Get ready for release 2.11.2

Looks like Python 2.4-2.6 may have a COME_FROM(_LOOP)
before the jump_back.

Fixes Issue #123

ChangeLog

@@ -1,3 +1,46 @@
+2017-07-09  rocky <rb@dustyfeet.com>
+
+	* HOW-TO-REPORT-A-BUG.md, uncompyle6/version.py: Get ready for
+	release 2.11.2
+
+2017-07-08  rocky <rb@dustyfeet.com>
+
+	* __pkginfo__.py, uncompyle6/scanner.py,
+	uncompyle6/scanners/scanner2.py, uncompyle6/scanners/scanner26.py,
+	uncompyle6/scanners/scanner3.py, uncompyle6/scanners/scanner30.py,
+	uncompyle6/scanners/tok.py: Use xdis 3.5.0's opcode sets
+
+2017-07-08  rocky <rb@dustyfeet.com>
+
+	* test/test_pyenvlib.py, uncompyle6/scanners/pypy32.py,
+	uncompyle6/scanners/pypy35.py, uncompyle6/scanners/scanner15.py,
+	uncompyle6/scanners/scanner32.py, uncompyle6/scanners/scanner34.py,
+	uncompyle6/scanners/scanner35.py, uncompyle6/scanners/scanner36.py: 
+	Start supporting Pypy 3.5 (5.7.1-beta)
+
+2017-07-05  rocky <rb@dustyfeet.com>
+
+	* test/simple_source/bug26/03_loop_if_cf.py,
+	uncompyle6/parsers/parse26.py: Loops in Python 2.4-2.6 loop
+	come_from Looks like Python 2.4-2.6 may have a COME_FROM(_LOOP) before the
+	jump_back.  Fixes Issue #123
+
+2017-06-29  rocky <rb@dustyfeet.com>
+
+	* : Work around not having real flow-control analysis
+
+2017-06-28  rocky <rb@dustyfeet.com>
+
+	* uncompyle6/semantics/make_function.py: A guard against badly
+	formated bytecode
+
+2017-06-25  rocky <rb@dustyfeet.com>
+
+	* ChangeLog, NEWS, test/simple_source/bug31/04_def_annotate.py,
+	uncompyle6/semantics/make_function.py,
+	uncompyle6/semantics/pysource.py: 3.x funciton and annotation bug
+	fixes
+
 2017-06-25  rocky <rb@dustyfeet.com>
 
 	* uncompyle6/version.py: Get ready for release 2.11.1

HOW-TO-REPORT-A-BUG.md

@@ -19,7 +19,7 @@ So it is likely you'll find a mistranslation in decompiling.
 The basic requirement is pretty simple:
 
 * Python bytecode
-* Source text
+* Python source text
 
 ## What to send (additional helpful information)
 
@@ -50,7 +50,7 @@ one fool can learn, so can another."
 
 ## Narrowing the problem
 
-I don't need the entire source code base for which one file or module
+I don't need or want the entire source code base for which one file or module
 can't be decompiled. I just need that one file or module only. If
 there are several files, file a bug report for each file.
 

NEWS

@@ -1,10 +1,17 @@
-uncompyle6 2.11.1 2016-06-22
+uncompyle6 2.11.2 2017-07-09
 
-- Python 3.x annotatoin and function signature fixes
+- Start supporting Pypy 3.5 (5.7.1-beta)
+- use xdis 3.5.0's opcode sets and require xdis 3.5.0
+- Correct some Python 2.4-2.6 loop detection
+- guard against badly formatted bytecode
+
+uncompyle6 2.11.1 2017-06-25
+
+- Python 3.x annotation and function signature fixes
 - Bump xdis version
 - Small pysource bug fixes
 
-uncompyle6 2.11.0 2016-06-18 Fleetwood
+uncompyle6 2.11.0 2017-06-18 Fleetwood
 - Major improvements in fragment tracking
   * Add nonterminal node in extractInfo
   * tag more offsets in expressions
@@ -14,17 +21,17 @@ uncompyle6 2.11.0 2016-06-18 Fleetwood
 - Fixes yet again for make_function node handling; document what's up here
 - Fix bug in snowflake Python 3.5 *args kwargs
 
-uncompyle6 2.10.1 2016-06-3 Marylin Frankel
+uncompyle6 2.10.1 2017-06-3 Marylin Frankel
 
