[hayley-patton]

> I don't remember seeing it anywhere else, including in Richard Jones' 2006 GC book

Lisp-2 is definitely in both editions of the Handbook, on page 39 in the 2023 edition; though you want to compute the address of the next object before relocating an object in relocate(), else you may overwrite the metadata of the current object [1].

[1] http://gchandbook.org/errata.html