["python","python-2.7","python-internals"]
Where is the "from __future__ import braces" code?

I was wondering what is exactly the code that gets executed on the command: >>> from __future__ import braces SyntaxError: not a chance Since Python is open-sourced, I opened C:\Python27\Lib\__future__.py and looked. Surprisingly, I found nothing there that handles importing the braces module. So, my question is, where is the code that handles this? What happens when I run that command?
The code is in future.c: future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename) // ... else if (strcmp(feature, "braces") == 0) { PyErr_SetString(PyExc_SyntaxError, "not a chance"); PyErr_SyntaxLocation(filename, s->lineno); return 0; }