Am So., 12. Okt. 2025 um 22:16 Uhr schrieb Daphne Preston-Kendal
<xxxxxx@nonceword.org>:

> Chez Scheme added keep-live in version 10, but it had ephemerons and other weak references long before. Its documentation suggests the purpose of keep-live is related to the ‘immobile objects’ feature, not to the re-ordering optimization you are concerned about.

One more note about that: Racket uses "keep-live" in its
implementation of ephemerons for exactly the same purpose as
"reference-barrier" is in this SRFI. It is a wrong belief that the
purpose of "keep-live" is only related to the "immobile objects"
feature. (Many of the recent additions to the Chez Scheme programming
language have their origins in the demands of Racket CS, so CS code
used by Racket matters.)