bug#54750: (gnu packages racket) assumes that (ice-9 exceptions) exist, breaks pulling from old Guix

[Ludovic Courtès]

Hi,

For some reason I had not seen this issue earlier; too bad it remained
for this long.

This is now fixed in 8918ce6d1622303465e716ae491b8e5124c7aece.

Thanks,
Ludo’.