Protocol.UndefinedError with Elixir 1.14

[ninoseki]

I got the following errors when I try to use EasySSL with Elixir 1.14.
(Sorry I'm an Elixir newbie and I cannot guess a root cause but let me report)

$ elixir  --version                                                                                                                                                                         11:38:54
Erlang/OTP 25 [erts-13.2] [source] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1] [jit] [dtrace]

Elixir 1.14.4 (compiled with Erlang/OTP 23)

$ mix test                                                                                                                                                                                  11:38:39
warning: use Mix.Config is deprecated. Use the Config module instead
  config/config.exs:3

Compiling 1 file (.ex)


  1) test parses signature algorithm correctly (EasySSLTest)
     test/easy_ssl_test.exs:112
     ** (Protocol.UndefinedError) protocol Enumerable not implemented for <<48, 42, 48, 40, 160, 38, 160, 36, 134, 34, 104, 116, 116, 112, 58, 47, 47, 99, 114, 108, 46, 103, 111, 100, 97, 100, 100, 121, 46, 99, 111, 109, 47, 103, 100, 115, 49, 45, 57, 48, 46, 99, 114, 108>> of type BitString. This protocol is implemented for the following type(s): Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream
     code: cert = File.read!(@pem_cert_dir <> "acaline.com.crt") |> EasySSL.parse_pem()
     stacktrace:
       (elixir 1.14.4) lib/enum.ex:1: Enumerable.impl_for!/1
       (elixir 1.14.4) lib/enum.ex:166: Enumerable.reduce/3
       (elixir 1.14.4) lib/enum.ex:4307: Enum.reduce/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:523: anonymous fn/2 in EasySSL.parse_extensions/1
       (elixir 1.14.4) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:86: EasySSL.parse_der/2
       test/easy_ssl_test.exs:113: (test)

..

  2) test parses all certifiates in @pem_cert_dir directory (EasySSLTest)
     test/easy_ssl_test.exs:34
     ** (Protocol.UndefinedError) protocol Enumerable not implemented for <<48, 42, 48, 40, 160, 38, 160, 36, 134, 34, 104, 116, 116, 112, 58, 47, 47, 99, 114, 108, 46, 103, 111, 100, 97, 100, 100, 121, 46, 99, 111, 109, 47, 103, 100, 115, 49, 45, 57, 48, 46, 99, 114, 108>> of type BitString. This protocol is implemented for the following type(s): Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream
     code: |> Enum.each(fn cert_filename ->
     stacktrace:
       (elixir 1.14.4) lib/enum.ex:1: Enumerable.impl_for!/1
       (elixir 1.14.4) lib/enum.ex:166: Enumerable.reduce/3
       (elixir 1.14.4) lib/enum.ex:4307: Enum.reduce/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:523: anonymous fn/2 in EasySSL.parse_extensions/1
       (elixir 1.14.4) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:86: EasySSL.parse_der/2
       test/easy_ssl_test.exs:38: anonymous fn/1 in EasySSLTest."test parses all certifiates in @pem_cert_dir directory"/1
       (elixir 1.14.4) lib/enum.ex:975: Enum."-each/2-lists^foreach/1-0-"/2
       test/easy_ssl_test.exs:36: (test)

.

  3) test parses subject and issuer correctly (EasySSLTest)
     test/easy_ssl_test.exs:103
     ** (Protocol.UndefinedError) protocol Enumerable not implemented for <<48, 90, 48, 43, 160, 41, 160, 39, 134, 37, 104, 116, 116, 112, 58, 47, 47, 99, 114, 108, 51, 46, 100, 105, 103, 105, 99, 101, 114, 116, 46, 99, 111, 109, 47, 101, 118, 99, 97, 49, 45, 103, 50, 46, 99, 114, 108, 48, 43, 160, ...>> of type BitString. This protocol is implemented for the following type(s): Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream
     code: cert = File.read!(@pem_cert_dir <> "github.com.crt") |> EasySSL.parse_pem()
     stacktrace:
       (elixir 1.14.4) lib/enum.ex:1: Enumerable.impl_for!/1
       (elixir 1.14.4) lib/enum.ex:166: Enumerable.reduce/3
       (elixir 1.14.4) lib/enum.ex:4307: Enum.reduce/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:523: anonymous fn/2 in EasySSL.parse_extensions/1
       (elixir 1.14.4) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:86: EasySSL.parse_der/2
       test/easy_ssl_test.exs:104: (test)