 - fix some fragments parsing bugs
   - was returning the wrong type sometimes in deparse_code_around_offset()
   - capture function name in offsets
   - track changes to ifelstrmtr node from pysource into fragments
 
-uncompyle6 2.10.0 2016-05-30 Elaine Gordon
+uncompyle6 2.10.0 2017-05-30 Elaine Gordon
 
-- Add fuzzy offset deparse lookup
-- 3.6 bugfixes
+- Add fuzzy offset deparse look up
+- 3.6 bug fixes
    - fix EXTENDED_ARGS handling (and in 2.6 and others)
    - semantic routine make_function fragments.py
    - MAKE_FUNCTION handling
@@ -35,19 +42,19 @@ uncompyle6 2.10.0 2016-05-30 Elaine Gordon
 - 3.5 FUNCTION_VAR bug
 - 3.x pass statement insdie while True
 - Improve 3.2 decompilation
-- Fixed -o argument processing (Gregrory)
+- Fixed -o argument processing (grkov90)
 - Reduce scope of LOAD_ASSERT as expr to 3.4+
 - "await" statement fixes
 - 2.3, 2.4 "if 1 .." fixes
 - 3.x annotation fixes
 
-uncompyle6 2.9.11 2016-04-06
+uncompyle6 2.9.11 2017-04-06
 
 - Better support for Python 3.5+ BUILD_MAP_UNPACK
 - Start 3.6 CALL_FUNCTION_EX support
 - Many decompilation bug fixes. (Many more remain). See ChangeLog
 
-uncompyle6 2.9.10 2016-02-25
+uncompyle6 2.9.10 2017-02-25
 
 - Python grammar rule fixes
 - Add ability to get grammar coverage on runs
@@ -114,7 +121,7 @@ uncompyle6 2.9.6 2016-11-20
 uncompyle6 2.9.5 2016-11-13
 
 - Fix Python 3 bugs:
-  * improprer while 1 else
+  * improper while 1 else
   * docstring indent
   * 3.3 default values in lambda expressions
   * start 3.0 decompilation (needs newer xdis)
@@ -124,12 +131,12 @@ uncompyle6 2.9.5 2016-11-13
 uncompyle6 2.9.4 2016-11-02
 
 - Handle Python 3.x function annotations
-- track def keywoard-parameter line-splitting in source code better
+- track def keyword-parameter line-splitting in source code better
 - bump min xdis version to mask previous xdis bug
 
 uncompyle6 2.9.3 2016-10-26
 
-Release forced by incompatiblity change in xdis 3.2.0.
+Release forced by incompatibility change in xdis 3.2.0.
 
 - Python 3.1 bugs:
   * handle "with ... as"
@@ -161,7 +168,7 @@ uncompyle6 2.9.0 2016-10-09
   this Forces change in requirements.txt and _pkg_info_.py
 - Start Python 1.5 decompiling; another round of work is needed to
   remove bugs
-- Simpify python 2.1 grammar
+- Simplify python 2.1 grammar
 - Fix bug with -t ...  Wasn't showing source text when -t option was given
 - Fix 2.1-2.6 bug in list comprehension
 
@@ -184,7 +191,7 @@ control-flow structure detection is done.
     . 3.0 .. 3.2 *args processing
     . 3.0 .. 3.2 call name and kwargs bug
     . 3.0 .. getting parameter of *
-    . 3.0 .. handling varible number of args
+    . 3.0 .. handling variable number of args
     . 3.0 .. "if" structure bugs
   * 3.5+ if/else bugs
   * 2.2-2.6 bugs
@@ -235,7 +242,7 @@ uncompyle6 2.7.1 2016-07-26
 
 uncompyle6 2.7.0 2016-07-15
 
-- Many Syntax and verifification bugs removed
+- Many Syntax and verification bugs removed
   tested on standard libraries from 2.3.7 to 3.5.1
   and they all decompile and verify fine.
   I'm sure there are more bugs though.
@@ -262,9 +269,9 @@ uncompyle6 2.6.0 2016-07-07
 - Better <2.6 vs. 2.7 grammar separation
 - Fix some 2.7 deparsing bugs
 - Fix bug in installing uncompyle6 script
-- Doc improvments
+- Doc improvements
 
-uncompyle6 2.5.0 2016-06-22  Summer Solstace
+uncompyle6 2.5.0 2016-06-22  Summer Solstice
 
