Markdown print error in 1.12.0-DEV

[huangyxi]

Reproduction

1. Run julia with version v1.12.0-DEV.
2. Type ]? to display Pkg help, which is a markdown document.

$ julia +nightly
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.12.0-DEV.810 (2024-07-02)
 _/ |\__'_|_|_|\__'_|  |  Commit 11939977732 (0 days old master)
|__/                   |

(v1.12) pkg> ?
  Welcome to the Pkg REPL-mode. To return to the julia> prompt, either press backspace
  when the input line is empty or press Ctrl+C.

  Full documentation available at https://pkgdocs.julialang.org/

  Synopsis

ERROR: UndefVarError: `lines` not defined in `Markdown`
Suggestion: check for spelling errors or missing imports.
Stacktrace:
  [1] term(io::Base.TTY, md::Markdown.Code, columns::Int64)
    @ OhMyREPL ~/.julia/packages/OhMyREPL/HzW5x/src/MarkdownHighlighter.jl:55
  [2] term(io::Base.TTY, content::Vector{Any}, cols::Int64)
    @ Markdown ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Markdown/src/render/terminal/render.jl:10
  [3] term (repeats 2 times)
    @ ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Markdown/src/render/terminal/render.jl:16 [inlined]
  [4] show
    @ ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Markdown/src/render/terminal/render.jl:226 [inlined]
  [5] do_help!(command::Pkg.REPLMode.Command, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Pkg/src/REPLMode/REPLMode.jl:421
  [6] #invokelatest#2
    @ ./essentials.jl:1045 [inlined]
  [7] invokelatest
    @ ./essentials.jl:1042 [inlined]
  [8] do_cmd(command::Pkg.REPLMode.Command, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Pkg/src/REPLMode/REPLMode.jl:400
  [9] do_cmds(commands::Vector{Pkg.REPLMode.Command}, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Pkg/src/REPLMode/REPLMode.jl:393
 [10] do_cmds(repl::REPL.LineEditREPL, commands::String)
    @ REPLExt ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Pkg/ext/REPLExt/REPLExt.jl:99
 [11] on_done(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool, repl::REPL.LineEditREPL)
    @ REPLExt ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Pkg/ext/REPLExt/REPLExt.jl:113
 [12] #invokelatest#2
    @ ./essentials.jl:1045 [inlined]
 [13] invokelatest
    @ ./essentials.jl:1042 [inlined]
 [14] (::REPLExt.var"#43#46"{REPL.LineEditREPL})(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool)
    @ REPLExt ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/Pkg/ext/REPLExt/REPLExt.jl:135
 [15] #invokelatest#2
    @ ./essentials.jl:1045 [inlined]
 [16] invokelatest
    @ ./essentials.jl:1042 [inlined]
 [17] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2748
 [18] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/REPL.jl:1496
 [19] (::REPL.var"#75#81"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/REPL.jl:501

(v1.12) pkg>