add test case for copied yield
add test case for copied yield

mcanthony/cython,cython/cython,larsmans/cython,fabianrost84/cython,fperez/cython,acrispin/cython,achernet/cython,fperez/cython,ABcDexter/cython,andreasvc/cython,roxyboy/cython,hhsprings/cython,fperez/cython,rguillebert/CythonCTypesBackend,marscher/cython,madjar/cython,marscher/cython,ChristopherHogan/cython,slonik-az/cython,dahebolangkuan/cython,encukou/cython,acrispin/cython,andreasvc/cython,c-blake/cython,acrispin/cython,hhsprings/cython,hhsprings/cython,c-blake/cython,cython/cython,hickford/cython,mrGeen/cython,marscher/cython,marscher/cython,achernet/cython,ChristopherHogan/cython,mrGeen/cython,hhsprings/cython,rguillebert/CythonCTypesBackend,scoder/cython,rguillebert/CythonCTypesBackend,cython/cython,fabianrost84/cython,dahebolangkuan/cython,achernet/cython,da-woods/cython,ABcDexter/cython,hpfem/cython,hickford/cython,scoder/cython,mcanthony/cython,achernet/cython,c-blake/cython,mcanthony/cython,encukou/cython,slonik-az/cython,scoder/cython,da-woods/cython,rguillebert/CythonCTypesBackend,JelleZijlstra/cython,fabianrost84/cython,c-blake/cython,larsmans/cython,madjar/cython,ABcDexter/cython,madjar/cython,madjar/cython,da-woods/cython,ABcDexter/cython,scoder/cython,hickford/cython,encukou/cython,mcanthony/cython,slonik-az/cython,hpfem/cython,acrispin/cython,fabianrost84/cython,achernet/cython,mcanthony/cython,roxyboy/cython,andreasvc/cython,hpfem/cython,fperez/cython,hpfem/cython,hickford/cython,marscher/cython,larsmans/cython,encukou/cython,mrGeen/cython,ABcDexter/cython,hickford/cython,hhsprings/cython,dahebolangkuan/cython,JelleZijlstra/cython,JelleZijlstra/cython,andreasvc/cython,mrGeen/cython,dahebolangkuan/cython,ChristopherHogan/cython,JelleZijlstra/cython,madjar/cython,mrGeen/cython,JelleZijlstra/cython,da-woods/cython,slonik-az/cython,andreasvc/cython,roxyboy/cython,roxyboy/cython,hpfem/cython,encukou/cython,cython/cython,fperez/cython,roxyboy/cython,larsmans/cython,larsmans/cython,fabianrost84/cython,slonik-az/cython,acrispin/cython,c-blake/cython,dahebolangkuan/cython