Hi! Trying to fix some tests broken by CF I've found this issue: def fuu(object[int] b1): cdef object[int] b2 print b1 buff.c: In function ‘__pyx_pf_4buff_fuu’: buff.c:504: error: ‘__pyx_bstruct_b2’ undeclared (first use in this function) buff.c:504: error: (Each undeclared identifier is reported only once buff.c:504: error: for each function it appears in.) buff.c: In function ‘__Pyx_BufFmt_TypeCharToAlignment’: buff.c:809: warning: unused parameter ‘is_complex’ -- vitja.