git stash/unstash fail :-?

#!/bin/bash

TMPREPO=/tmp/.${RANDOM}-git-test
mkdir -p $TMPREPO
cd $TMPREPO

[ "$(uname -s)" == "Darwin" ] && __=''

git init .

echo "foobar" > foobar
git add foobar
git commit -m "Adding foobar"


# Prepend 'bar' to file foobar and stage it
sed -i $__ -e "1i\\
bar
" foobar
git add foobar


# Prepend 'foo' to file foobar and leave it unstaged
sed -i $__ -e "1i\\
foo
" foobar


# Now, there are both unstaged ('foo') AND staged ('bar') changes in foobar.
# Let's stash the temporary work
git stash save --keep-index "Temporary work ('foo')"

# Unstash them and... BOOOM! It fails... :(
git stash pop
echo "----- foobar ------"
cat foobar
echo "----- foobar ------"
rm -rf $TMPREPO