prevent REPL from erroring in numbered mode in some situations

[KristofferC]

Should fix #49510.

@singularitti, could you try this?

[singularitti]

Sure, I can. How do I test, BTW? Is there a built version for this? Or I have to fix Julia source files in my installation?

[singularitti]

I tried modifying the stdlib files. Unfortunately, it still happens:

ChatGPT> Can you give me a quick example of exponentiating a matrix in Julia?
ERROR: type MD has no field args
Stacktrace:
  [1] getproperty
    @ ./Base.jl:37 [inlined]
  [2] get_usings!(usings::Vector{Any}, ex::Markdown.MD)
    @ REPL.Numbered ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:1425
  [3] out_transform(x::Any, n::Base.RefValue{Int64})
    @ REPL.Numbered ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:1415
  [4] (::REPL.Numbered.var"#5#6"{Base.RefValue{Int64}})(ast::Any)
    @ REPL.Numbered ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:1478
  [5] #invokelatest#2
    @ ./essentials.jl:816 [inlined]
  [6] invokelatest
    @ ./essentials.jl:813 [inlined]
  [7] eval_user_input(ast::Any, backend::REPL.REPLBackend, mod::Module)
    @ REPL ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:151
  [8] repl_backend_loop(backend::REPL.REPLBackend, get_module::Function)
    @ REPL ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:249
  [9] start_repl_backend(backend::REPL.REPLBackend, consumer::Any; get_module::Function)
    @ REPL ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:234
 [10] run_repl(repl::AbstractREPL, consumer::Any; backend_on_current_task::Bool, backend::Any)
    @ REPL ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:379
 [11] run_repl(repl::AbstractREPL, consumer::Any)
    @ REPL ~/.asdf/installs/julia/1.9.0/share/julia/stdlib/v1.9/REPL/src/REPL.jl:365
 [12] (::Base.var"#1017#1019"{Bool, Bool, Bool})(REPL::Module)
    @ Base ./client.jl:421
 [13] #invokelatest#2
    @ ./essentials.jl:816 [inlined]
 [14] invokelatest
    @ ./essentials.jl:813 [inlined]
 [15] run_main_repl(interactive::Bool, quiet::Bool, banner::Bool, history_file::Bool, color_set::Bool)
    @ Base ./client.jl:405
 [16] exec_options(opts::Base.JLOptions)
    @ Base ./client.jl:322
 [17] _start()
    @ Base ./client.jl:522

[singularitti]

I need to comment these lines in my startup.jl to make it work:

if !isdefined(repl, :interface)
    repl.interface = REPL.setup_interface(repl)
end
REPL.numbered_prompt!(repl)