Julia: "MethodError: no method matching iterate(::Symbol)" during tab-completion

[staticfloat]

ZMQ.jl's Message type breaks tab completion:

using ZMQ
z = ZMQ.Message()
z.<TAB>

results in:

julia> z.┌ Error: Error in the keymap
│   exception =
│    MethodError: no method matching iterate(::Symbol)
│    Closest candidates are:
│      iterate(::Base.EnvDict) at env.jl:119
│      iterate(::Base.EnvDict, ::Any) at env.jl:119
│      iterate(::ExponentialBackOff) at error.jl:252
│      ...
│    Stacktrace:
│     [1] complete_symbol(::String, ::REPL.REPLCompletions.var"#21#25", ::Module) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/REPLCompletions.jl:147
│     [2] completions(::String, ::Int64, ::Module) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/REPLCompletions.jl:716
│     [3] completions(::String, ::Int64) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/REPLCompletions.jl:580
│     [4] complete_line(::REPL.REPLCompletionProvider, ::Any) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/REPL.jl:462
│     [5] complete_line(::REPL.LineEdit.PromptState, ::Any) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:329
│     [6] complete_line(::REPL.LineEdit.MIState) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:320
│     [7] edit_tab(::REPL.LineEdit.MIState, ::Any, ::Any) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:2032 (repeats 2 times)
│     [8] (::REPL.LineEdit.var"#109#162")(::Any, ::Any, ::Vararg{Any,N} where N) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:2073
│     [9] #invokelatest#1 at ./essentials.jl:710 [inlined]
│     [10] invokelatest at ./essentials.jl:709 [inlined]
│     [11] (::REPL.LineEdit.var"#22#23"{REPL.LineEdit.var"#109#162",String})(::Any, ::Any) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:1364
│     [12] prompt!(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:2446
│     [13] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:2349
│     [14] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at /Users/sabae/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/REPL.jl:1141
│     [15] (::REPL.var"#36#40"{REPL.LineEditREPL,REPL.REPLBackendRef})() at ./task.jl:358
└ @ REPL.LineEdit ~/tmp/julia-build/julia-master/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:2448

This is happening consistently on Julia v1.4, v1.5 and latest master. The version of ZMQ installed is v1.2.0.

[mbauman]

I'd guess this is a ZMQ bug:

https://github.com/JuliaInterop/ZMQ.jl/blob/a65c423dcd6fa1136e6150cf488956abfbebd2ca/src/message.jl#L145

Base.propertynames(zmsg::Message) = (:more)

That is missing a comma. It should return a tuple.

[Keno]

The REPL should be robust to this, I think.