tl2020 pretest begin

[Akira Kakuto]

Dear Herbert,

> Strange. For context, this should be
> $TEXMFVAR/luatex-cache/context/...../formats/luatex
>
> The engine for context mkiv is luatex. It is not luahbtex.

Please try:

mtxrun --generate
mtxrun --script base --ini --compile --verbose cont-en

Thanks,
Akira