Greetings, Guile,

Sincere apologies for the late entry.  It's like my school days 
all over again...

Attached is a literate org-mode file which implements an 
"extensible effects" system in Guile.  Extensible effects was 
first implemented in Haskell by Oleg Kiselyov and others[1], and 
as far as I know has not been attempted in Scheme.  It defines a 
metalanguage for writing programs which describe side-effects, and 
handlers which interpret them.

I'd hoped to publish it as a blog post, but technical issues got 
in the way and I didn't want to delay any longer.  I will update 
the list when the post is live; for now this file lives at 
https://git.sr.ht/~wklew/genshou

I hope some folks find it interesting!

Walter

[1] okmij.org/ftp/Haskell/extensible/