fix(tvix/nix-compat-derive): Better errors for default r/8892

This adds a span to default handling so that any error message
gives a more precise location as a hint for why the error occurred
instead of just pointing to the type.

Change-Id: I7bf6cf38e0284f9726d670ea50a94a6b1edd8a94
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12728
Reviewed-by: Vladimir Kryachko <v.kryachko@gmail.com>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: Brian Olsen <me@griff.name>

0 files changed, 0 insertions, 0 deletions