Does not compile if user names own document markdown.tex

[mmarras]

This is on Miktex portable, win10:

Issue: Giving my file the name markdown.tex will not compile with (to most users) cryptic error code.
Expected: User should be able to name his file anything he would like (at the very least a hint that file should not be names markdown.tex should be hinted to in the error msg or in the pkg docs)
Reproduce:
Make markdown.tex with the following content and compile (with lualatex):

%%% markdown.tex %%%
\documentclass{article}
\usepackage{markdown}

\begin{document}
test
\end{document}

Error: I read this like the user file is now referencing itself instead to the proper markdown.tex as defined by package.

> > lualatex -synctex=1 -interaction=nonstopmode -file-line-error --shell-escape markdown
> 
> This is LuaHBTeX, Version 1.13.0 (MiKTeX 21.1 Portable)
>  system commands enabled.
> (./markdown.tex
> LaTeX2e <2020-10-01> patch level 4
>  L3 programming layer <2021-01-09> xparse <2020-03-03>
> (C:/Users/######/MikTex/texmfs/install/tex/latex/base/article.cls
> Document Class: article 2020/04/10 v1.4m Standard LaTeX document class

[...]

> (C:/Users/######/MikTex/texmfs/install/tex/generic/gobble/gobble.tex))
> (./markdown.tex
> 
> ./markdown.tex:2: LaTeX Error: Two \documentclass or \documentstyle commands.
> 
> See the LaTeX manual or LaTeX Companion for explanation.
> Type  H <return>  for immediate help.
>  ...                                              
>                                                   
> l.2 \documentclass{
>                  article}
> 
> ./markdown.tex:4: LaTeX Error: \RequirePackage or \LoadClass in Options Section
> .
> 
> See the LaTeX manual or LaTeX Companion for explanation.
> Type  H <return>  for immediate help.
>  ...                                              
>                                                   
> l.4 
>   
> 
> (C:/Users/######/MikTex/texmfs/install/tex/latex/l3backend/l3backend-luatex.def
> ) (./markdown.aux)
> (C:/Users/######/MikTex/texmfs/install/tex/latex/base/ts1cmr.fd)
> (C:/Users/######/MikTex/texmfs/install/tex/context/base/mkii/supp-pdf.mkii
> [Loading MPS to PDF converter (version 2006.09.02).]
> )
> 
> ./markdown.tex:5: LaTeX Error: \RequirePackage or \LoadClass in Options Section
> .
> 
> See the LaTeX manual or LaTeX Companion for explanation.
> Type  H <return>  for immediate help.
>  ...                                              
>                                                   
> l.5 \begin{document}
>                   
> [1{C:/Users/######/MikTex/texmfs/data/pdftex/config/pdftex.map}]
> 
> ./markdown.tex:7: Package hooks Error: Missing \PopDefaultHookLabel.
> (hooks)                The label `markdown' was pushed but never popped.
> (hooks)                Something is wrong.
> 
> Type <return> to continue.
>  ...                                              
>                                                   
> l.7 \end{document}
>                 
> (./markdown.aux))))
> (\end occurred when \ifx on line 4 was incomplete)
> (see the transcript file for additional information)
>  418 words of node memory still in use:
>    3 hlist, 1 vlist, 1 rule, 2 glue, 3 kern, 1 glyph, 5 attribute, 49 glue_spec
> , 5 attribute_list, 2 write nodes
>    avail lists: 2:23,3:3,4:1,5:21,6:2,7:42,9:22
> <//?/c:/users/######/miktex/texmfs/install/fonts/opentype/public/lm/lmroman10-r
> egular.otf>
> Output written on markdown.pdf (1 page, 3340 bytes).
> SyncTeX written on markdown.synctex.gz.
> Transcript written on markdown.log.

[Witiko]

Sorry for the trouble and thanks for the report. Your issue should be fixed by cb50d48.