def header_source_parse(self, sourcelines):
        name, value = sourcelines[0].split(':', 1)
        value = value.lstrip(' \t') + ''.join(sourcelines[1:])
        return (name, value.rstrip('\r\n'))
.. todo::
dataset/ETHPy150Open OpenCobolIDE/OpenCobolIDE/open_cobol_ide/extlibs/future/backports/email/_policybase.py/Compat32.header_source_parse--crossover with--dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/sandbox/cuda_convnet/response_norm.py/CrossMapNorm.grad