 - Much better Python 3.2-3.5 coverage.
   3.4.6 is probably the best;3.2 and 3.5 are weaker
@@ -276,7 +283,7 @@ uncompyle6 2.5.0 2016-06-22  Summer Solstace
 uncompyle6 2.4.0 2016-05-18 (in memory of Lewis Bernstein)
 
 - Many Python 3 bugs fixed:
-  * Python 3.2 to 3.5 libaries largely
+  * Python 3.2 to 3.5 libraries largely
     uncompyle and most verify
 - pydisassembler:
   * disassembles all code objects in a file
@@ -334,7 +341,7 @@ uncompyle6 2.2.0 2016-04-30
 
 uncompyle6 2.2.0 2016-04-02
 
-- Support single-mode (in addtion to exec-mode) compilation
+- Support single-mode (in addition to exec-mode) compilation
 - Start to DRY Python 2 and Python 3 grammars
 - Fix bug in if else ternary  construct
 - Fix bug in uncomplye6 -d and -r options (via lelicopter)

__pkginfo__.py

@@ -40,7 +40,7 @@ entry_points       = {
     ]}
 ftp_url            = None
 install_requires   = ['spark-parser >= 1.6.1, < 1.7.0',
-                      'xdis >= 3.4.0, < 3.5.0', 'six']
+                      'xdis >= 3.5.0, < 3.6.0', 'six']
 license            = 'MIT'
 mailing_list       = 'python-debugger@googlegroups.com'
 modname            = 'uncompyle6'

test/simple_source/bug26/03_loop_if_cf.py

@@ -0,0 +1,19 @@
+# Bug in < 2.6 is having a COME_FROM_LOOP (but we
+# don't tag that so it is just COME_FROM *before*
+# a jump back to the loop.
+def pickup(self, open_players, open_buf, wrap_buf):
+   for aplayer in self._game.active_players:
+
+      if aplayer in open_players:
+         aplayer.send(open_players)
+
+         if self == aplayer:
+            for awatcher in self._watchers:
+               if awatcher._can_see_detail:
+                  awatcher.send(open_buf)
+               else:
+                  awatcher.send(wrap_buf)
+         else:
+            self._game.send(aplayer.side)
+      else:
+         self._game.send(aplayer.side, wrap_buf)

test/test_pyenvlib.py

@@ -29,7 +29,7 @@ from fnmatch import fnmatch
 
 TEST_VERSIONS=('2.3.7', '2.4.6', '2.5.6', '2.6.9',
                'pypy-2.4.0', 'pypy-2.6.1',
-               'pypy-5.0.1', 'pypy-5.3.1',
+               'pypy-5.0.1', 'pypy-5.3.1', 'pypy3.5-5.7.1-beta',
                '2.7.10', '2.7.11', '2.7.12', '2.7.13',
                '3.0.1', '3.1.5', '3.2.6',
                '3.3.5', '3.3.6',

uncompyle6/parsers/parse26.py

@@ -84,6 +84,12 @@ class Python26Parser(Python2Parser):
         ja_cf_pop ::= JUMP_ABSOLUTE come_froms POP_TOP
         jf_cf_pop ::= JUMP_FORWARD come_froms POP_TOP
 
+        # The first optional COME_FROM when it appears is really
+        # COME_FROM_LOOP, but in <= 2.6 we don't distinguish
+        # this
+
+        cf_jb_cf_pop ::= _come_from JUMP_BACK come_froms POP_TOP
+
         bp_come_from    ::= POP_BLOCK COME_FROM
         jb_bp_come_from ::= JUMP_BACK bp_come_from
 
@@ -111,7 +117,8 @@ class Python26Parser(Python2Parser):
         break_stmt ::= BREAK_LOOP JUMP_BACK
 
         # Semantic actions want else_suitel to be at index 3
-        ifelsestmtl ::= testexpr c_stmts_opt jb_cf_pop else_suitel
+        ifelsestmtl ::= testexpr c_stmts_opt cf_jb_cf_pop else_suitel
+
         ifelsestmtc ::= testexpr c_stmts_opt ja_cf_pop else_suitec
 
         # Semantic actions want suite_stmts_opt to be at index 3

uncompyle6/scanner.py

@@ -89,7 +89,7 @@ class Scanner(object):
         if op is None:
             op = self.code[pos]
         target = self.get_argument(pos)
-        if op in self.opc.hasjrel:
+        if op in self.opc.JREL_OPS:
             target += pos + 3
         return target
 
