Refine 2.7 dead code test ..

in a hacky way. Will probalby have to expand this in the future or
better do dead code analysis

test/simple_source/bug27+/03_not_dead_code.py

@@ -0,0 +1,9 @@
+# Bug found in 2.7 test_itertools.py
+# Bug was erroneously using reduction to unconditional_true
+# A proper fix would be to use unconditional_true only when we
+# can determine there is or was dead code.
+from itertools import izip_longest
+for args in [['abc', range(6)]]:
+    target = [tuple([arg[i] if i < len(arg) else None for arg in args])
+              for i in range(max(map(len, args)))]
+    assert list(izip_longest(*args)) ==  target

test/stdlib/runtests.sh

@@ -77,7 +77,6 @@ case $PYVERSION in
 	    [test_grammar.py]=1  # Too many stmts. Handle large stmts
 	    [test_io.py]=1 # Test takes too long to run
 	    [test_ioctl.py]=1 # Test takes too long to run
-	    [test_itertools.py]=1 # Syntax error - look at!
 	    [test_memoryio.py]=1 # FIX
 	    [test_multiprocessing.py]=1 # On uncompyle2, taks 24 secs
 	    [test_pep352.py]=1 # ?

uncompyle6/parsers/parse27.py

@@ -102,7 +102,9 @@ class Python27Parser(Python2Parser):
 
         # conditional_true are for conditions which always evaluate true
         # There is dead or non-optional remnants of the condition code though,
-        # and we use that to match on to reconstruct the source more accurately
+        # and we use that to match on to reconstruct the source more accurately.
+        # FIXME: we should do analysis and reduce *only* if there is dead code
+
         expr             ::= conditional_true
         conditional_true ::= expr JUMP_FORWARD expr COME_FROM
 
@@ -167,6 +169,7 @@ class Python27Parser(Python2Parser):
         """)
         super(Python27Parser, self).customize_grammar_rules(tokens, customize)
         self.check_reduce['and'] = 'AST'
+        self.check_reduce['conditional_true'] = 'AST'
         return
 
     def reduce_is_invalid(self, rule, ast, tokens, first, last):
@@ -182,6 +185,15 @@ class Python27Parser(Python2Parser):
             jmp_target = jmp_false.offset + jmp_false.attr + 3
             return not (jmp_target == tokens[last].offset or
                         tokens[last].pattr == jmp_false.pattr)
+        elif rule[0] == ('conditional_true'):
+            # FIXME: the below is a hack. script is probably never used in a boolean
+            # What we really need is to look for precence of dead code.
+            if ast[0] == 'expr':
+                a = ast[0]
+            else:
+                a = ast
+            return a[0] == 'subscript'
+
         return False