[translation:ERROR] UnionError: 

Offending annotations:
  SomePtr(ll_ptrtype=<* Struct z_stream { c_next_in, c_avail_in, c__pad0, c__pad1, c__pad2, c__pad3, c_total_in, c_next_out, c_avail_out, c__pad4, c__pad5, c__pad6, c__pad7, c_total_out, c_msg, c__pad8, c__pad9, c__pad10, c__pad11, c__pad12, c__pad13, c__pad14, c__pad15, c_zalloc, c_zfree, c_opaque, c_data_type, c__pad16, c__pad17, c__pad18, c__pad19, c_adler, c_reserved }>)
  SomeNone()


    v955 = call_args((type Decompress), ((0, ('space', 'stream'... False)), space_88, copied_0, v953, v954)

In <FunctionGraph of (pypy.module.zlib.interp_zlib:336)Decompress.copy at 0x55e903ca4720>:
Happened at file /home/manu/vcs/pypy/pypy/module/zlib/interp_zlib.py line 356

                unused_data=self.unused_data,
==>             unconsumed_tail=self.unconsumed_tail,

Known variable annotations:
 space_88 = SomePBC(can_be_None=False, const=StdObjSpace, subset_of=None)
 copied_0 = SomePtr(ll_ptrtype=<* Struct z_stream { c_next_in, c_avail_in, c__pad0, c__pad1, c__pad2, c__pad3, c_total_in, c_next_out, c_avail_out, c__pad4, c__pad5, c__pad6, c__pad7, c_total_out, c_msg, c__pad8, c__pad9, c__pad10, c__pad11, c__pad12, c__pad13, c__pad14, c__pad15, c_zalloc, c_zfree, c_opaque, c_data_type, c__pad16, c__pad17, c__pad18, c__pad19, c_adler, c_reserved }>)
 v953 = SomeString(const='', no_nul=True)
 v954 = SomeString(const='', no_nul=True)

Processing block:
 block@141[copied_0...] is a <class 'rpython.flowspace.flowcontext.SpamBlock'> 
 in (pypy.module.zlib.interp_zlib:336)Decompress.copy 
 containing the following operations: 
       v954 = getattr(self_268, ('unused_data')) 
       v953 = getattr(self_268, ('unconsumed_tail')) 
       v955 = call_args((type Decompress), ((0, ('space', 'stream'... False)), space_88, copied_0, v953, v954) 
 --end--