[texhax] `\vtop to 0pt' produces a vertical shift: is that normal?

Rodolfo Medina rodolfo.medina at gmail.com
Sun Jun 21 17:54:43 CEST 2009

With plain TeX: if I put a `\vtop to 0pt{}' after a `\par' command, that
produces a vertical shift, whereas one would expect a vertical box of height
zero to not produce any visible vertical effect at all.

Why does this happen, and how to work it out?

Thanks for any help

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