Undefined symbols for architecture arm64:
  "_roc_fx_dir_create", referenced from:
      _roc_fx_dir_create_fastcc_wrapper in roc_appRopdbV.o
ld: symbol(s) not found for architecture arm64
main: is already signed
thread 'main' panicked at crates/compiler/build/src/program.rs:1037:17:
not yet implemented: linker failed with exit code Some(1)
stack backtrace:
   0: rust_begin_unwind
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:647:5
   1: core::panicking::panic_fmt
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/panicking.rs:72:14
   2: roc_build::program::build_loaded_file
   3: roc_build::program::build_file
   4: roc_cli::build
   5: roc::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

app [Model, init!, respond!] {
    web: platform "https://github.com/roc-lang/basic-webserver/releases/download/0.12.0/Q4h_In-sz1BqAvlpmCsBHhEJnn_YvfRRMiNACB_fBbk.tar.br",
}

import web.Dir

Model : {}

init! : {} => Result Model []
init! = |{}| Ok({})

respond! = |_req, _model|

    Dir.create!("test_dir")?

    Ok({ status: 200, headers: [], body: "Hello, world!" |> Str.to_utf8 })