Completely remove init_to_none attribute

Cython/Compiler/Code.py

@@ -1290,10 +1290,7 @@ class CCodeWriter(object):
 
     def put_var_decref(self, entry):
         if entry.type.is_pyobject:
-            if entry.init_to_none:
-                self.putln("__Pyx_DECREF(%s);" % self.entry_as_pyobject(entry))
-            else:
-                self.putln("__Pyx_XDECREF(%s);" % self.entry_as_pyobject(entry))
+            self.putln("__Pyx_XDECREF(%s);" % self.entry_as_pyobject(entry))
 
     def put_var_decref_clear(self, entry):
         if entry.type.is_pyobject:

Cython/Compiler/Nodes.py

@@ -1416,10 +1416,6 @@ class FuncDefNode(StatNode, BlockNode):
             if entry.type.is_pyobject:
                 if (acquire_gil or entry.assignments) and not entry.in_closure:
                     code.put_var_incref(entry)
-        # ----- Initialise local variables
-        for entry in lenv.var_entries:
-            if entry.type.is_pyobject and entry.init_to_none and entry.used:
-                code.put_init_var_to_py_none(entry)
         # ----- Initialise local buffer auxiliary variables
         for entry in lenv.var_entries + lenv.arg_entries:
             if entry.type.is_buffer and entry.buffer_aux.buffer_info_var.used:
@@ -2264,7 +2260,6 @@ class DefNode(FuncDefNode):
                 arg.entry = env.declare_var(arg.name, arg.type, arg.pos)
                 if arg.type.is_pyobject:
                     arg.entry.init = "0"
-                arg.entry.init_to_none = 0
             else:
                 arg.entry = self.declare_argument(env, arg)
             arg.entry.used = 1
@@ -2285,7 +2280,6 @@ class DefNode(FuncDefNode):
             entry = env.declare_var(arg.name, type, arg.pos)
             entry.used = 1
             entry.init = "0"
-            entry.init_to_none = 0
             entry.xdecref_cleanup = 1
             arg.entry = entry
             env.control_flow.set_state((), (arg.name, 'initialized'), True)

Cython/Compiler/Optimize.py

@@ -3294,10 +3294,6 @@ class FinalOptimizePhase(Visitor.CythonTransform):
         if node.first:
             lhs = node.lhs
             lhs.lhs_of_first_assignment = True
-            if isinstance(lhs, ExprNodes.NameNode) and lhs.entry.type.is_pyobject:
-                # Have variable initialized to 0 rather than None
-                lhs.entry.init_to_none = False
-                lhs.entry.init = 0
         return node
 
     def visit_SimpleCallNode(self, node):

Cython/Compiler/ParseTreeTransforms.py

@@ -1540,8 +1540,6 @@ if VALUE is not None:
                 type_name = entry.type.module_name + '.' + type_name
             if entry.init is not None:
                 default_value = ' = ' + entry.init
-            elif entry.init_to_none:
-                default_value = ' = ' + repr(None)
             docstring = attr_name + ': ' + type_name + default_value
             property.doc = EncodedString(docstring)
         # ---------------------------------------

Cython/Compiler/Symtab.py

@@ -96,7 +96,6 @@ class Entry(object):
     #                               holding its home namespace
     # pymethdef_cname  string     PyMethodDef structure
     # signature        Signature  Arg & return types for Python func
-    # init_to_none     boolean    True if initial value should be None
     # as_variable      Entry      Alternative interpretation of extension
     #                               type name or builtin C function as a variable
     # xdecref_cleanup  boolean    Use Py_XDECREF for error cleanup
@@ -157,7 +156,6 @@ class Entry(object):
     func_cname = None
     func_modifiers = []
     doc = None
-    init_to_none = 0
     as_variable = None
     xdecref_cleanup = 0
     in_cinclude = 0
@@ -1390,7 +1388,6 @@ class LocalScope(Scope):
                                   api=api, in_pxd=in_pxd, is_cdef=is_cdef)
         if type.is_pyobject and not Options.init_local_none:
             entry.init = "0"
-        entry.init_to_none = False
         entry.is_local = 1
 
         entry.in_with_gil_block = self._in_with_gil_block