@@ -100,7 +100,7 @@ class Scanner(object):
     def print_bytecode(self):
         for i in self.op_range(0, len(self.code)):
             op = self.code[i]
-            if op in self.opc.hasjabs+self.opc.hasjrel:
+            if op in self.JUMP_OPs:
                 dest = self.get_target(i, op)
                 print('%i\t%s\t%i' % (i, self.opname[op], dest))
             else:

uncompyle6/scanners/pypy32.py

@@ -1,22 +1,18 @@
-#  Copyright (c) 2016 by Rocky Bernstein
+#  Copyright (c) 2017 by Rocky Bernstein
 """
-Python PyPy 3.2 bytecode scanner/deparser
+Python PyPy 3.2 decompiler scanner.
 
-This overlaps Python's 3.2's dis module, but it can be run from
-Python 3 and other versions of Python. Also, we save token
-information for later use in deparsing.
+Does some additional massaging of xdis-disassembled instructions to
+make things easier for decompilation.
 """
 
 import uncompyle6.scanners.scanner32 as scan
 
 # bytecode verification, verify(), uses JUMP_OPs from here
-from xdis.opcodes import opcode_32 as opc  # is this rgith?
+from xdis.opcodes import opcode_32 as opc  # is this right?
 JUMP_OPs = map(lambda op: opc.opname[op], opc.hasjrel + opc.hasjabs)
 
-# We base this off of 2.6 instead of the other way around
-# because we cleaned things up this way.
-# The history is that 2.7 support is the cleanest,
-# then from that we got 2.6 and so on.
+# We base this off of 3.2
 class ScannerPyPy32(scan.Scanner32):
     def __init__(self, show_asm):
         # There are no differences in initialization between

uncompyle6/scanners/pypy35.py

@@ -0,0 +1,22 @@
+#  Copyright (c) 2017 by Rocky Bernstein
+"""
+Python PyPy 3.2 decompiler scanner.
+
+Does some additional massaging of xdis-disassembled instructions to
+make things easier for decompilation.
+"""
+
+import uncompyle6.scanners.scanner35 as scan
+
+# bytecode verification, verify(), uses JUMP_OPs from here
+from xdis.opcodes import opcode_35 as opc  # is this right?
+JUMP_OPs = map(lambda op: opc.opname[op], opc.hasjrel + opc.hasjabs)
+
+# We base this off of 3.5
+class ScannerPyPy35(scan.Scanner35):
+    def __init__(self, show_asm):
+        # There are no differences in initialization between
+        # pypy 3.5 and 3.5
+        scan.Scanner35.__init__(self, show_asm, is_pypy=True)
+        self.version = 3.5
+        return

uncompyle6/scanners/scanner15.py

@@ -1,6 +1,6 @@
-#  Copyright (c) 2016 by Rocky Bernstein
+#  Copyright (c) 2016-2017 by Rocky Bernstein
 """
-Python 1.5 bytecode scanner/deparser
+Python 1.5 bytecode decompiler scanner.
 
 This massages tokenized 1.5 bytecode to make it more amenable for
 grammar parsing.

uncompyle6/scanners/scanner2.py

@@ -189,7 +189,7 @@ class Scanner2(Scanner):
                 if op == self.opc.EXTENDED_ARG:
                     extended_arg = oparg * L65536
                     continue
-                if op in self.opc.hasconst:
+                if op in self.opc.CONST_OPS:
                     const = co.co_consts[oparg]
                     if iscode(const):
                         oparg = const
@@ -210,23 +210,23 @@ class Scanner2(Scanner):
                         pattr = '<code_object ' + const.co_name + '>'
                     else:
                         pattr = const
-                elif op in self.opc.hasname:
+                elif op in self.opc.NAME_OPS:
                     pattr = names[oparg]
-                elif op in self.opc.hasjrel:
+                elif op in self.opc.JREL_OPS:
                     #  use instead: hasattr(self, 'patch_continue'): ?
                     if self.version == 2.7:
                         self.patch_continue(tokens, offset, op)
                     pattr = repr(offset + 3 + oparg)
-                elif op in self.opc.hasjabs:
+                elif op in self.opc.JABS_OPS:
                     # use instead: hasattr(self, 'patch_continue'): ?
                     if self.version == 2.7:
                         self.patch_continue(tokens, offset, op)
                     pattr = repr(oparg)
-                elif op in self.opc.haslocal:
+                elif op in self.opc.LOCAL_OPS:
                     pattr = varnames[oparg]
-                elif op in self.opc.hascompare:
+                elif op in self.opc.COMPARE_OPS:
                     pattr = self.opc.cmp_op[oparg]
-                elif op in self.opc.hasfree:
+                elif op in self.opc.FREE_OPS:
                     pattr = free[oparg]
 
