.

wcfs/internal/wcfs_test.pyx

@@ -95,6 +95,8 @@ cdef cbool faultedOk     = False
 cdef unsigned char mustfaultG   # global var for compiler not to optimize-out p[0] access
 
 cdef void  mustfaultSighand(int sig) nogil:
+    global faultedOk
+
     if not faultExpected:
         panic("unexpected fault")