REPL completion fails when propertynames throws an error

[oscardssmith]

MWE:

julia> struct A
       end
julia> Base.propertynames(::Type{A}) = error()
julia> A.┌ Error: Error in the keymap
│   exception =
│    
│    Stacktrace:
│      [1] error()
│        @ Base ./error.jl:44
│      [2] propertynames(::Type{A})
│        @ Main ./REPL[22]:1
│      [3] propertynames(x::Type, private::Bool)
│        @ Base ./reflection.jl:2557
│      [4] complete_symbol(ex::Any, name::String, ffunc::Any, context_module::Module)
│        @ REPL.REPLCompletions ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/REPLCompletions.jl:193
│      [5] complete_identifiers!(suggestions::Vector{REPL.REPLCompletions.Completion}, ffunc::Function, context_module::Module, string::String, name::String, pos::Int64, dotpos::Int64, startpos::Int64, comp_keywords::Bool)
│        @ REPL.REPLCompletions ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/REPLCompletions.jl:1108
│      [6] completions(string::String, pos::Int64, context_module::Module, shift::Bool)
│        @ REPL.REPLCompletions ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/REPLCompletions.jl:1325
│      [7] complete_line(c::REPL.REPLCompletionProvider, s::REPL.LineEdit.PromptState, mod::Module)
│        @ REPL ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/REPL.jl:560
│      [8] check_for_hint(s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:384
│      [9] (::REPL.LineEdit.var"#139#195")(s::REPL.LineEdit.MIState, data::Any, c::Union{Char, SubString{String}, String})
│        @ REPL.LineEdit ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2506
│     [10] #invokelatest#2
│        @ Base ./essentials.jl:955 [inlined]
│     [11] invokelatest
│        @ Base ./essentials.jl:952 [inlined]
│     [12] (::REPL.LineEdit.var"#27#28"{REPL.LineEdit.var"#139#195", String})(s::Any, p::Any)
│        @ REPL.LineEdit ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:1690
│     [13] prompt!(term::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2827
│     [14] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2729
│     [15] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
│        @ REPL ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1352
│     [16] (::REPL.var"#64#70"{REPL.LineEditREPL, REPL.REPLBackendRef})()
│        @ REPL ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/REPL.jl:401
└ @ REPL.LineEdit ~/dist/julia-cedar/vanilla/latest/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2829