             if op in self.varargs_ops:
@@ -603,7 +603,7 @@ class Scanner2(Scanner):
 
                     if test == offset:
                         loop_type = 'while 1'
-                    elif self.code[test] in self.opc.hasjabs + self.opc.hasjrel:
+                    elif self.code[test] in self.opc.JUMP_OPs:
                         self.ignore_if.add(test)
                         test_target = self.get_target(test)
                         if test_target > (jump_back+3):
@@ -905,7 +905,9 @@ class Scanner2(Scanner):
                                          'start': start-3,
                                          'end':   pre_rtarget})
 
-                self.not_continue.add(pre_rtarget)
+                # FIXME: this is yet another case were we need dominators.
+                if pre_rtarget not in self.linestartoffsets or self.version < 2.7:
+                    self.not_continue.add(pre_rtarget)
 
                 if rtarget < end:
                     # We have an "else" block  of some kind.
@@ -992,11 +994,11 @@ class Scanner2(Scanner):
                 oparg = self.get_argument(offset)
 
                 if label is None:
-                    if op in self.opc.hasjrel and self.op_name(op) != 'FOR_ITER':
-                        # if (op in self.opc.hasjrel and
+                    if op in self.opc.JREL_OPS and self.op_name(op) != 'FOR_ITER':
+                        # if (op in self.opc.JREL_OPS and
                         #     (self.version < 2.0 or op != self.opc.FOR_ITER)):
                         label = offset + 3 + oparg
-                    elif self.version == 2.7 and op in self.opc.hasjabs:
+                    elif self.version == 2.7 and op in self.opc.JABS_OPS:
                         if op in (self.opc.JUMP_IF_FALSE_OR_POP,
                                   self.opc.JUMP_IF_TRUE_OR_POP):
                             if (oparg > offset):

uncompyle6/scanners/scanner26.py

@@ -181,7 +181,7 @@ class Scanner26(scan.Scanner2):
                 if op == self.opc.EXTENDED_ARG:
                     extended_arg = oparg * L65536
                     continue
-                if op in self.opc.hasconst:
+                if op in self.opc.CONST_OPS:
                     const = co.co_consts[oparg]
                     # We can't use inspect.iscode() because we may be
                     # using a different version of Python than the
@@ -206,9 +206,9 @@ class Scanner26(scan.Scanner2):
                         pattr = '<code_object ' + const.co_name + '>'
                     else:
                         pattr = const
-                elif op in self.opc.hasname:
+                elif op in self.opc.NAME_OPS:
                     pattr = names[oparg]
-                elif op in self.opc.hasjrel:
+                elif op in self.opc.JREL_OPS:
                     pattr = repr(offset + 3 + oparg)
                     if op == self.opc.JUMP_FORWARD:
                         target = self.get_target(offset)
@@ -218,13 +218,13 @@ class Scanner26(scan.Scanner2):
                         if len(tokens) and tokens[-1].type == 'JUMP_BACK':
                             tokens[-1].type = intern('CONTINUE')
 
-                elif op in self.opc.hasjabs:
+                elif op in self.opc.JABS_OPS:
                     pattr = repr(oparg)
-                elif op in self.opc.haslocal:
+                elif op in self.opc.LOCAL_OPS:
                     pattr = varnames[oparg]
-                elif op in self.opc.hascompare:
+                elif op in self.opc.COMPARE_OPS:
                     pattr = self.opc.cmp_op[oparg]
-                elif op in self.opc.hasfree:
+                elif op in self.opc.FREE_OPS:
                     pattr = free[oparg]
             if op in self.varargs_ops:
                 # CE - Hack for >= 2.5

uncompyle6/scanners/scanner3.py

@@ -633,11 +633,11 @@ class Scanner3(Scanner):
         rel_offset = 0
         if self.version  >= 3.6:
             target = self.code[offset+1]
-            if op in self.opc.hasjrel:
+            if op in self.opc.JREL_OPS:
                 rel_offset = offset + 2
         else:
             target = self.code[offset+1] + self.code[offset+2] * 256
-            if op in self.opc.hasjrel:
+            if op in self.opc.JREL_OPS:
                 rel_offset = offset + 3
                 pass
             pass

