diff -r 9c10905f4b48 -r 243ecbd4f5c9 mercurial/commands.py
--- a/mercurial/commands.py	Thu Nov 10 09:44:47 2016 -0800
+++ b/mercurial/commands.py	Wed Aug 17 20:59:13 2016 -0700
@@ -1858,51 +1858,6 @@
     with repo.wlock(False):
         return cmdutil.copy(ui, repo, pats, opts)
 
-@command('debugignore', [], '[FILE]')
-def debugignore(ui, repo, *files, **opts):
-    """display the combined ignore pattern and information about ignored files
-
-    With no argument display the combined ignore pattern.
-
-    Given space separated file names, shows if the given file is ignored and
-    if so, show the ignore rule (file and line number) that matched it.
-    """
-    ignore = repo.dirstate._ignore
-    if not files:
-        # Show all the patterns
-        includepat = getattr(ignore, 'includepat', None)
-        if includepat is not None:
-            ui.write("%s\n" % includepat)
-        else:
-            raise error.Abort(_("no ignore patterns found"))
-    else:
-        for f in files:
-            nf = util.normpath(f)
-            ignored = None
-            ignoredata = None
-            if nf != '.':
-                if ignore(nf):
-                    ignored = nf
-                    ignoredata = repo.dirstate._ignorefileandline(nf)
-                else:
-                    for p in util.finddirs(nf):
-                        if ignore(p):
-                            ignored = p
-                            ignoredata = repo.dirstate._ignorefileandline(p)
-                            break
-            if ignored:
-                if ignored == nf:
-                    ui.write(_("%s is ignored\n") % f)
-                else:
-                    ui.write(_("%s is ignored because of "
-                               "containing folder %s\n")
-                             % (f, ignored))
-                ignorefile, lineno, line = ignoredata
-                ui.write(_("(ignore rule in %s, line %d: '%s')\n")
-                         % (ignorefile, lineno, line))
-            else:
-                ui.write(_("%s is not ignored\n") % f)
-
 @command('debugindex', debugrevlogopts +
     [('f', 'format', 0, _('revlog format'), _('FORMAT'))],
     _('[-f FORMAT] -c|-m|FILE'),