Martin Buchholz <martin(a)xemacs.org&gt; writes: Seconded, for now. (Except for the ChangeLog, for which see Jan's mail.) I think we should do that -- use EXTERNAL_LIST_LOOP and GCPRO the tail. XEmacs is already *very* stack-hungry and copies a lot. All unnecessary copying should be avoided. Also, someone could change the characters in the [0, i) range, and relocate string's chars under us by changing the byte length of a character before us. (See set_string_char() and resize_string().)