Add __future__ import for print_function.  It's a no-op in 3.0, but it needs to not be a syntax error.
Closes issue 2436.
diff --git a/Lib/__future__.py b/Lib/__future__.py
index d8e14d1..ea14bf3 100644
--- a/Lib/__future__.py
+++ b/Lib/__future__.py
@@ -53,6 +53,7 @@
     "division",
     "absolute_import",
     "with_statement",
+    "print_function",
 ]
 
 __all__ = ["all_feature_names"] + all_feature_names
@@ -66,6 +67,7 @@
 CO_FUTURE_DIVISION   = 0x2000   # division
 CO_FUTURE_ABSOLUTE_IMPORT = 0x4000 # perform absolute imports by default
 CO_FUTURE_WITH_STATEMENT  = 0x8000   # with statement
+CO_FUTURE_PRINT_FUNCTION  = 0x10000   # print function
 
 class _Feature:
     def __init__(self, optionalRelease, mandatoryRelease, compiler_flag):
@@ -114,3 +116,7 @@
 with_statement = _Feature((2, 5, 0, "alpha", 1),
                           (2, 6, 0, "alpha", 0),
                           CO_FUTURE_WITH_STATEMENT)
+
+print_function = _Feature((2, 6, 0, "alpha", 2),
+                          (3, 0, 0, "alpha", 0),
+                          CO_FUTURE_PRINT_FUNCTION)