[conversions] Fix literal Nones in converted execs

ddfisher · ddfisher · commit 8ecd3d0a5688 · 2016-07-01T17:18:08.000-07:00
diff --git a/typed_ast/conversions.py b/typed_ast/conversions.py
@@ -132,8 +132,15 @@ def visit_Raise(self, n):
         return ret
 
     def visit_Exec(self, n):
+        new_globals = self.maybe_visit(n.globals)
+        if new_globals is None:
+            new_globals = ast35.Name("None", ast35.Load(), lineno=-1, col_offset=-1)
+        new_locals = self.maybe_visit(n.locals)
+        if new_locals is None:
+            new_locals = ast35.Name("None", ast35.Load(), lineno=-1, col_offset=-1)
+
         return ast35.Expr(ast35.Call(ast35.Name("exec", ast35.Load(), lineno=n.lineno, col_offset=-1),
-                                     [self.visit(n.body), self.maybe_visit(n.globals), self.maybe_visit(n.locals)],
+                                     [self.visit(n.body), new_globals, new_locals],
                                      [],
                                      lineno=n.lineno, col_offset=-1))
 
