do not get the finalizer when an extension is a lambda function
do not get the finalizer when an extension is a lambda function

delta2323/chainer,aonotas/chainer,anaruse/chainer,ktnyt/chainer,niboshi/chainer,niboshi/chainer,jnishi/chainer,jnishi/chainer,jnishi/chainer,keisuke-umezawa/chainer,niboshi/chainer,kashif/chainer,keisuke-umezawa/chainer,okuta/chainer,cupy/cupy,cupy/cupy,wkentaro/chainer,kiyukuta/chainer,chainer/chainer,wkentaro/chainer,ktnyt/chainer,ronekko/chainer,keisuke-umezawa/chainer,hvy/chainer,pfnet/chainer,niboshi/chainer,hvy/chainer,okuta/chainer,okuta/chainer,hvy/chainer,wkentaro/chainer,hvy/chainer,ktnyt/chainer,keisuke-umezawa/chainer,wkentaro/chainer,cupy/cupy,chainer/chainer,chainer/chainer,jnishi/chainer,ktnyt/chainer,okuta/chainer,tkerola/chainer,cupy/cupy,chainer/chainer,ysekky/chainer,rezoo/chainer