It was not clear to me when we use the notation [...] whether those were proper lists or may be improper lists as well.

Filing this issue after mentioning it at https://elixirforum.com/t/string-at-edge-case/35961

It has to do with String.at when the string is nil and position is 0.

Environment

Ubuntu 20.10 Erlang/OTP 23 [erts-11.0.3] [source] [64-bit] [smp:6:6] [ds:6:6:10] [async-threads:1] Elixir 1.10.3 (compiled with Erlang/OTP 22)

Current behavior

String.at nil, 0
=> nil # Was expecting an error here, as in the next example:
String.at nil, 1
=> ** (FunctionClauseError) no function clause matching in String.Unicode.next_grapheme_size/1

I was surprised that nil was returned because all (most?) String functions will raise (some sort of) a FunctionClauseError when the input string is not a binary.

Expected behavior

I was expecting an error when passing nil as the first argument to String.at, no matter the position.

Oh wait, I think this is fixed in a newer version of Elixir. This MR seems to fix it: https://github.com/elixir-lang/elixir/pull/10506/files

Sorry for the noise... :disappointed_relieved:

Filing this issue after mentioning it at https://elixirforum.com/t/string-at-edge-case/35961

It has to do with String.at when the string is nil and position is 0.

Environment

Ubuntu 20.10 Erlang/OTP 23 [erts-11.0.3] [source] [64-bit] [smp:6:6] [ds:6:6:10] [async-threads:1] Elixir 1.10.3 (compiled with Erlang/OTP 22)

Current behavior

String.at nil, 0
=> nil # Was expecting an error here, as in the next example:
String.at nil, 1
=> ** (FunctionClauseError) no function clause matching in String.Unicode.next_grapheme_size/1

I was surprised that nil was returned because all (most?) String functions will raise (some sort of) a FunctionClauseError when the input string is not a binary.

Expected behavior

I was expecting an error when passing nil as the first argument to String.at, no matter the position.

Looks like that's a problem with Ubuntu Focal (20.04) libraries and Erlang dependencies. Ubuntu 18.04 supports both libssl1.0 and libssl1.1, but 20..04 only the second one. https://packages.ubuntu.com/search?suite=default&section=all&arch=any&keywords=libssl1.&searchon=names

Possibly related: actions/setup-elixir#31

Also please use Elixir Forum for asking questions.

Environment

• Elixir & Erlang/OTP versions (elixir --version): 1.11.2-otp-23
• Operating system: Ubuntu (github actions)

It looks like the 1.11.2 tag was updated today and our builds started breaking pulling the new tag

2020-12-03T17:41:51.3689562Z [command]/home/runner/work/_temp/.setup-elixir/elixir/bin/mix local.rebar --force
2020-12-03T17:41:51.7996023Z 
2020-12-03T17:41:51.7997868Z 17:41:51.792 [error] Unable to load crypto library. Failed with error:
2020-12-03T17:41:51.8001230Z ":load_failed, Failed to load NIF library /home/runner/work/_temp/.setup-elixir/otp/lib/crypto-4.8/priv/lib/crypto: 'libcrypto.so.1.0.0: cannot open shared object file: No such file or directory'"
2020-12-03T17:41:51.8003766Z OpenSSL might not be installed on this system.
2020-12-03T17:41:51.8004666Z 
2020-12-03T17:41:51.8040904Z 
2020-12-03T17:41:51.8042696Z 17:41:51.800 [warn]  The on_load function for module crypto returned:
2020-12-03T17:41:51.8044385Z {:error,
2020-12-03T17:41:51.8045445Z  {:load_failed,
2020-12-03T17:41:51.8048006Z   'Failed to load NIF library /home/runner/work/_temp/.setup-elixir/otp/lib/crypto-4.8/priv/lib/crypto: \'libcrypto.so.1.0.0: cannot open shared object file: No such file or directory\''}}
2020-12-03T17:41:51.8049747Z 
2020-12-03T17:41:51.8087458Z ** (Mix) httpc request failed with: {:failed_connect, [{:to_address, {'repo.hex.pm', 443}}, {:inet, [:inet], {:eoptions, {:undef, [{:crypto, :supports, [], []}, {:tls_record, :sufficient_support, 1, [file: 'tls_record.erl', line: 743]}, {:tls_record, :supported_protocol_versions, 1, [file: 'tls_record.erl', line: 370]}, {:tls_record, :supported_protocol_versions, 0, [file: 'tls_record.erl', line: 358]}, {:ssl, :handle_option, 4, [file: 'ssl.erl', line: 1920]}, {:ssl, :process_options, 3, [file: 'ssl.erl', line: 1644]}, {:ssl, :handle_options, 3, [file: 'ssl.erl', line: 1598]}, {:ssl, :connect, 4, [file: 'ssl.erl', line: 600]}]}}}]}
2020-12-03T17:41:51.8090752Z 
2020-12-03T17:41:51.8093250Z Could not install Rebar because Mix could not download metadata at https://repo.hex.pm/installs/rebar-1.x.csv.
2020-12-03T17:41:51.8094483Z 
2020-12-03T17:41:51.8128343Z ##[error]The process '/home/runner/work/_temp/.setup-elixir/elixir/bin/mix' failed with exit code 1

