[Nix-dev] patch: nix debug coercion failures as xml

[Marc Weber]

Sometimes its hard to understand what's going wrong. Eg you see

      value is an attribute set while a list was expected

This patch prints the attribute set as xml so that you understand faster
what's going wrong:

        <attrs>
          ...
        </attrs> is an attribute set while a list was expected


Do you find it useful as well? Then I'll create a pull request. If not
I'll document that the community has no interest in it - then I know
that I don't have to ask again.

The patch is pretty trivial.
Let me know what you think about it.

Marc Weber
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