Efraim Flashner <efr...@flashner.co.il> skribis: > On Mon, Oct 17, 2016 at 10:50:36AM +0200, Ludovic Courtès wrote: >> Hi, >> >> Ricardo Wurmus <rek...@elephly.net> skribis: >> >> > it happened a couple of times already that a “substitute*” expression >> > silently failed and I only found out about it when investigating the >> > remains of a failing build (“guix build -K”). This can easily happen >> > when a package is updated and substitutions “anchors” no longer exist in >> > the updated source code. >> > >> > Would it be desirable to change “substitute*” (or replace it) such that >> > it throws an error or returns a value if substitution failed? >> >> “Failed” as in “there were no pattern matches”, right? >> > > Or as in "your regex was bad, try again"
That already happens. Ludo’.
