loading RCall in atreplinit fails because of RPrompt

[schlichtanders]

starting Julia with the following startup.jl file fails:

atreplinit() do repl
    try
        @eval begin
            using CondaPkg
            ENV["R_HOME"] = CondaPkg.envdir() * "/lib/R"

            import Pkg
            Pkg.build("RCall")

            using RCall
        end
    catch e
        @error "could not initialize julia" exception=(e, catch_backtrace())
    end
end

here the error:

│   exception =
│    InitError: UndefRefError: access to undefined reference
│    Stacktrace:
│      [1] getproperty
│        @ ./Base.jl:37 [inlined]
│      [2] repl_inited(repl::REPL.LineEditREPL)
│        @ RCall.RPrompt ~/.julia/packages/RCall/gOwEW/src/RPrompt.jl:241
│      [3] __init__()
│        @ RCall ~/.julia/packages/RCall/gOwEW/src/setup.jl:213
│      [4] register_restored_modules(sv::Core.SimpleVector, pkg::Base.PkgId, path::String)
│        @ Base ./loading.jl:1115
│      [5] _include_from_serialized(pkg::Base.PkgId, path::String, ocachepath::String, depmods::Vector{Any})
│        @ Base ./loading.jl:1061
│      [6] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt128)
│        @ Base ./loading.jl:1506
│      [7] _require(pkg::Base.PkgId, env::String)
│        @ Base ./loading.jl:1783
│      [8] _require_prelocked(uuidkey::Base.PkgId, env::String)
│        @ Base ./loading.jl:1660
│      [9] macro expansion
│        @ ./loading.jl:1648 [inlined]
│     [10] macro expansion
│        @ ./lock.jl:267 [inlined]
│     [11] require(into::Module, mod::Symbol)
│        @ Base ./loading.jl:1611
│     [12] top-level scope
│        @ ~/.julia/config/startup.jl:18
│     [13] eval
│        @ ./boot.jl:370 [inlined]
│     [14] (::var"#3#5")(repl::REPL.LineEditREPL)
│        @ Main ~/.julia/config/startup.jl:9
│     [15] __atreplinit(repl::REPL.LineEditREPL)
│        @ Base ./client.jl:372
│     [16] #invokelatest#2
│        @ ./essentials.jl:819 [inlined]
│     [17] invokelatest
│        @ ./essentials.jl:816 [inlined]
│     [18] _atreplinit
│        @ ./client.jl:379 [inlined]
│     [19] (::Base.var"#1017#1019"{Bool, Bool, Bool})(REPL::Module)
│        @ Base ./client.jl:420
│     [20] #invokelatest#2
│        @ ./essentials.jl:819 [inlined]
│     [21] invokelatest
│        @ ./essentials.jl:816 [inlined]
│     [22] run_main_repl(interactive::Bool, quiet::Bool, banner::Bool, history_file::Bool, color_set::Bool)
│        @ Base ./client.jl:405
│     [23] exec_options(opts::Base.JLOptions)
│        @ Base ./client.jl:322
│     [24] _start()
│        @ Base ./client.jl:522
│    during initialization of module RCall
└ @ Main ~/.julia/config/startup.jl:31

[schlichtanders]

Workaround

you apparently can use atreplinit() as follows

import REPL
atreplinit() do repl
    try
        # interface is needed for importing RCall
        repl.interface = REPL.setup_interface(repl)
...

and it works