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revlog: fix pure version of _partialmatch() to include nullid...

revlog: fix pure version of _partialmatch() to include nullid Before this patch, test-issue842.t and a few more tests fail when they try to refer to the null revision by using a "000.." prefix of it (or because they use the "shortest" template function which internally does that). This should have been part of my (index: don't allow index[len(index)] to mean nullid, 2018-07-20), but I had forgotten to update another part of the pure code there, so it didn't fail until (parsers: adjust pure-python version to mimic a3dacabd476b, 2018-08-09) and (revlog: fix pure nodemap to not access missing index entry, 2018-08-17) fixed the other things I had missed. Differential Revision: https://phab.mercurial-scm.org/D4332

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      # showstack.py - extension to dump a Python stack trace on signal

      #

      # binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)

      """dump stack trace when receiving SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)

      """

      from __future__ import absolute_import

      import signal

      import sys

      import traceback

      def sigshow(*args):

          sys.stderr.write("\n")

          traceback.print_stack(args[1], limit=10, file=sys.stderr)

          sys.stderr.write("----\n")

      def extsetup(ui):

          signal.signal(signal.SIGQUIT, sigshow)

          try:

              signal.signal(signal.SIGINFO, sigshow)

          except AttributeError:

              pass

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				# showstack.py - extension to dump a Python stack trace on signal
				#
				# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
				"""dump stack trace when receiving SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
				"""

				from __future__ import absolute_import
				import signal
				import sys
				import traceback

				def sigshow(*args):
				sys.stderr.write("\n")
				traceback.print_stack(args[1], limit=10, file=sys.stderr)
				sys.stderr.write("----\n")

				def extsetup(ui):
				signal.signal(signal.SIGQUIT, sigshow)
				try:
				signal.signal(signal.SIGINFO, sigshow)
				except AttributeError:
				pass