In fact, it seems to me that sage-4.3.alpha0 is foobar.

After returning to sage-main, I tried to apply a patch:
sage: hg_sage.import_patch('patches/singular_prcopyr_no7577.patch')
cd "/home/SimonKing/sandbox/sage-4.3.alpha0/devel/sage" && hg status
/home/SimonKing/sandbox/sage-4.3.alpha0/local/lib/python2.6/site-
packages/sage/misc/hg.py:240: DeprecationWarning: os.popen3 is
deprecated.  Use the subprocess module.
  x = os.popen3(s)
cd "/home/SimonKing/sandbox/sage-4.3.alpha0/devel/sage" && hg status
cd "/home/SimonKing/sandbox/sage-4.3.alpha0/devel/sage" && hg import
"/home/SimonKing/sandbox/patches/singular_prcopyr_no7577.patch"
abort: outstanding uncommitted changes

OK, a disturbing deprecation warning, and uncommitted changes.
Changes? Not really:
sage: hg_sage.commit()
cd "/home/SimonKing/sandbox/sage-4.3.alpha0/devel/sage" && hg diff  |
less
(END)

# by the way, it did not show me an empty page, it just seemed to do
nothing.
# After hitting "q":
cd "/home/SimonKing/sandbox/sage-4.3.alpha0/devel/sage" && hg commit
nothing changed
sage:

So, nothing changed, but there are uncommitted changes.

Best regards,
Simon

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