Dub Error Message "Invalid variable: DUB"

[Paul Backus]

On Sunday, 7 June 2020 at 12:52:12 UTC, Andre Pany wrote:
>
> I am not sure but $DUB is a variable which could be used in dub 
> descriptor file but it isn't an environment variable.
>
> $DUB_EXE is an environment variable.
>
> Kind regards
> Andre

If what you say is true, the Dub documentation needs to be 
updated:

https://dub.pm/package-format-json.html#environment-variables