[GHC] #14540: IndexError: pop from empty list

[GHC]

#14540: IndexError: pop from empty list
-------------------------------------+-------------------------------------
           Reporter:  Lemming        |             Owner:  hvr
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Trac & Git     |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 ==== How to Reproduce ====

 While doing a GET operation on `/attachment/ticket/14539/`, Trac issued an
 internal error.

 ''(please provide additional details here)''

 Request parameters:
 {{{
 {u'action': u'new', 'path': u'14539/', 'realm': u'ticket'}
 }}}

 User agent: `#USER_AGENT#`

 ==== System Information ====
 ''Systeminformation nicht verfügbar''

 ==== Enabled Plugins ====
 ''Plugininformation nicht verfügbar''

 ==== Interface Customization ====
 ''Interface customization information not available''

 ==== Python Traceback ====
 {{{
 Traceback (most recent call last):
   File "/usr/local/lib/python2.7/dist-packages/trac/web/main.py", line
 623, in _dispatch_request
     dispatcher.dispatch(req)
   File "/usr/local/lib/python2.7/dist-packages/trac/web/main.py", line
 259, in dispatch
     iterable=chrome.use_chunked_encoding)
   File "/usr/local/lib/python2.7/dist-packages/trac/web/chrome.py", line
 1165, in render_template
     encoding='utf-8')
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 184,
 in render
     return encode(generator, method=method, encoding=encoding, out=out)
   File "/usr/local/lib/python2.7/dist-packages/genshi/output.py", line 58,
 in encode
     for chunk in iterator:
   File "/usr/local/lib/python2.7/dist-packages/genshi/output.py", line
 350, in __call__
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/output.py", line
 829, in __call__
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/output.py", line
 669, in __call__
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/output.py", line
 774, in __call__
     for kind, data, pos in chain(stream, [(None, None, None)]):
   File "/usr/local/lib/python2.7/dist-packages/genshi/output.py", line
 594, in __call__
     for ev in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 289,
 in _ensure
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 289,
 in _ensure
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/trac/web/chrome.py", line
 1432, in _strip_accesskeys
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 289,
 in _ensure
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/trac/web/chrome.py", line
 1421, in _generate
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 289,
 in _ensure
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 289,
 in _ensure
     for event in stream:
   File "/usr/local/lib/python2.7/dist-
 packages/genshi/filters/transform.py", line 706, in _unmark
     for mark, event in stream:
   File "/usr/local/lib/python2.7/dist-
 packages/genshi/filters/transform.py", line 1101, in __call__
     for mark, event in stream:
   File "/usr/local/lib/python2.7/dist-
 packages/genshi/filters/transform.py", line 118, in __iter__
     event = self.stream.next()
   File "/usr/local/lib/python2.7/dist-
 packages/genshi/filters/transform.py", line 734, in __call__
     for mark, event in stream:
   File "/usr/local/lib/python2.7/dist-
 packages/genshi/filters/transform.py", line 702, in _mark
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/base.py",
 line 618, in _include
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/markup.py",
 line 378, in _match
     ctxt, start=idx + 1, **vars):
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/markup.py",
 line 378, in _match
     ctxt, start=idx + 1, **vars):
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/markup.py",
 line 362, in _match
     content = list(content)
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/base.py",
 line 618, in _include
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/markup.py",
 line 326, in _match
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/markup.py",
 line 315, in _strip
     event = next()
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/base.py",
 line 558, in _flatten
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 289,
 in _ensure
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/path.py", line 588,
 in _generate
     subevent = next()
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/base.py",
 line 618, in _include
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/markup.py",
 line 315, in _strip
     event = next()
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/base.py",
 line 558, in _flatten
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/core.py", line 289,
 in _ensure
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/path.py", line 588,
 in _generate
     subevent = next()
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/base.py",
 line 618, in _include
     for event in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/markup.py",
 line 315, in _strip
     event = next()
   File "/usr/local/lib/python2.7/dist-packages/genshi/template/base.py",
 line 558, in _flatten
     for kind, data, pos in stream:
   File "/usr/local/lib/python2.7/dist-packages/genshi/filters/i18n.py",
 line 178, in _generate
     for event in msgbuf.translate(gettext(msgbuf.format())):
   File "/usr/local/lib/python2.7/dist-packages/genshi/filters/i18n.py",
 line 1051, in translate
     events = self.events[order].pop(0)
 IndexError: pop from empty list
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14540>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler