add missing preprocessor guard around coroutine dependant code in generic generator utility function
add missing preprocessor guard around coroutine dependant code in generic generator utility function

scoder/cython,scoder/cython,da-woods/cython,da-woods/cython,da-woods/cython,cython/cython,da-woods/cython,cython/cython,scoder/cython,cython/cython,cython/cython,scoder/cython