enable true division for language_level=3

CHANGES.rst

@@ -20,6 +20,9 @@ Features added
 Bugs fixed
 ----------
 
+* Language level 3 did not enable true division (a.k.a. float division) for
+  integer operands.
+
 * Runtime reported file paths of source files (e.g for profiling and tracing)
   are now relative to the build root directory instead of the main source file.
 

Cython/Compiler/Main.py

@@ -89,8 +89,8 @@ class Context(object):
     def set_language_level(self, level):
         self.language_level = level
         if level >= 3:
-            from .Future import print_function, unicode_literals, absolute_import
-            self.future_directives.update([print_function, unicode_literals, absolute_import])
+            from .Future import print_function, unicode_literals, absolute_import, division
+            self.future_directives.update([print_function, unicode_literals, absolute_import, division])
             self.modules['builtins'] = self.modules['__builtin__']
 
     # pipeline creation functions can now be found in Pipeline.py

tests/run/cython3.pyx

@@ -27,6 +27,39 @@ def locals_function(a, b=2):
     return locals()
 
 
+### true division
+
+def truediv(x):
+    """
+    >>> truediv(4)
+    2.0
+    >>> truediv(3)
+    1.5
+    """
+    return x / 2
+
+
+def truediv_int(int x):
+    """
+    >>> truediv_int(4)
+    2.0
+    >>> truediv_int(3)
+    1.5
+    """
+    return x / 2
+
+
+@cython.cdivision(True)
+def cdiv_int(int x):
+    """
+    >>> cdiv_int(4)
+    2
+    >>> cdiv_int(3)
+    1
+    """
+    return x / 2
+
+
 ### module level except-as tests
 
 exc = [None]