After I updated my TL2016 (Windows) environment (10 minutes ago) compiling documents containing for example \d{e}
or \d e
throws an error message. The following MWE should demonstrate this:
\documentclass{book}
\usepackage{fontspec}
\usepackage[%
main=english,
]{babel}%
\begin{document}
\chapter{How to place a dot below for example: e?}
\d e
The command throws the error messages:\\
Extra \textbackslash{}else. \textbackslash{}d e\\
Extra \textbackslash{}fi. \textbackslash{}d e
\end{document}