[translation:info] Error:
   File "/h/nate/research/pypy/rpython/translator/goal/translate.py", line 318, in main
    drv.proceed(goals)
   File "/h/nate/research/pypy/rpython/translator/driver.py", line 551, in proceed
    result = self._execute(goals, task_skip = self._maybe_skip())
   File "/h/nate/research/pypy/rpython/translator/tool/taskengine.py", line 114, in _execute
    res = self._do(goal, taskcallable, *args, **kwds)
   File "/h/nate/research/pypy/rpython/translator/driver.py", line 278, in _do
    res = func()
   File "/h/nate/research/pypy/rpython/translator/driver.py", line 361, in task_pyjitpl_lltype
    backend_name=self.config.translation.jit_backend, inline=True)
   File "/h/nate/research/pypy/rpython/jit/metainterp/warmspot.py", line 72, in apply_jit
    warmrunnerdesc.finish()
   File "/h/nate/research/pypy/rpython/jit/metainterp/warmspot.py", line 288, in finish
    self.annhelper.finish()
   File "/h/nate/research/pypy/rpython/rtyper/annlowlevel.py", line 218, in finish
    self.finish_annotate()
   File "/h/nate/research/pypy/rpython/rtyper/annlowlevel.py", line 238, in finish_annotate
    ann.complete_helpers()
   File "/h/nate/research/pypy/rpython/annotator/annrpython.py", line 116, in complete_helpers
    self.complete()
   File "/h/nate/research/pypy/rpython/annotator/annrpython.py", line 201, in complete
    self.complete_pending_blocks()
   File "/h/nate/research/pypy/rpython/annotator/annrpython.py", line 196, in complete_pending_blocks
    self.processblock(graph, block)
   File "/h/nate/research/pypy/rpython/annotator/annrpython.py", line 376, in processblock
    self.flowin(graph, block)
   File "/h/nate/research/pypy/rpython/annotator/annrpython.py", line 472, in flowin
    new_ops = op.transform(self)
   File "/h/nate/research/pypy/rpython/flowspace/operation.py", line 113, in transform
    args_s = [annotator.annotation(arg) for arg in self.args]
   File "/h/nate/research/pypy/rpython/annotator/annrpython.py", line 250, in annotation
    return self.bookkeeper.immutablevalue(arg.value)
   File "/h/nate/research/pypy/rpython/annotator/bookkeeper.py", line 328, in immutablevalue
    result = SomePBC([self.getdesc(x)])
   File "/h/nate/research/pypy/rpython/annotator/bookkeeper.py", line 403, in getdesc
    raise Exception("%s: %r" % (msg, pyobj))
[translation:ERROR] Exception: object with a __call__ is not RPython: <built-in function pack>
Processing block:
 block@15[eax_0...] is a <class 'rpython.flowspace.flowcontext.SpamBlock'>
 in (rpython.jit.backend.x86.detect_feature:23)cpu_id
 containing the following operations:
       v47 = simple_call((builtin_function_or_method pack), ('<I'), eax_0)
       asm_0 = newlist(('\xb8'), v47, ('S'), ('\x0f\xa2'), ('['))
       v48 = bool(ret_edx_0)