Internal consistency check failed

Elixir and Erlang/OTP versions

elixir --version Erlang/OTP 24 [erts-12.2] [source] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1]

Elixir 1.13.4 (compiled with Erlang/OTP 24)

Operating system

Mac Os

Current behavior

I encountered a Internal consistency check failed today in our code base and managed to reproduce it with the following code:

defmodule CompilerBug do
  require Logger

  def from(order) do
    {a, b} =
      case order do
        "bar" ->
          {:bar, 1}

        "foo" ->
          {:foo, 2}

        s ->
          Logger.warn("Unexpected order: #{s}")
          :error
      end
  end
end

Pasting this code in iex will result in:

** (CompileError) Elixir.CompilerBug:1: function from/1+65:
  Internal consistency check failed - please report this bug.
  Instruction: {call_ext,4,{extfunc,'Elixir.Logger','__do_log__',4}}
  Error:       {allocated,undecided}:

    (stdlib 3.17) lists.erl:1342: :lists.foreach/2
    (elixir 1.13.4) src/elixir_erl_compiler.erl:12: anonymous fn/2 in :elixir_erl_compiler.spawn/1

Removing any of the three matching arms will result in the module compiling. Removing Logger.warn will also result in the module compiling. Replacing Logger.warn with IO.inspect will also result in the module compiling.

iex:

iex
Erlang/OTP 24 [erts-12.2] [source] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1]

Interactive Elixir (1.13.4) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)>

Expected behavior

Either compile the module or give a better error message

elixir-lang / elixir