builtins.toXML generates self-closing tags where it shouldn't

builtins.toXML {}

cppnix:

<?xml version='1.0' encoding='utf-8'?>
<expr>
  <attrs>
  </attrs>
</expr>

tvix:

<?xml version='1.0' encoding='utf-8'?>
<expr>
  <attrs />
</expr>

1. qyliss updated the body of this issue at 2024-04-09T10·04+00

2. With cppnix, some elements are self-closing, but not all — int is self-closing, but attrs never is.

   xml-rs doesn't support varying whether empty elements are self-closing except with a global setting, so either xml-rs has to be changed to implement this, or XML generation has to be implemented in a different way.

   This came up for me in the context of grub-config.xml in NixOS.

   qyliss at 2024-04-09T14·23+00