symtable: refactor for SV changes and propagate

src/lisp.c

@@ -71,7 +71,7 @@ lisp_t *make_vec(sys_t *sys, u64 capacity)
 
 lisp_t *intern(sys_t *sys, sv_t sv)
 {
-  char *str = sym_table_find(&sys->symtable, sv);
+  const char *str = sym_table_find(&sys->symtable, sv);
   return tag_sym(str);
 }