cling cannot print non-fully qualified types

root [0] ROOT::Experimental::TDataFrame d(10)

(ROOT::Experimental::TDataFrame &) A data frame that will create 10 entries

root [1] auto dd = d.Define("a", []{ return 1;})

input_line_15:2:58: error: template argument for template type parameter must be a type

 cling::printValue(*(ROOT::Experimental::TDF::TInterface<TCustomColumnBase>**)0x7fffccad0e80);

                                                         ^~~~~~~~~~~~~~~~~

/home/eguiraud/ROOT/root_build/include/ROOT/TDFInterface.hxx:99:23: note: template parameter is declared here

   template <typename T>

                      ^

ERROR in cling's callPrintValue(): cannot pass value!

(ROOT::Experimental::TDF::TInterface<TCustomColumnBase> &) ERROR in cling's callPrintValue(): missing value string.

root [2]