Add some more CF tests

tests/errors/w_uninitialized.pyx

@@ -54,10 +54,20 @@ def dict_comp(a):
 def generic_args_call(*args, **kwargs):
     return args, kwargs
 
+def cascaded(x):
+    print a, b
+    a = b = x
+
+def from_import():
+    print bar
+    from foo import bar
 
 _ERRORS = """
 6:11: local variable 'a' referenced before assignment
 12:12: local variable 'a' might be referenced before assignment
 29:12: local variable 'a' might be referenced before assignment
 35:15: local variable 'b' might be referenced before assignment
+58:11: local variable 'a' referenced before assignment
+58:14: local variable 'b' referenced before assignment
+62:13: local variable 'bar' referenced before assignment
 """

tests/errors/w_uninitialized_exc.pyx

@@ -68,10 +68,36 @@ def exc_assmt_finaly(a):
     except:
         return x
 
+def raise_stat(a):
+    try:
+        if a < 0:
+            raise IndexError
+    except IndexError:
+        oops = 1
+    print oops
+
+def try_loop(args):
+    try:
+        x = 0
+        for i in args:
+            if i is 0:
+                continue
+            elif i is None:
+                break
+            elif i is False:
+                return
+            i()
+    except ValueError:
+        x = 1
+    finally:
+        return x
+
 _ERRORS = """
 12:12: local variable 'e' might be referenced before assignment
 12:15: local variable 'i' might be referenced before assignment
 19:12: local variable 'a' might be referenced before assignment
 63:16: local variable 'x' might be referenced before assignment
 69:16: local variable 'x' might be referenced before assignment
+77:14: local variable 'oops' might be referenced before assignment
+93:16: local variable 'x' might be referenced before assignment
 """

tests/errors/w_uninitialized_for.pyx

@@ -30,9 +30,33 @@ def simple_target_f(n):
         i *= i
     return i
 
+def simple_for_from(n):
+    for i from 0 <= i <= n:
+        x = i
+    else:
+        return x
+
+def for_continue(l):
+    for i in l:
+        if i > 0:
+            continue
+        x = i
+    print x
+
+def for_break(l):
+    for i in l:
+        if i > 0:
+            break
+        x = i
+    print x
+
+
 _ERRORS = """
 8:12: local variable 'a' might be referenced before assignment
 14:12: local variable 'a' might be referenced before assignment
 26:12: local variable 'i' might be referenced before assignment
 31:12: local variable 'i' might be referenced before assignment
+37:16: local variable 'x' might be referenced before assignment
+44:11: local variable 'x' might be referenced before assignment
+51:11: local variable 'x' might be referenced before assignment
 """