Maybe because a ^^^^ requires xxxx, for example, 0003.
See line 1506 in file
/context/tex/texmf-context/tex/context/base/mkiv/syst-aux.mkiv
Luis Montgomery
On the first run of MkIV (context --luatex) after updating my installation
> on Win11-x64, I get a complaint just after loading
> .../base/mkiv/syst-mac-lua :
>
> open source > level 1, order 11, name
> 'C:/ConTeXt_LMTX/tex/texmf-context/tex/context/base/mkiv/syst-aux.mkiv'
> resolvers > lua > loading file
> 'C:/ConTeXt_LMTX/tex/texmf-context/tex/context/base/mkiv/syst-aux.lua'
> succeeded
> resolvers > lua > loading file
> 'C:/ConTeXt_LMTX/tex/texmf-context/tex/context/base/mkiv/syst-mac.lua'
> succeeded
> ! ^^^^ needs four hex digits.
> l.1506 {\unless\ifx##2^
> ^^^3}%
> ?
>
> If I let the build proceed, all seems to be well.
> --
> Rik
>
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