StackOverflowError using Type as colour

[evan-wehi]

using Gadfly
df = DataFrame(x=[1, 2], y=[1, 2], colour=[Int, Float64])
plot(df, x=:x, y=:y, color=:colour, Geom.line)

produces

Error showing value of type Gadfly.Plot:
ERROR: StackOverflowError:
Stacktrace:
     [1] parse_colorant(c::Type)
       @ Compose ~/.julia/packages/Compose/h4MDD/src/Compose.jl:45
     [2] (::Compose.var"#1#2")(x::Type)
       @ Compose ./none:0
     [3] iterate(::Base.Generator{Tuple{DataType}, Compose.var"#1#2"})
       @ Base ./generator.jl:47
     [4] collect(itr::Base.Generator{Tuple{DataType}, Compose.var"#1#2"})
       @ Base ./array.jl:724
     [5] parse_colorant(c::Tuple{DataType})
       @ Compose ~/.julia/packages/Compose/h4MDD/src/Compose.jl:44
--- the last 5 lines are repeated 8369 more times ---
 [41851] parse_colorant(c::Type)
       @ Compose ~/.julia/packages/Compose/h4MDD/src/Compose.jl:45
 [41852] (::Compose.var"#48#49")(c::Type)
       @ Compose ./none:0
 [41853] iterate
       @ ./generator.jl:47 [inlined]
 [41854] collect
       @ ./array.jl:724 [inlined]
 [41855] stroke(cs::Vector{DataType})
       @ Compose ~/.julia/packages/Compose/h4MDD/src/property.jl:56
 [41856] render(geom::Gadfly.Geom.LineGeometry, theme::Theme, aes::Gadfly.Aesthetics)
       @ Gadfly.Geom ~/.julia/packages/Gadfly/B5yQc/src/geom/line.jl:154
 [41857] render(geom::Gadfly.Geom.LineGeometry, theme::Theme, aes::Gadfly.Aesthetics, subplot_layer_aess::Vector{Gadfly.Aesthetics}, subplot_layer_datas::Vector{Gadfly.Data}, scales::Dict{Symbol, Gadfly.ScaleElement})
       @ Gadfly.Geom ~/.julia/packages/Gadfly/B5yQc/src/geometry.jl:45
 [41858] (::Gadfly.var"#128#130"{Dict{Symbol, Gadfly.ScaleElement}})(::Tuple{Gadfly.Layer, Gadfly.Aesthetics, Vector{Gadfly.Aesthetics}, Vector{Gadfly.Data}, Theme})
       @ Gadfly ./none:0
 [41859] iterate
       @ ./generator.jl:47 [inlined]
 [41860] collect(itr::Base.Generator{Base.Iterators.Zip{Tuple{Vector{Gadfly.Layer}, Vector{Gadfly.Aesthetics}, Vector{Vector{Gadfly.Aesthetics}}, Vector{Vector{Gadfly.Data}}, Vector{Theme}}}, Gadfly.var"#128#130"{Dict{Symbol, Gadfly.ScaleElement}}})
       @ Base ./array.jl:724
 [41861] render_prepared(plot::Gadfly.Plot, coord::Gadfly.Coord.Cartesian, plot_aes::Gadfly.Aesthetics, layer_aess::Vector{Gadfly.Aesthetics}, layer_stats::Vector{Vector{Gadfly.StatisticElement}}, layer_subplot_aess::Vector{Vector{Gadfly.Aesthetics}}, layer_subplot_datas::Vector{Vector{Gadfly.Data}}, scales::Dict{Symbol, Gadfly.ScaleElement}, guides::Vector{Gadfly.GuideElement}; table_only::Bool, dynamic::Bool)
       @ Gadfly ~/.julia/packages/Gadfly/B5yQc/src/Gadfly.jl:802
 [41862] render_prepared(plot::Gadfly.Plot, coord::Gadfly.Coord.Cartesian, plot_aes::Gadfly.Aesthetics, layer_aess::Vector{Gadfly.Aesthetics}, layer_stats::Vector{Vector{Gadfly.StatisticElement}}, layer_subplot_aess::Vector{Vector{Gadfly.Aesthetics}}, layer_subplot_datas::Vector{Vector{Gadfly.Data}}, scales::Dict{Symbol, Gadfly.ScaleElement}, guides::Vector{Gadfly.GuideElement})
       @ Gadfly ~/.julia/packages/Gadfly/B5yQc/src/Gadfly.jl:794
 [41863] render(plot::Gadfly.Plot)
       @ Gadfly ~/.julia/packages/Gadfly/B5yQc/src/Gadfly.jl:740
 [41864] draw
       @ ~/.julia/packages/Gadfly/B5yQc/src/Gadfly.jl:843 [inlined]
 [41865] show(io::IOBuffer, m::MIME{Symbol("text/html")}, p::Gadfly.Plot)
       @ Gadfly ~/.julia/packages/Gadfly/B5yQc/src/Gadfly.jl:933
 [41866] show(io::IOBuffer, m::String, x::Gadfly.Plot)
       @ Base.Multimedia ./multimedia.jl:111
 [41867] display(d::VSCodeServer.InlineDisplay, m::MIME{Symbol("juliavscode/html")}, x::Gadfly.Plot)
       @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.5.11/scripts/packages/VSCodeServer/src/display.jl:0
 [41868] display(d::VSCodeServer.InlineDisplay, mime::String, x::Any)
       @ Base.Multimedia ./multimedia.jl:216
 [41869] display(d::VSCodeServer.InlineDisplay, x::Gadfly.Plot)
       @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.5.11/scripts/packages/VSCodeServer/src/display.jl:156
 [41870] display(x::Any)
       @ Base.Multimedia ./multimedia.jl:328
 [41871] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{Nothing, AbstractDisplay})
       @ REPL ~/Applications/Julia-1.7.app/Contents/Resources/julia/share/julia/stdlib/v1.7/REPL/src/REPL.jl:0
 [41872] (::REPL.var"#45#46"{REPL.LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
       @ REPL ~/Applications/Julia-1.7.app/Contents/Resources/julia/share/julia/stdlib/v1.7/REPL/src/REPL.jl:275
 [41873] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
       @ REPL ~/Applications/Julia-1.7.app/Contents/Resources/julia/share/julia/stdlib/v1.7/REPL/src/REPL.jl:508
 [41874] print_response(repl::REPL.AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
       @ REPL ~/Applications/Julia-1.7.app/Contents/Resources/julia/share/julia/stdlib/v1.7/REPL/src/REPL.jl:273
 [41875] (::REPL.var"#do_respond#66"{Bool, Bool, REPL.var"#77#87"{REPL.LineEditREPL, REPL.REPLHistoryProvider}, REPL.LineEditREPL, REPL.LineEdit.Prompt})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
       @ REPL ~/Applications/Julia-1.7.app/Contents/Resources/julia/share/julia/stdlib/v1.7/REPL/src/REPL.jl:844
 [41876] #invokelatest#2
       @ ./essentials.jl:716 [inlined]
 [41877] invokelatest
       @ ./essentials.jl:714 [inlined]
 [41878] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
       @ REPL.LineEdit ~/Applications/Julia-1.7.app/Contents/Resources/julia/share/julia/stdlib/v1.7/REPL/src/LineEdit.jl:2493
 [41879] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
       @ REPL ~/Applications/Julia-1.7.app/Contents/Resources/julia/share/julia/stdlib/v1.7/REPL/src/REPL.jl:1230

Workaround is to convert the Type to a string.