missing begin document error with Renderer=Harfbuzz/OpenType

[u-fischer]

Description

Renderer=Harfbuzz and Renderer=OpenType give errors

Check/indicate

• [ x] Relevant for LuaTeX /Harftex
• [x ] Issue tracker has been searched for similar issues?
• Links to <tex.stackexchange.com> discussion if appropriate

Minimal example demonstrating the issue

\documentclass{article}
\usepackage{harfload}
\usepackage{fontspec}

\setmainfont{texgyreheros}[Renderer=OpenType] %or Renderer=Harfbuzz

\begin{document}
blub
\end{document}

Further details

this gives the error (when compiling with harflatex, but also with lualatex)

LaTeX Info: Redefining \emph on input line 3853.
))

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.332 \setmainfont{texgyreheros}[Renderer=OpenType]

[wspr]

Errrr whoops

[u-fischer]

This is no longer relevant as the harfload approach has been superseeded by luahbtex.