Sorry about inconvenience. CINT does not support arena argument for
operator new.
Give me a little time to implement this. I'm quit busy right now.
Masaharu Goto
> root [0] TClonesArray* a = new TClonesArray("Int_t",100);
> root [1] new((*a)[0]) Int_t(10);
> Warning: new((*a)[0]) Missing ';' FILE:/var/tmp/baaa0066a LINE:1
> root [2] .p (*a)[0]