methods of closure Error showing value of type Base.MethodList

[TotalVerb]

julia> K(x) = y -> x
K (generic function with 1 method)

julia> methods(K(1))
# 1 method for generic function "(::#1)":
Error showing value of type Base.MethodList:
ERROR: type UnionAll has no field name
Stacktrace:
 [1] #show#365(::Nullable{DataType}, ::Function, ::IOContext{Base.Terminals.TTYTerminal}, ::Method) at ./methodshow.jl:95
 [2] (::Base.#kw##show)(::Array{Any,1}, ::Base.#show, ::IOContext{Base.Terminals.TTYTerminal}, ::Method) at ./<missing>:0
 [3] show_method_table(::IOContext{Base.Terminals.TTYTerminal}, ::Base.MethodList, ::Int64, ::Bool) at ./methodshow.jl:147
 [4] show(::IOContext{Base.Terminals.TTYTerminal}, ::MIME{Symbol("text/plain")}, ::Base.MethodList) at ./replutil.jl:4
 [5] display(::Base.REPL.REPLDisplay{Base.REPL.LineEditREPL}, ::MIME{Symbol("text/plain")}, ::Base.MethodList) at ./REPL.jl:122
 [6] display(::Base.REPL.REPLDisplay{Base.REPL.LineEditREPL}, ::Base.MethodList) at ./REPL.jl:125
 [7] display(::Base.MethodList) at ./multimedia.jl:183

possibly related: #20108, #19998