Vector of Intervals error message for actions(env, s)

[lilanger]

I want to design a new environment with two continuous actions. While implementing the function actions(env, s) I run into an iteration error, shouldn't I be able to set a vector here?

actions(env::NewEnvironment, s) = IntervalSet([-min_action_a, -min_action_b], [max_action_a, max_action_b])

My error states:

Error showing value of type LearnBase.IntervalSet{Array{Float64,1}}:
ERROR: MethodError: no method matching iterate(::LearnBase.IntervalSet{Array{Float64,1}})
Closest candidates are:
  iterate(::ExponentialBackOff) at error.jl:252
  iterate(::ExponentialBackOff, ::Any) at error.jl:252
  iterate(::Base.AsyncGenerator, ::Base.AsyncGeneratorState) at asyncmap.jl:382
  ...
Stacktrace:
 [1] isempty(::LearnBase.IntervalSet{Array{Float64,1}}) at .\essentials.jl:737
 [2] show(::IOContext{REPL.Terminals.TTYTerminal}, ::MIME{Symbol("text/plain")}, ::LearnBase.IntervalSet{Array{Float64,1}}) at .\show.jl:149
 [3] display(::REPL.REPLDisplay, ::MIME{Symbol("text/plain")}, ::Any) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:214
 [4] display(::REPL.REPLDisplay, ::Any) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:218
 [5] display(::Any) at .\multimedia.jl:328
 [6] #invokelatest#1 at .\essentials.jl:710 [inlined]
 [7] invokelatest at .\essentials.jl:709 [inlined]
 [8] print_response(::IO, ::Any, ::Bool, ::Bool, ::Any) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:238
 [9] print_response(::REPL.AbstractREPL, ::Any, ::Bool, ::Bool) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:223
 [10] (::REPL.var"#do_respond#54"{Bool,Bool,Atom.var"#246#247",REPL.LineEditREPL,REPL.LineEdit.Prompt})(::Any, ::Any, ::Any) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:822
 [11] #invokelatest#1 at .\essentials.jl:710 [inlined]
 [12] invokelatest at .\essentials.jl:709 [inlined]
 [13] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\LineEdit.jl:2355
 [14] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:1144
 [15] (::REPL.var"#38#42"{REPL.LineEditREPL,REPL.REPLBackendRef})() at .\task.jl:356

It would be nice to access something like

ACTION_BOUND_HI = actions(env, env.state).hi
ACTION_BOUND_LO = actions(env, env.state).lo

and get Arrays of the upper and lower bounds for both actions.