Why does the following derivative vanish?
f:=k->(y->y^k);
h:=z->f(2)(z);
D(h);
Note: I am aware that setting h:=f(2) would give the correct result. However, I would like to use the arrow -> notation in a more complicated problem. Also, it seems odd that the plot(h) displays the graph of z->z^2, while D(h) gives 0.