uncompyle6/scanners/scanner30.py

@@ -120,7 +120,7 @@ class Scanner30(Scanner3):
 
                     if test == offset:
                         loop_type = 'while 1'
-                    elif self.code[test] in opc.hasjabs+opc.hasjrel:
+                    elif self.code[test] in opc.JUMP_OPs:
                         self.ignore_if.add(test)
                         test_target = self.get_target(test)
                         if test_target > (jump_back+3):

uncompyle6/scanners/scanner32.py

@@ -1,6 +1,9 @@
-#  Copyright (c) 2015-2016 by Rocky Bernstein
+#  Copyright (c) 2015-2017 by Rocky Bernstein
 """
-Python 3.2 bytecode scanner/deparser
+Python 3.2 bytecode decompiler scanner.
+
+Does some additional massaging of xdis-disassembled instructions to
+make things easier for decompilation.
 
 This sets up opcodes Python's 3.2 and calls a generalized
 scanner routine for Python 3.

uncompyle6/scanners/scanner34.py

@@ -1,6 +1,9 @@
-#  Copyright (c) 2015-2016 by Rocky Bernstein
+#  Copyright (c) 2015-2017 by Rocky Bernstein
 """
-Python 3.4 bytecode scanner/deparser
+Python 3.4 bytecode decompiler scanner
+
+Does some additional massaging of xdis-disassembled instructions to
+make things easier for decompilation.
 
 This sets up opcodes Python's 3.4 and calls a generalized
 scanner routine for Python 3.

uncompyle6/scanners/scanner35.py

@@ -1,6 +1,9 @@
-#  Copyright (c) 2016 by Rocky Bernstein
+#  Copyright (c) 2017 by Rocky Bernstein
 """
-Python 3.5 bytecode scanner/deparser
+Python 3.5 bytecode decompiler scanner
+
+Does some additional massaging of xdis-disassembled instructions to
+make things easier for decompilation.
 
 This sets up opcodes Python's 3.5 and calls a generalized
 scanner routine for Python 3.
@@ -16,8 +19,8 @@ JUMP_OPs = map(lambda op: opc.opname[op], opc.hasjrel + opc.hasjabs)
 
 class Scanner35(Scanner3):
 
-    def __init__(self, show_asm=None):
-        Scanner3.__init__(self, 3.5, show_asm)
+    def __init__(self, show_asm=None, is_pypy=False):
+        Scanner3.__init__(self, 3.5, show_asm, is_pypy)
         return
     pass
 

uncompyle6/scanners/scanner36.py

@@ -1,6 +1,9 @@
 #  Copyright (c) 2016-2017 by Rocky Bernstein
 """
-Python 3.6 bytecode scanner/deparser
+Python 3.6 bytecode decompiler scanner
+
+Does some additional massaging of xdis-disassembled instructions to
+make things easier for decompilation.
 
 This sets up opcodes Python's 3.6 and calls a generalized
 scanner routine for Python 3.

uncompyle6/scanners/tok.py

@@ -65,10 +65,10 @@ class Token:
         if self.pattr:
             pattr = self.pattr
             if self.opc:
-                if self.op in self.opc.hasjrel:
+                if self.op in self.opc.JREL_OPS:
                     if not self.pattr.startswith('to '):
                         pattr = "to " + self.pattr
-                elif self.op in self.opc.hasjabs:
+                elif self.op in self.opc.JABS_OPS:
                     self.pattr= str(self.pattr)
                     if not self.pattr.startswith('to '):
                         pattr = "to " + str(self.pattr)

uncompyle6/semantics/make_function.py

@@ -411,7 +411,8 @@ def make_function2(self, node, isLambda, nested=1, codeNode=None):
     if code_has_star_star_arg(code):
         if argc > 0:
             self.write(', ')
-        self.write('**%s' % code.co_varnames[argc + kw_pairs])
+        if argc + kw_pairs > 0:
+            self.write('**%s' % code.co_varnames[argc + kw_pairs])
 
     if isLambda:
         self.write(": ")

uncompyle6/version.py

@@ -1,3 +1,3 @@
 # This file is suitable for sourcing inside bash as
 # well as importing into Python
-VERSION='2.11.1'
+VERSION='2.11.2'