Anonymous function has incorrect arity when contains other anon function

[Ljzn]

Elixir and Erlang/OTP versions

Erlang/OTP 26 [erts-14.2.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit]

Elixir 1.16.2 (compiled with Erlang/OTP 26)

Operating system

MacOS

Current behavior

  test "anoymous function arity error" do
    f = fn a -> a end
    f.(1)
    assert_raise(BadArityError, fn -> f.(1, 2) end)

    g = fn x, y -> x + y end
    f = fn a -> g.(a, 0) end

    f.(1)
    # this assertion failed
    assert_raise(BadArityError, fn -> f.(1, 2) end)
  end

Expected behavior

no incorrect arity

[josevalim]

Thanks for the report, I have reported it upstream, you can follow it here: erlang/otp#8316