prep unstable sid
mktag
mustfail 'push is missing tag ref update' $push_spec1
-mustfail 'push is missing head ref update' $push_spec2
+mustfail 'push is missing head ref update' +$push_spec2
mustfail 'pushing unexpected ref' $push_spec HEAD:refs/wombat
mustfail 'pushing multiple heads' $push_spec HEAD:refs/dgit/wombat
mustfail 'pushing multiple tags' $push_spec HEAD:refs/tags/debian/wombat
mustsucceed $push_spec # succeeds
mktag
-mustfail 'push is missing head ref update' $push_spec
+mustfail 'push is missing head ref update' $push_spec1 +$push_spec2
git commit --allow-empty -m 'Dummy update'
mktag
-mustfail 'not replacing previously-pushed version' $push_spec
+mustfail 'not replacing previously-pushed version' +$push_spec1 +$push_spec2
git reset --hard HEAD~
prep_dm_mangle () {