Fixes running 'hg serve' with Windows executable and no explicit template path configured. PY2EXE executables don't support __file__ but do place the directory of the shared code library into sys.prefix. Fixes bug 152.

#!/bin/sh

hg init
echo 123 > a
hg add a
hg commit -m "first" -d "0 0" a
mkdir sub
echo 321 > sub/b
hg add sub/b
hg commit -m "second" -d "0 0" sub/b
cat sub/b
hg co 0
cat sub/b
ls sub

true