Pkg prompt crashes when you press shift + tab

[LilithHafner]

You can get an internal error in 3 keystrokes :)

], then shift + tab

x@x ~ % julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _' |  |
  | | |_| | | | (_| |  |  Version 1.10.0-alpha1 (2023-07-06)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.10) pkg> ┌ Error: Error in the keymap
│   exception =
│    MethodError: no method matching setmodifiers!(::Pkg.REPLMode.PkgCompletionProvider, ::REPL.LineEdit.Modifiers)
│    
│    Closest candidates are:
│      setmodifiers!(::REPL.REPLCompletionProvider, ::REPL.LineEdit.Modifiers)
│       @ REPL ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:509
│      setmodifiers!(::REPL.LineEdit.Prompt, ::REPL.LineEdit.Modifiers)
│       @ REPL ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2057
│      setmodifiers!(::REPL.LineEdit.MIState, ::REPL.LineEdit.Modifiers)
│       @ REPL ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2056
│      ...
│    
│    Stacktrace:
│      [1] setmodifiers!(p::REPL.LineEdit.Prompt, m::REPL.LineEdit.Modifiers)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2057
│      [2] setmodifiers!(s::REPL.LineEdit.MIState, m::REPL.LineEdit.Modifiers)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2056
│      [3] shift_tab_completion(s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2328 [inlined]
│      [4] (::REPL.LineEdit.var"#115#171")(::REPL.LineEdit.MIState, ::Any, ::Vararg{Any})
│        @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2368
│      [5] invokelatest(::REPL.LineEdit.var"#115#171", ::Any, ::Any, ::String; kwargs::@Kwargs{})
│        @ Base ./essentials.jl:867 [inlined]
│      [6] invokelatest(::REPL.LineEdit.var"#115#171", ::Any, ::Any, ::String)
│        @ Base ./essentials.jl:864 [inlined]
│      [7] (::REPL.LineEdit.var"#27#28"{REPL.LineEdit.var"#115#171", String})(s::Any, p::Any)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:1612
│      [8] prompt!(term::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2749
│      [9] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2651
│     [10] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
│        @ REPL ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:1297
│     [11] (::REPL.var"#62#68"{REPL.LineEditREPL, REPL.REPLBackendRef})()
│        @ REPL ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:373
└ @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.0-alpha1+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2751
julia> 

Thanks to @tecosaur for finding this

[tecosaur]

Already reported in #49435 🙂