Re: [PATCH v2 0/1] MR5968: cmd: Do not set enviroment variable when no input is provided by set /p command.

[eric pouech (＠epo)]

it seems to me this can be tested with:
set /p "myenv=prompt> " < NUL

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https://gitlab.winehq.org/wine/wine/-/merge_requests/5968#note_74869