Cannot read variable in local scope

using DataFrames
using Dates

using RuntimeGeneratedFunctions
RuntimeGeneratedFunctions.init(@__MODULE__)

w = Base.get_world_counter()

function Base.show(io::IO, mime::MIME"text/plain", df::AbstractDataFrame; kwargs...)
    fn = @RuntimeGeneratedFunction(:(
        (v, i::Int, j::Int) -> begin
            println(mime) # <- This fails
            typeof(v) <: DateTime ? Dates.format(v, "dd-mm-yyyy HH:MM") : v
        end
    ))

    Base.invoke_in_world(w, Base.show,
        io,
        mime,
        df;
        formatters=fn,
        kwargs...
    )
end

The result of the code above is:

UndefVarError: mime not defined

Am i doing something wrong?

Start by reproducing the Julia example in the issue and trace the RuntimeGeneratedFunction entry point used to build the formatter closure. Determine how the local mime binding is handled, and consider the issue complete when the example can access that binding without raising UndefVarError.