Invalid docstring metadata with call syntax + where or return type annotation

[mortenpi]

The following module

module Docerr
struct TestStruct1 end
struct TestStruct2 end
struct TestStruct3 end

"standard"
(baz::TestStruct1)(a::Int) = 0

"parametric"
(foo::TestStruct2)(a::T) where T = 0

"return"
(bar::TestStruct3)(a::Int, b::Int) :: Int = 0
end

leads to the following docstring metadata:

julia> Docs.meta(Docerr)
IdDict{Any, Any} with 3 entries:
  Main.Docerr.TestStruct1 => MultiDoc(Type[Tuple{Int64}], IdDict{Any, Any}(Tuple{Int64}=>DocStr(svec("standard"), nothing, Dict{Symbol, Any}(:typesig=>Tuple{Int64}, :module=>Main.Docerr, :linenumber=>6, :binding=…
  Main.Docerr.foo         => MultiDoc(Type[Tuple{T} where T], IdDict{Any, Any}(Tuple{T} where T=>DocStr(svec("parametric"), nothing, Dict{Symbol, Any}(:typesig=>Tuple{T} where T, :module=>Main.Docerr, :linenumber…
  Main.Docerr.bar         => MultiDoc(Type[Tuple{Int64, Int64}], IdDict{Any, Any}(Tuple{Int64, Int64}=>DocStr(svec("return"), nothing, Dict{Symbol, Any}(:typesig=>Tuple{Int64, Int64}, :module=>Main.Docerr, :linen…

In other words, when using the call syntax with either parametric types or a return type, the docstring gets attached to a "binding" named after the arbitrary variable name in the call syntax. You can actually pull up the docstring via Docerr.foo in the REPL help, even though that makes no sense.