I broke up with neovim....vim is my best friend now

dot_vim/plugged/vimtex/test/test-completion-labels/test2.tex

@@ -0,0 +1,10 @@
+\documentclass{article}
+\usepackage{xr}
+\externaldocument{test2/input1}
+\externaldocument[1-]{test2/input2}
+\begin{document}
+
+It would be great to be able to use omnicomplete in this file in order to
+reference equations, e.g.~\ref{eq_1} and \ref{1-eq_2}.
+
+\end{document}