Handle if not else in lambdas...

Fixes #170

test/simple_source/branching/02_ifelse_lambda.py

@@ -2,7 +2,8 @@
 # lambda's have to be more or less on a line
 
 f = lambda x: 1 if x<2 else 3
-f(5)
+assert f(3) == 3
+assert f(1) == 1
 
 # If that wasn't enough ...
 # Python will create dead code
@@ -10,10 +11,18 @@ f(5)
 # not to include the else expression
 
 g = lambda: 1 if True else 3
-g()
+assert g() == 1
 
 h = lambda: 1 if False else 3
-h()
+assert h() == 3
 
 # From 2.7 test_builtin
-lambda c: 'a' <= c <= 'z', 'Hello World'
+i = lambda c: 'a' <= c <= 'z', 'Hello World'
+assert i[0]('a') == True
+assert i[0]('A') == False
+
+# Issue #170. Bug is needing an "conditional_not_lambda" grammar rule
+# in addition the the "conditional_lambda" rule
+j = lambda a: False if not a else True
+assert j(True) == True
+assert j(False) == False