transactions: avoid late tear-down (issue641)
We use weak references (ugh) to avoid having to manually delete
transaction references out of each call frame when an exception occurs.
#!/bin/sh
echo "[extensions]" >> $HGRCPATH
echo "patchbomb=" >> $HGRCPATH
hg init
echo a > a
hg commit -Ama -d '1 0'
hg email --date '1970-1-1 0:1' -n -f quux -t foo -c bar tip | \
sed -e 's/\(Message-Id:.*@\).*/\1/'
echo b > b
hg commit -Amb -d '2 0'
hg email --date '1970-1-1 0:2' -n -f quux -t foo -c bar -s test 0:tip | \
sed -e 's/\(Message-Id:.*@\).*/\1/' | \
sed -e 's/\(In-Reply-To:.*@\).*/\1/'
hg email -m test.mbox -f quux -t foo -c bar -s test 0:tip