showing Dict types got a lot slower (300x)

[KristofferC]

1.5:

julia> @btime sprint(show, Dict{String, Any})
  1.300 μs (21 allocations: 1.03 KiB)
"Dict{String,Any}"

1.6:

julia> @btime sprint(show, Dict{String, Any})
  348.819 μs (32 allocations: 21.31 KiB)
"Dict{String, Any}"

Trace is

 1╎    ╎    ╎     363 @Base/strings/io.jl:105; sprint(f::Function, args::Type; context::Nothing, sizehint::I...
  ╎    ╎    ╎    ╎ 359 @Base/show.jl:763; show(io::IOBuffer, x::Type)
 2╎    ╎    ╎    ╎  359 @Base/show.jl:637; show_typealias(io::IOBuffer, x::Type)
  ╎    ╎    ╎    ╎   158 @Base/show.jl:551; make_typealias(x::Type)
  ╎    ╎    ╎    ╎    158 @Base/reflection.jl:98; names
68╎    ╎    ╎    ╎     158 @Base/reflection.jl:98; #names#10
  ╎    ╎    ╎    ╎    ╎ 90  @Base/sort.jl:735; sort!
  ╎    ╎    ╎    ╎    ╎  90  @Base/sort.jl:747; #sort!#8
  ╎    ╎    ╎    ╎    ╎   90  @Base/sort.jl:687; sort!
  ╎    ╎    ╎    ╎    ╎    90  @Base/sort.jl:616; sort!
  ╎    ╎    ╎    ╎    ╎     45  @Base/sort.jl:622; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base....
  ╎    ╎    ╎    ╎    ╎    ╎ 21  @Base/sort.jl:622; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎  13  @Base/sort.jl:623; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎ 15  @Base/sort.jl:623; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎  8   @Base/sort.jl:623; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎   6   @Base/sort.jl:622; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Bas...
  ╎    ╎    ╎    ╎    ╎     33  @Base/sort.jl:623; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base....
  ╎    ╎    ╎    ╎    ╎    ╎ 12  @Base/sort.jl:622; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎  7   @Base/sort.jl:622; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎ 19  @Base/sort.jl:623; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎  11  @Base/sort.jl:623; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Base...
  ╎    ╎    ╎    ╎    ╎    ╎   6   @Base/sort.jl:622; sort!(v::Vector{Symbol}, lo::Int64, hi::Int64, a::Bas...
54╎    ╎    ╎    ╎   96  @Base/show.jl:552; make_typealias(x::Type)
27╎    ╎    ╎    ╎    27  @Base/reflection.jl:102; isdeprecated
68╎    ╎    ╎    ╎   77  @Base/show.jl:554; make_typealias(x::Type)

This is related to the fancy typealias printing but is there a way to perhaps limit that to e.g. REPL usage.

Ref #36107
Ref #37989.

[yuyichao]

Did you reverse the result or is 1.6 actually faster?

[KristofferC]

I reversed, sorry, updated.