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arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Scanner: scn0.migadu.com X-TUID: Jypmvq5gcpnz Hello, >>> +@example >>> +#!/usr/bin/env -S guix shell python python-nympy -- python3 >>> +@end example Apparently, according to POSIX you're only allowed one argument on the '#!' line after the path of the executable. I haven't confirmed this myself but it is in the guile manual, section 4.3.2 "The Meta Switch". One argument does seem quite limiting though so I wonder if anyone actually imposes that limit. Morgan