Fix bug #252, mangle illegal optional c argument names.

Cython/Compiler/ExprNodes.py

@@ -2572,7 +2572,7 @@ class SimpleCallNode(CallNode):
                 for formal_arg, actual_arg in args[expected_nargs:actual_nargs]:
                     code.putln("%s.%s = %s;" % (
                             self.opt_arg_struct,
-                            formal_arg.name,
+                            func_type.opt_arg_cname(formal_arg.name),
                             actual_arg.result_as(formal_arg.type)))
             exc_checks = []
             if self.type.is_pyobject:

Cython/Compiler/Nodes.py

@@ -1473,13 +1473,11 @@ class CFuncDefNode(FuncDefNode):
             code.putln('if (%s) {' % Naming.optional_args_cname)
             for arg in self.args:
                 if arg.default:
-                    # FIXME: simple name prefixing doesn't work when
-                    # argument name mangling is in place
                     code.putln('if (%s->%sn > %s) {' % (Naming.optional_args_cname, Naming.pyrex_prefix, i))
                     declarator = arg.declarator
                     while not hasattr(declarator, 'name'):
                         declarator = declarator.base
-                    code.putln('%s = %s->%s;' % (arg.cname, Naming.optional_args_cname, declarator.name))
+                    code.putln('%s = %s->%s;' % (arg.cname, Naming.optional_args_cname, self.type.opt_arg_cname(declarator.name)))
                     i += 1
             for _ in range(self.type.optional_arg_count):
                 code.putln('}')

Cython/Compiler/PyrexTypes.py

@@ -1535,6 +1535,9 @@ class CFuncType(CType):
     def signature_cast_string(self):
         s = self.declaration_code("(*)", with_calling_convention=False)
         return '(%s)' % s
+    
+    def opt_arg_cname(self, arg_name):
+        return self.op_arg_struct.base_type.scope.lookup(arg_name).cname
 
 
 class CFuncTypeArg(object):

tests/bugs.txt

@@ -5,5 +5,4 @@ methodmangling_T5
 class_attribute_init_values_T18
 numpy_ValueError_T172
 unsignedbehaviour_T184
-bad_c_struct_T252
 missing_baseclass_in_predecl_T262

tests/run/bad_c_struct_T252.pyx

 cdef cf(default=None):
     return default
 
-cpdef cpf(default=None):
+cpdef cpf(default=100):
     """
     >>> cpf()
-    None
+    100
     >>> cpf(1)
     1
     >>> cpf(default=2)
@@ -13,10 +13,10 @@ cpdef cpf(default=None):
     default = cf(default)
     return default
 
-def pf(default=None):
+def pf(default=100):
     """
     >>> pf()
-    None
+    100
     >>> pf(1)
     1
     >>> pf(default=2)