Uncaught exceptions from RDataFrame operations exit root prompt.

root [0] auto df = ROOT::RDataFrame(10)

(ROOT::RDataFrame &) An empty data frame that will create 10 entries

root [1] auto h = df.Hist1D("..")

ROOT_prompt_1:1:13: error: no member named 'Hist1D' in 'ROOT::RDataFrame'

auto h = df.Hist1D("..")

         ~~ ^

root [2]

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  | Welcome to ROOT 6.23/01                        https://root.cern |

  | (c) 1995-2020, The ROOT Team; conception: R. Brun, F. Rademakers |

  | Built for macosx64 on Jul 30 2020, 16:15:57                      |

  | From heads/master@v6-23-01-782-geaa388adba1                      |

  | With Apple clang version 11.0.3 (clang-1103.0.32.62)             |

  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q'       |

   ------------------------------------------------------------------

root [0] auto tree = new TTree("T","An example of ROOT tree with a few branches");

root [1]  double x;

root [2]  tree->Branch("x",&x);

root [3]  for(int i=0; i<100; ++i){ x = gRandom->Rndm(); tree->Fill(); }

root [4]  using namespace ROOT;

root [5]  auto df = RDataFrame( *tree);

root [6]  auto h1 = df.Histo1D("x");    // OK, "x" exists.

root [7] auto h2 = df.Histo1D("y")

libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: Unknown column: y