How to add support for a single missing character?

Question

I keep getting this error:

[WARNING] Missing character: There is no ❯ (U+276F) (U+276F) in font Roboto Mono Nerd Font Complet

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Is there any way to add support for this entire font, or at least for this one character ?

I use xelatex btw.

Answer 1

I'd use newunicodechar, but in a different way than David's, that is, using a substitute font.

\tracinglostchars=3
\documentclass{article}
\usepackage{fontspec}
\usepackage{newunicodechar}

\setmonofont{Roboto Mono}
\newfontfamily{\substitutett}{DejaVu Sans Mono}
\newunicodechar{❮}{\makebox[0.5em]{\substitutett❮}}
\newunicodechar{❯}{\makebox[0.5em]{\substitutett❯}}

\begin{document}

\texttt{❮abc❯}

\end{document}

Answer 2

You can use newunicodechar package to make the characters active and fake however you wish, here I use a bold U+203A

\documentclass{article}

\usepackage{newunicodechar}

\newunicodechar{❮}{\textbf{‹}}
\newunicodechar{❯}{\textbf{›}}

\begin{document}


‹this 1›

\textbf{‹}this 2\textbf{›}

❮this 3❯ 


\end{document}