Attempting to add a docstring to an anonymous function throws a BoundsError

[xal-0]

julia> "abcdf" function () end
ERROR: LoadError: BoundsError: attempt to access 0-element Vector{Any} at index [1]
Stacktrace:
 [1] throw_boundserror(A::Vector{Any}, I::Tuple{Int64})
   @ Base ./essentials.jl:14
 [2] getindex
   @ ./essentials.jl:916 [inlined]
 [3] astname(x::Expr, ismacro::Bool) (repeats 2 times)
   @ Base.Docs ./docs/Docs.jl:298
 [4] namify(x::Any)
   @ Base.Docs ./docs/Docs.jl:288
 [5] objectdoc(__source__::Any, __module__::Any, str::Any, def::Any, expr::Any, sig::Any)
   @ Base.Docs ./docs/Docs.jl:374
 [6] docm(source::LineNumberNode, mod::Module, meta::Any, ex::Any, define::Bool)
   @ Base.Docs ./docs/Docs.jl:594
 [7] docm(source::LineNumberNode, mod::Module, meta::Any, ex::Any)
   @ Base.Docs ./docs/Docs.jl:581
 [8] var"@doc"(::LineNumberNode, ::Module, ::String, ::Vararg{Any})
   @ Core ./boot.jl:646
in expression starting at REPL[1]:1