gistfile1.txt

[nix-shell:~/projects/github.com/NixOS/nixpkgs/doc]$ make debug
nix-shell --run "xmloscopy --docbook5 ./manual.xml ./manual-full.xml"
trace: `mkStrict' is obsolete; use `mkOverride 0' instead.
trace: `lib.nixpkgsVersion` is deprecated, use `lib.version` instead!
trace: Warning: `showVal` is deprecated and will be removed in the next release, please use `traceSeqN`
trace: lib.zip is deprecated, use lib.zipAttrsWith instead
    Feasability check on files without xincludes...

A document is feasibly valid if it could be transformed into a valid
document by inserting any number of attributes and child elements
anywhere in the tree.

This is equivalent to pretending every element is optional.

This option may be useful while a document is still under
construction.

This option also disables checking that references are valid.
./contributing.xml: OK
./package-notes.xml: OK
./coding-conventions.xml: OK

[snip]

./overlays.xml: OK
./stdenv.xml: Not feasibly valid:
Line 2769:
  2766	      </para>
  2767	     </listitem>
  2768	    </varlistentry>
  2769	    <variablelist>
  2770	     <title>Variables controlling Meson</title>
  2771	     <varlistentry>
  2772	      <term>
     error: element "variablelist" not
    allowed here; expected the element
    end-tag or element "varlistentry"