Fix issues with unreachable flows.

This benefits static analysis as well as autocompletion: Unreachable code (things like code within 'if 0:') should still be resolveable.

test/completion/flow_analysis.py

@@ -182,3 +182,26 @@ isinst(1.0)
 isinst(False)
 #? int()
 isinst('')
+
+# -----------------
+# flows that are not reachable should be able to access parent scopes.
+# -----------------
+
+foobar = ''
+
+if 0:
+    within_flow = 1.0
+    #? float()
+    within_flow
+    #? str()
+    foobar
+    if 0:
+        nested = 1
+        #? int()
+        nested
+        #? float()
+        within_flow
+        #? str()
+        foobar
+    #?
+    nested

test/test_api/test_call_signatures.py

@@ -207,7 +207,7 @@ def test_signature_is_definition():
     # Now compare all the attributes that a CallSignature must also have.
     for attr_name in dir(definition):
         dont_scan = ['defined_names', 'line_nr', 'start_pos', 'documentation',
-                     'doc', 'parent']
+                     'doc', 'parent', 'goto_assignments']
         if attr_name.startswith('_') or attr_name in dont_scan:
             continue
         attribute = getattr(definition, attr_name)