diff --git a/test/Makefile b/test/Makefile
index 15fc94f9..06637d2c 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -116,6 +116,11 @@ grammar-coverage-2.7:
 	SPARK_PARSER_COVERAGE=/tmp/spark-grammar-27.cover $(PYTHON) test_pythonlib.py --bytecode-2.7
 	SPARK_PARSER_COVERAGE=/tmp/spark-grammar-27.cover $(PYTHON) test_pyenvlib.py --2.7.13
 
+#: Get grammar coverage for Python 3.4
+grammar-coverage-3.4:
+	SPARK_PARSER_COVERAGE=/tmp/spark-grammar-34.cover $(PYTHON) test_pythonlib.py --bytecode-3.4
+	SPARK_PARSER_COVERAGE=/tmp/spark-grammar-34.cover $(PYTHON) test_pyenvlib.py --3.4.2
+
 #: Check deparsing Python 2.6
 check-bytecode-2.6:
 	$(PYTHON) test_pythonlib.py --bytecode-2.6 --weak-verify
diff --git a/test/bytecode_2.6/10_del.pyc b/test/bytecode_2.6/10_del.pyc
index 68414033..1be07946 100644
Binary files a/test/bytecode_2.6/10_del.pyc and b/test/bytecode_2.6/10_del.pyc differ
diff --git a/test/bytecode_3.4/10_del.pyc b/test/bytecode_3.4/10_del.pyc
index 8da488ef..1aa477c0 100644
Binary files a/test/bytecode_3.4/10_del.pyc and b/test/bytecode_3.4/10_del.pyc differ
diff --git a/test/bytecode_3.5/10_del.pyc b/test/bytecode_3.5/10_del.pyc
index 714d7d16..4bf9719f 100644
Binary files a/test/bytecode_3.5/10_del.pyc and b/test/bytecode_3.5/10_del.pyc differ
diff --git a/test/simple_source/stmts/10_del.py b/test/simple_source/stmts/10_del.py
index e1af6772..65d1aa3a 100644
--- a/test/simple_source/stmts/10_del.py
+++ b/test/simple_source/stmts/10_del.py
@@ -11,3 +11,8 @@ del c[2:3]
 
 d = [0,1,2,3,4,5,6]
 del d[1:3:2]
+
+e = ('a', 'b')
+def foo():
+    global e
+    del e
diff --git a/test/test_pyenvlib.py b/test/test_pyenvlib.py
index 6ace979a..35061f07 100755
--- a/test/test_pyenvlib.py
+++ b/test/test_pyenvlib.py
@@ -30,10 +30,11 @@ 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', 'pypy3.5-5.7.1-beta',
-               '2.7.10', '2.7.11', '2.7.12', '2.7.13',
+               '2.7.10', '2.7.11', '2.7.12', '2.7.13', '2.7.14',
                '3.0.1', '3.1.5', '3.2.6',
                '3.3.5', '3.3.6',
-               '3.4.2', '3.5.1', '3.6.0', 'native')
+               '3.4.2', '3.5.1', '3.5.2', '3.6.0', '3.6.3',
+               'native')
 
 target_base = '/tmp/py-dis/'
 lib_prefix = os.path.join(os.environ['HOME'], '.pyenv/versions')
diff --git a/uncompyle6/parsers/parse26.py b/uncompyle6/parsers/parse26.py
index 85449528..3015f197 100644
--- a/uncompyle6/parsers/parse26.py
+++ b/uncompyle6/parsers/parse26.py
@@ -263,6 +263,11 @@ class Python26Parser(Python2Parser):
         if invalid:
             return invalid
         if rule == ('and', ('expr', 'jmp_false', 'expr', '\\e_come_from_opt')):
+
+            # FIXME: workaround profiling bug
+            if ast[1] is None:
+                return False
+
             # Test that jmp_false jumps to the end of "and"
             # or that it jumps to the same place as the end of "and"
             jmp_false = ast[1][0]
diff --git a/uncompyle6/semantics/check_ast.py b/uncompyle6/semantics/check_ast.py
index f2b42bde..417232d1 100644
--- a/uncompyle6/semantics/check_ast.py
+++ b/uncompyle6/semantics/check_ast.py
@@ -9,6 +9,8 @@ before reduction and don't reduce when there is a problem.
 """
 
 def checker(ast, in_loop, errors):
+    if ast is None:
+        return
     in_loop = in_loop or ast.kind in ('while1stmt', 'whileTruestmt',
                                       'whilestmt', 'whileelsestmt', 'while1elsestmt',
                                       'for_block')
diff --git a/uncompyle6/semantics/pysource.py b/uncompyle6/semantics/pysource.py
index 4f4559a6..d29f671c 100644
--- a/uncompyle6/semantics/pysource.py
+++ b/uncompyle6/semantics/pysource.py
@@ -2239,6 +2239,10 @@ def deparse_code(version, co, out=sys.stdout, showasm=None, showast=False,
     isTopLevel = co.co_name == '<module>'
     deparsed.ast = deparsed.build_ast(tokens, customize, isTopLevel=isTopLevel)
 
+    #### XXX workaround for profiling
+    if deparsed.ast is None:
+        return None
+
     assert deparsed.ast == 'stmts', 'Should have parsed grammar start'
 
     del tokens # save memory