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aspmx1.migadu.com; dkim=pass header.d=tugraz.at header.s=mailrelay header.b=AGS8CXOz; dmarc=pass (policy=none) header.from=tugraz.at; spf=pass (aspmx1.migadu.com: domain of "gwl-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="gwl-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -7.72 Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=tugraz.at header.s=mailrelay header.b=AGS8CXOz; dmarc=pass (policy=none) header.from=tugraz.at; spf=pass (aspmx1.migadu.com: domain of "gwl-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="gwl-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: CDABC2D4E1 X-Spam-Score: -7.72 X-Migadu-Scanner: scn0.migadu.com X-TUID: FTS/xR8kUsbl Hi Guix, using this rather simple workflow --8<---------------cut here---------------start------------->8--- use-modules : gnu packages base process greet packages hello # { hello } workflow simple-wisp processes list greet --8<---------------cut here---------------end--------------->8--- I get the following error: --8<---------------cut here---------------start------------->8--- Backtrace: In guix/gexp.scm: 893:4 19 (_ _) In guix/store.scm: 2053:12 18 (_ #) 1380:11 17 (map/accumulate-builds # …) 1298:8 16 (call-with-build-handler # …) 2168:25 15 (run-with-store # …) In guix/gexp.scm: 898:13 14 (_ _) In guix/store.scm: 1996:8 13 (_ _) In guix/gexp.scm: 300:22 12 (_ _) In guix/profiles.scm: 1935:2 11 (_ _) In guix/store.scm: 2053:12 10 (_ #) 1380:11 9 (map/accumulate-builds # …) 1298:8 8 (call-with-build-handler # …) 2168:25 7 (run-with-store # …) In guix/gexp.scm: 1181:2 6 (_ _) 1047:2 5 (_ _) 1388:2 4 (_ _) In guix/monads.scm: 471:9 3 (_ _) 471:9 2 (_ _) In guix/gexp.scm: 332:25 1 (_ _) In ice-9/boot-9.scm: 1685:16 0 (raise-exception _ #:continuable? _) ice-9/boot-9.scm:1685:16: In procedure raise-exception: ERROR: 1. &derivation-missing-output-error: derivation: # /gnu/store/s5pd3rnzymliafb4la5sca63j86xs0y0-hello-2.12.1 7f0d3ba40af0> output: #f --8<---------------cut here---------------end--------------->8--- I'd hazard a guess this has to do with the recently added support for outputs. Note that attempting to specify an output --8<---------------cut here---------------start------------->8--- process greet packages list : list hello "out" # { hello } --8<---------------cut here---------------end--------------->8--- results in a different error --8<---------------cut here---------------start------------->8--- ice-9/boot-9.scm:1752:10: error: type error: expected one of `' `' `', but got `' in `(# out)' --8<---------------cut here---------------end--------------->8--- Thus, there is no way to use plain packages with GWL 0.5. Cheers