Now has a legitimate warning message.

Cython/Compiler/DebugFlags.py

 # Can be enabled at the command line with --debug-xxx.
 
 debug_disposal_code = 0
-debug_temp_alloc = 1
+debug_temp_alloc = 0
 debug_coercion = 0
 
 # Write comments into the C code that show where temporary variables

Cython/Compiler/ExprNodes.py

@@ -11377,6 +11377,10 @@ class CoerceFromPyTypeNode(CoercionNode):
         if not result_type.create_from_py_utility_code(env):
             error(arg.pos,
                   "Cannot convert Python object to '%s'" % result_type)
+        elif result_type.is_reference:
+            warning(arg.pos,
+                    "Cannot pass Python object as %s reference, will pass by copy." % result_type,
+                    level=1)
         if self.type.is_string or self.type.is_pyunicode_ptr:
             if self.arg.is_name and self.arg.entry and self.arg.entry.is_pyglobal:
                 warning(arg.pos,

Cython/Compiler/PyrexTypes.py

@@ -4,7 +4,6 @@
 
 from __future__ import absolute_import
 
-import re
 import copy
 import re
 
@@ -12,7 +11,7 @@ from .Code import UtilityCode, LazyUtilityCode, TempitaUtilityCode
 from . import StringEncoding
 from . import Naming
 
-from .Errors import error, warning
+from .Errors import error
 
 
 class BaseType(object):
@@ -3287,10 +3286,6 @@ class CppClassType(CType):
                 tags = type_identifier(self),
             else:
                 cls = self.cname[5:]
-
-            if self.is_reference:
-                warning("dwqkokw", -1)
-                print "warned"
             cname = '__pyx_convert_%s_from_py_%s' % (cls, '__and_'.join(tags))
             context = {
                 'template_type_declarations': '\n'.join(declarations),