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aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=riseup.net header.s=squak header.b=I7YEecQ9; dmarc=fail reason="SPF not aligned (relaxed)" header.from=riseup.net (policy=none); spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: 5.97 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=riseup.net header.s=squak header.b=I7YEecQ9; dmarc=fail reason="SPF not aligned (relaxed)" header.from=riseup.net (policy=none); spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 8A3219A94 X-Spam-Score: 5.97 X-Migadu-Scanner: scn0.migadu.com X-TUID: gRECwots20ng The specific error is this: Wrong number of values returned to continuation (expected 2) It is caused by opam->guix-package silencing intermediate errors by using and-let* (the poor person's Maybe monad) and returning #f when the receiving side expects two return values. Initial reproducer: guix import opam -r mirage Also happens with opam-monorepo. Cc-ing Julien whom might know why the code is structured this way? It's not like the calling side can handle a falsy return and the error is not detected early either, so the user doesn't even know what is causing it. Can I just turn it all into errors? Or maybe we can use the condition system?