  4) test parses validity dates correctly (EasySSLTest)
     test/easy_ssl_test.exs:89
     ** (Protocol.UndefinedError) protocol Enumerable not implemented for <<48, 90, 48, 43, 160, 41, 160, 39, 134, 37, 104, 116, 116, 112, 58, 47, 47, 99, 114, 108, 51, 46, 100, 105, 103, 105, 99, 101, 114, 116, 46, 99, 111, 109, 47, 101, 118, 99, 97, 49, 45, 103, 50, 46, 99, 114, 108, 48, 43, 160, ...>> of type BitString. This protocol is implemented for the following type(s): Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream
     code: cert = File.read!(@pem_cert_dir <> "github.com.crt") |> EasySSL.parse_pem()
     stacktrace:
       (elixir 1.14.4) lib/enum.ex:1: Enumerable.impl_for!/1
       (elixir 1.14.4) lib/enum.ex:166: Enumerable.reduce/3
       (elixir 1.14.4) lib/enum.ex:4307: Enum.reduce/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:523: anonymous fn/2 in EasySSL.parse_extensions/1
       (elixir 1.14.4) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:86: EasySSL.parse_der/2
       test/easy_ssl_test.exs:90: (test)



  5) test parses all certifiates in @der_cert_dir directory (EasySSLTest)
     test/easy_ssl_test.exs:21
     ** (Protocol.UndefinedError) protocol Enumerable not implemented for <<48, 60, 48, 58, 160, 56, 160, 54, 134, 52, 104, 116, 116, 112, 58, 47, 47, 99, 114, 108, 46, 103, 108, 111, 98, 97, 108, 115, 105, 103, 110, 46, 99, 111, 109, 47, 103, 115, 47, 103, 115, 111, 114, 103, 97, 110, 105, 122, 97, 116, ...>> of type BitString. This protocol is implemented for the following type(s): Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream
     code: |> Enum.each(fn cert_filename ->
     stacktrace:
       (elixir 1.14.4) lib/enum.ex:1: Enumerable.impl_for!/1
       (elixir 1.14.4) lib/enum.ex:166: Enumerable.reduce/3
       (elixir 1.14.4) lib/enum.ex:4307: Enum.reduce/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:523: anonymous fn/2 in EasySSL.parse_extensions/1
       (elixir 1.14.4) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:86: EasySSL.parse_der/2
       test/easy_ssl_test.exs:25: anonymous fn/1 in EasySSLTest."test parses all certifiates in @der_cert_dir directory"/1
       (elixir 1.14.4) lib/enum.ex:975: Enum."-each/2-lists^foreach/1-0-"/2
       test/easy_ssl_test.exs:23: (test)



  6) test parses and adds all domains to the top level leaf node (EasySSLTest)
     test/easy_ssl_test.exs:59
     ** (Protocol.UndefinedError) protocol Enumerable not implemented for <<48, 57, 48, 55, 160, 53, 160, 51, 134, 49, 104, 116, 116, 112, 58, 47, 47, 69, 86, 83, 101, 99, 117, 114, 101, 45, 99, 114, 108, 46, 118, 101, 114, 105, 115, 105, 103, 110, 46, 99, 111, 109, 47, 69, 86, 83, 101, 99, 117, 114, ...>> of type BitString. This protocol is implemented for the following type(s): Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream
     code: |> EasySSL.parse_der()
     stacktrace:
       (elixir 1.14.4) lib/enum.ex:1: Enumerable.impl_for!/1
       (elixir 1.14.4) lib/enum.ex:166: Enumerable.reduce/3
       (elixir 1.14.4) lib/enum.ex:4307: Enum.reduce/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:523: anonymous fn/2 in EasySSL.parse_extensions/1
       (elixir 1.14.4) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
       (easy_ssl 1.3.0) lib/easy_ssl.ex:86: EasySSL.parse_der/2
       test/easy_ssl_test.exs:63: (test)


Finished in 0.08 seconds (0.00s async, 0.08s sync)
9 tests, 6 failures

[andrewtimberlake]

I believe it’s a problem with OTP 25, not Elixir 1.14
Previous versions of OTP automatically decoded certain extension points which OTP 25 apparently doesn’t
See voltone/x509#54