gnu: All snippets report errors using exceptions, else return #t.

* gnu/packages/admin.scm, gnu/packages/algebra.scm, gnu/packages/audio.scm,
gnu/packages/backup.scm, gnu/packages/base.scm,
gnu/packages/bioinformatics.scm, gnu/packages/cdrom.scm,
gnu/packages/chez.scm, gnu/packages/code.scm, gnu/packages/compression.scm,
gnu/packages/cross-base.scm, gnu/packages/crypto.scm, gnu/packages/cups.scm,
gnu/packages/databases.scm, gnu/packages/dns.scm, gnu/packages/emacs.scm,
gnu/packages/emulators.scm, gnu/packages/engineering.scm,
gnu/packages/enlightenment.scm, gnu/packages/fpga.scm,
gnu/packages/freedesktop.scm, gnu/packages/ftp.scm, gnu/packages/games.scm,
gnu/packages/gcc.scm, gnu/packages/geo.scm, gnu/packages/ghostscript.scm,
gnu/packages/gl.scm, gnu/packages/glib.scm, gnu/packages/gnome.scm,
gnu/packages/gnuzilla.scm, gnu/packages/graphics.scm, gnu/packages/gtk.scm,
gnu/packages/guile.scm, gnu/packages/irc.scm, gnu/packages/java.scm,
gnu/packages/kerberos.scm, gnu/packages/linux.scm, gnu/packages/lisp.scm,
gnu/packages/lxde.scm, gnu/packages/machine-learning.scm,
gnu/packages/mail.scm, gnu/packages/maths.scm, gnu/packages/messaging.scm,
gnu/packages/monitoring.scm, gnu/packages/mp3.scm, gnu/packages/music.scm,
gnu/packages/netpbm.scm, gnu/packages/networking.scm, gnu/packages/node.scm,
gnu/packages/nvi.scm, gnu/packages/ocaml.scm, gnu/packages/pdf.scm,
gnu/packages/perl.scm, gnu/packages/php.scm, gnu/packages/plotutils.scm,
gnu/packages/pretty-print.scm, gnu/packages/profiling.scm,
gnu/packages/pulseaudio.scm, gnu/packages/python-crypto.scm,
gnu/packages/python.scm, gnu/packages/qt.scm, gnu/packages/robotics.scm,
gnu/packages/sawfish.scm, gnu/packages/scanner.scm, gnu/packages/scheme.scm,
gnu/packages/scribus.scm, gnu/packages/sdl.scm,
gnu/packages/serialization.scm, gnu/packages/shells.scm,
gnu/packages/slang.scm, gnu/packages/smalltalk.scm, gnu/packages/ssh.scm,
gnu/packages/sync.scm, gnu/packages/syncthing.scm, gnu/packages/tbb.scm,
gnu/packages/terminals.scm, gnu/packages/texinfo.scm,
gnu/packages/text-editors.scm, gnu/packages/textutils.scm,
gnu/packages/tls.scm, gnu/packages/unrtf.scm,
gnu/packages/version-control.scm, gnu/packages/video.scm,
gnu/packages/vpn.scm, gnu/packages/web.scm, gnu/packages/wm.scm,
gnu/packages/wxwidgets.scm, gnu/packages/xdisorg.scm, gnu/packages/xorg.scm:
In all snippets, report errors using exceptions, or else return #t.

1 files changed, 7 insertions, 5 deletions

diff --git a/gnu/packages/mp3.scm b/gnu/packages/mp3.scm
index 6dc58e2cc8..5904fef8d3 100644
--- a/gnu/packages/mp3.scm
+++ b/gnu/packages/mp3.scm
@@ -120,7 +120,7 @@ versions of ID3v2.")
               "0yfhqwk0w8q2hyv1jib1008jvzmwlpsxvc8qjllhna6p1hycqj97"))
             (modules '((guix build utils)))
             ;; Don't use bundled zlib
-            (snippet '(delete-file-recursively "zlib"))
+            (snippet '(begin (delete-file-recursively "zlib") #t))
             (patches (search-patches "id3lib-CVE-2007-4460.patch"))))
    (build-system gnu-build-system)
    (inputs `(("zlib" ,zlib)))
@@ -192,10 +192,12 @@ Speex, WavPack TrueAudio, WAV, AIFF, MP4 and ASF files.")
                 "042f1czcs9n2sbqvg4rsvfwlqib2gk976mfa2kxlfjghx5laqf04"))
               (modules '((guix build utils)))
               (snippet
-               '(substitute* "Makefile"
-                  (("/bin/rm") "rm")
-                  (("/usr/bin/install") "install")
-                  (("man/man1") "share/man/man1")))))
+               '(begin
+                  (substitute* "Makefile"
+                    (("/bin/rm") "rm")
+                    (("/usr/bin/install") "install")
+                    (("man/man1") "share/man/man1"))
+                  #t))))
     (build-system gnu-build-system)
     (outputs '("out" "gui"))                      ;GTK+ interface in "gui"
     (arguments