--- a/mercurial/commands.py	Wed Feb 01 17:39:31 2017 +0100
+++ b/mercurial/commands.py	Wed Feb 01 17:40:20 2017 +0100
@@ -19,7 +19,6 @@
 from .node import (
     bin,
     hex,
-    nullhex,
     nullid,
     nullrev,
     short,
@@ -1863,105 +1862,6 @@
     with repo.wlock(False):
         return cmdutil.copy(ui, repo, pats, opts)
 
-@command('debugmergestate', [], '')
-def debugmergestate(ui, repo, *args):
-    """print merge state
-
-    Use --verbose to print out information about whether v1 or v2 merge state
-    was chosen."""
-    def _hashornull(h):
-        if h == nullhex:
-            return 'null'
-        else:
-            return h
-
-    def printrecords(version):
-        ui.write(('* version %s records\n') % version)
-        if version == 1:
-            records = v1records
-        else:
-            records = v2records
-
-        for rtype, record in records:
-            # pretty print some record types
-            if rtype == 'L':
-                ui.write(('local: %s\n') % record)
-            elif rtype == 'O':
-                ui.write(('other: %s\n') % record)
-            elif rtype == 'm':
-                driver, mdstate = record.split('\0', 1)
-                ui.write(('merge driver: %s (state "%s")\n')
-                         % (driver, mdstate))
-            elif rtype in 'FDC':
-                r = record.split('\0')
-                f, state, hash, lfile, afile, anode, ofile = r[0:7]
-                if version == 1:
-                    onode = 'not stored in v1 format'
-                    flags = r[7]
-                else:
-                    onode, flags = r[7:9]
-                ui.write(('file: %s (record type "%s", state "%s", hash %s)\n')
-                         % (f, rtype, state, _hashornull(hash)))
-                ui.write(('  local path: %s (flags "%s")\n') % (lfile, flags))
-                ui.write(('  ancestor path: %s (node %s)\n')
-                         % (afile, _hashornull(anode)))
-                ui.write(('  other path: %s (node %s)\n')
-                         % (ofile, _hashornull(onode)))
-            elif rtype == 'f':
-                filename, rawextras = record.split('\0', 1)
-                extras = rawextras.split('\0')
-                i = 0
-                extrastrings = []
-                while i < len(extras):
-                    extrastrings.append('%s = %s' % (extras[i], extras[i + 1]))
-                    i += 2
-
-                ui.write(('file extras: %s (%s)\n')
-                         % (filename, ', '.join(extrastrings)))
-            elif rtype == 'l':
-                labels = record.split('\0', 2)
-                labels = [l for l in labels if len(l) > 0]
-                ui.write(('labels:\n'))
-                ui.write(('  local: %s\n' % labels[0]))
-                ui.write(('  other: %s\n' % labels[1]))
-                if len(labels) > 2:
-                    ui.write(('  base:  %s\n' % labels[2]))
-            else:
-                ui.write(('unrecognized entry: %s\t%s\n')
-                         % (rtype, record.replace('\0', '\t')))
-
-    # Avoid mergestate.read() since it may raise an exception for unsupported
-    # merge state records. We shouldn't be doing this, but this is OK since this
-    # command is pretty low-level.
-    ms = mergemod.mergestate(repo)
-
-    # sort so that reasonable information is on top
-    v1records = ms._readrecordsv1()
-    v2records = ms._readrecordsv2()
-    order = 'LOml'
-    def key(r):
-        idx = order.find(r[0])
-        if idx == -1:
-            return (1, r[1])
-        else:
-            return (0, idx)
-    v1records.sort(key=key)
-    v2records.sort(key=key)
-
-    if not v1records and not v2records:
-        ui.write(('no merge state found\n'))
-    elif not v2records:
-        ui.note(('no version 2 merge state\n'))
-        printrecords(1)
-    elif ms._v1v2match(v1records, v2records):
-        ui.note(('v1 and v2 states match: using v2\n'))
-        printrecords(2)
-    else:
-        ui.note(('v1 and v2 states mismatch: using v1\n'))
-        printrecords(1)
-        if ui.verbose:
-            printrecords(2)
-
 @command('debugnamecomplete', [], _('NAME...'))
 def debugnamecomplete(ui, repo, *args):
     '''complete "names" - tags, open branch names, bookmark names'''