This is MetaPost, version 1.999 (TeX Live 2015/Debian) (kpathsea version 6.2.1)  19 APR 2020 22:29
**grid.mp
(/usr/share/texlive/texmf-dist/metapost/base/mpost.mp
(/usr/share/texlive/texmf-dist/metapost/base/plain.mp
Preloading the plain mem file, version 1.005) ) (./grid.mp
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 ..{-4096,0}(20.15991,0){-4096,0}
 ..{-4096,0}(0,10.07996){-4096,0}
 ..{4096,0}cycle

Path at line 2, after choices:
(0,0)..controls (7.93185,0) and (12.22806,10.07996)
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 [1] )
1 output file written: grid.ps