                     offset));
       if (!listp(oldentry)) { /* this time process only symbols /= NIL */
         pushSTACK(oldentry); /* dummy, so that the stack is fine */
         newinsert(oldentry,newsize); /* enter into the new table */
         skipSTACK(1);
       }
-      offset++;
+      offset += sizeof(gcv_object_t);
     });
   }
   /* stack layout: tab, oldtable, free-conses, newtable. */