def do_undef(self, t):
        """
        Default handling of a #undef line.
        """
        try: del self.cpp_namespace[t[1]]
        except __HOLE__: pass
dataset/ETHPy150Open kayhayen/Nuitka/nuitka/build/inline_copy/lib/scons-2.3.2/SCons/cpp.py/PreProcessor.do_undef