Hello, I have Cython code like this: cdef extern from "cpp_library.h" namespace "CppLibrary": struct SomeStruct: int i void do_with_struct(SomeStruct s) def run(): do_with_struct(object()) With cython 0.21.1, invalid C++ code is generated: struct CppLibrary::SomeStruct; static struct CppLibrary::SomeStruct __pyx_convert__from_py_CppLibrary::SomeStruct(PyObject *); With cython master, a compiler error occurs: @cname("__pyx_convert__from_py_CppLibrary::SomeStruct") cdef SomeStruct __pyx_convert__from_py_CppLibrary::SomeStruct(obj) except *: ^ FromPyStructUtility:11:50: Expected an identifier or literal Cython should mangle the struct name to ensure the helper function has a valid name. Regards, -- Daniel Grunwald Axivion GmbH Nobelstr. 15 70569 Stuttgart Deutschland Tel: +49 711 6204378-33 Fax: +49 711 6204378-99 Geschaeftsfuehrung: Stefan Bellon, Thomas Eisenbarth, Sebastian Rummler Sitz der Gesellschaft: Stuttgart Registergericht: Amtsgericht Stuttgart, HRB 720590