Tab completion can't always determine field names

[00vareladavid]

Tab completion fails to infer field names:

julia> Pkg.dependencies()[Pkg.project().dependencies["Revise"]].┌ Error: Error in the keymap                                                                                                   
│   exception =                                                                                                                                                                                
│    BoundsError: attempt to access 1-element Array{Any,1} at index [2]

But it has no trouble when broken down in two steps:

julia> x = Pkg.dependencies()[Pkg.project().dependencies["Revise"]];

julia> x.
dependencies         git_source            is_pinned             is_tracking_registry  name                  tree_hash
git_revision         is_direct_dep         is_tracking_path      is_tracking_repo      source                version

Stack trace

``` julia> Pkg.dependencies()[Pkg.project().dependencies["Revise"]].┌ Error: Error in the keymap │ exception = │ BoundsError: attempt to access 1-element Vector{Any} at index [2] │ Stacktrace: │ [1] getindex │ @ ./array.jl:801 [inlined] │ [2] get_value_getfield(ex::Expr, fn::Module) (repeats 2 times) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:392 │ [3] try_get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:436 │ [4] try_get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:448 │ [5] get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:457 │ [6] get_type_call(expr::Expr) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:411 │ [7] try_get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:439 │ [8] try_get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:446 │ [9] get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:457 │ [10] get_type_call(expr::Expr) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:411 │ [11] try_get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:439 │ [12] try_get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:446 │ [13] get_type(sym::Expr, fn::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:457 │ [14] complete_symbol(sym::String, ffunc::REPL.REPLCompletions.var"#34#37", context_module::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:153 │ [15] completions(string::String, pos::Int64, context_module::Module) │ @ REPL.REPLCompletions /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:774 │ [16] completions │ @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPLCompletions.jl:638 [inlined] │ [17] complete_line(c::REPL.REPLCompletionProvider, s::REPL.LineEdit.PromptState) │ @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:439 │ [18] complete_line(s::REPL.LineEdit.PromptState, repeats::Int64) │ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:348 │ [19] complete_line(s::REPL.LineEdit.MIState) │ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:339 │ [20] edit_tab(s::REPL.LineEdit.MIState, jump_spaces::Bool, delete_trailing::Bool) (repeats 2 times) │ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:2118 │ [21] (::REPL.LineEdit.var"#109#162")(::REPL.LineEdit.MIState, ::Any, ::Vararg{Any, N} where N) │ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:2159 │ [22] #invokelatest#2 │ @ ./essentials.jl:708 [inlined] │ [23] invokelatest │ @ ./essentials.jl:706 [inlined] │ [24] (::REPL.LineEdit.var"#22#23"{REPL.LineEdit.var"#109#162", String})(s::Any, p::Any) │ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:1414 │ [25] prompt!(term::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState) │ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:2534 │ [26] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState) │ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:2436 │ [27] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef) │ @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:1126 │ [28] (::REPL.var"#44#49"{REPL.LineEditREPL, REPL.REPLBackendRef})() │ @ REPL ./task.jl:406 └ @ REPL.LineEdit /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:2536

</details>

[vtjnash]

Probably a duplicate of #27184 and others