Hi @michaelst, this is not an Elixir issue. There is either something wrong or corrupted in your Erlang installation/checkout. You can try doing running crypto:version() and crypto:supports() in an Erlang shell and it will most likely fail too, so I recommend investigating there. :)

Environment

• Elixir & Erlang/OTP versions (elixir --version): 1.11.2-otp-23
• Operating system: Ubuntu (github actions)

It looks like the 1.11.2 tag was updated today and our builds started breaking pulling the new tag

2020-12-03T17:41:51.3689562Z [command]/home/runner/work/_temp/.setup-elixir/elixir/bin/mix local.rebar --force
2020-12-03T17:41:51.7996023Z 
2020-12-03T17:41:51.7997868Z 17:41:51.792 [error] Unable to load crypto library. Failed with error:
2020-12-03T17:41:51.8001230Z ":load_failed, Failed to load NIF library /home/runner/work/_temp/.setup-elixir/otp/lib/crypto-4.8/priv/lib/crypto: 'libcrypto.so.1.0.0: cannot open shared object file: No such file or directory'"
2020-12-03T17:41:51.8003766Z OpenSSL might not be installed on this system.
2020-12-03T17:41:51.8004666Z 
2020-12-03T17:41:51.8040904Z 
2020-12-03T17:41:51.8042696Z 17:41:51.800 [warn]  The on_load function for module crypto returned:
2020-12-03T17:41:51.8044385Z {:error,
2020-12-03T17:41:51.8045445Z  {:load_failed,
2020-12-03T17:41:51.8048006Z   'Failed to load NIF library /home/runner/work/_temp/.setup-elixir/otp/lib/crypto-4.8/priv/lib/crypto: \'libcrypto.so.1.0.0: cannot open shared object file: No such file or directory\''}}
2020-12-03T17:41:51.8049747Z 
2020-12-03T17:41:51.8087458Z ** (Mix) httpc request failed with: {:failed_connect, [{:to_address, {'repo.hex.pm', 443}}, {:inet, [:inet], {:eoptions, {:undef, [{:crypto, :supports, [], []}, {:tls_record, :sufficient_support, 1, [file: 'tls_record.erl', line: 743]}, {:tls_record, :supported_protocol_versions, 1, [file: 'tls_record.erl', line: 370]}, {:tls_record, :supported_protocol_versions, 0, [file: 'tls_record.erl', line: 358]}, {:ssl, :handle_option, 4, [file: 'ssl.erl', line: 1920]}, {:ssl, :process_options, 3, [file: 'ssl.erl', line: 1644]}, {:ssl, :handle_options, 3, [file: 'ssl.erl', line: 1598]}, {:ssl, :connect, 4, [file: 'ssl.erl', line: 600]}]}}}]}
2020-12-03T17:41:51.8090752Z 
2020-12-03T17:41:51.8093250Z Could not install Rebar because Mix could not download metadata at https://repo.hex.pm/installs/rebar-1.x.csv.
2020-12-03T17:41:51.8094483Z 
2020-12-03T17:41:51.8128343Z ##[error]The process '/home/runner/work/_temp/.setup-elixir/elixir/bin/mix' failed with exit code 1

I have decided to add an algorithm for finding the parity of a number because I feel like such an algorithm should be added to this repository.

This is a terrible practice. To determine parity, use x % 2 for everyday code or x & 1 if you really wanna go low-level uber-performance. Also your definition of parity for fractions is ridiculous. Where did you find it?

Oh ok

• Changes 'a lower' (bound) to 'an upper' (bound) to reflect presumed meaning.

:green_heart: :blue_heart: :purple_heart: :yellow_heart: :heart:

  """
  @doc since: "1.12.0"
  @spec pow(integer, pos_integer) :: integer
  def pow(base, exponent) when is_integer(base) and is_integer(exponent) and exponent >= 0 do

  """
  @doc since: "1.12.0"
  @spec pow(float, number) :: float
  def pow(base, exponent) when is_float(base) and is_number(exponent),

  are given, it raises `ArithmeticError`.

Do we use "argument error" to refer all argument errors? Or only ArgumentError? I found it is captured as ArithmeticError in Elixir 1.1.2 / OTP 23.1.2

defmodule Foo do
  def pow(base, exponent) when is_float(base) and is_number(exponent),
    do: :math.pow(base, exponent)
end

Foo.pow(-1.0, 1.1)
** (ArithmeticError) bad argument in arithmetic expression
    (stdlib 3.13.2) :math.pow(-1.0, 1.1)
    iex:3: Foo.pow/2

This should be fixed on Erlang 22.3.4.1 released today. A fix for 23.0 is coming out soon. Thanks everyone for helping!

We switched to Erlang 22.3.4.1. We still observe Erlang compiler hangs about 5-10% of our runs in CI - we have almost 800K of Erlang in our project spread over 8 files. (ASN.1 codecs generated by asn1ct.) It seems that the compiler hangs until the job is killed about 40 minutes later.

Codecov Report

Merging #584 (fc731b9) into master (2c74ced) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #584   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          150       150           
  Lines         2627      2627           
  Branches       437       437           
=========================================
  Hits          2627      2627           

Continue to review full report at Codecov.

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