t/44-model.t ............. ok

#   Failed test '$! should not be altered by NYTProf i/o'
#   at t/50-errno.t line 58.
#          got: '0'
#     expected: '3'
# Looks like you failed 1 test of 8.
t/50-errno.t ............. 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/8 subtests