ethon: NoMethodError: undefined method `enum' for Ethon::Curl:Module

[deepj]

It seems, in this case it looks on a problem with metaprogramming and extending modules.

To reproduce

require 'ethon'

Error:

NoMethodError: undefined method `enum' for Ethon::Curl:Module
	from ~/.gem/truffleruby/2.4.4/gems/ethon-0.11.0/lib/ethon/curls/constants.rb:16:in `Curl'
	from ~/.gem/truffleruby/2.4.4/gems/ethon-0.11.0/lib/ethon/curls/constants.rb:2:in `Ethon'
	from ~/.gem/truffleruby/2.4.4/gems/ethon-0.11.0/lib/ethon/curls/constants.rb:1:in `<top (required)>'
	from ~/.rubies/truffleruby-1.0.0-rc10/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:54:in `gem_original_require'
	from ~/.rubies/truffleruby-1.0.0-rc10/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from ~/.gem/truffleruby/2.4.4/gems/ethon-0.11.0/lib/ethon/curl.rb:26:in `Curl'
	from ~/.gem/truffleruby/2.4.4/gems/ethon-0.11.0/lib/ethon/curl.rb:13:in `Ethon'
	from ~/.gem/truffleruby/2.4.4/gems/ethon-0.11.0/lib/ethon/curl.rb:8:in `<top (required)>'
	from ~/.rubies/truffleruby-1.0.0-rc10/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:54:in `gem_original_require'
	from ~/.rubies/truffleruby-1.0.0-rc10/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from ~/.gem/truffleruby/2.4.4/gems/ethon-0.11.0/lib/ethon.rb:15:in `<top (required)>'
	from ~/.rubies/truffleruby-1.0.0-rc10/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:130:in `gem_original_require'
	from ~/.rubies/truffleruby-1.0.0-rc10/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:130:in `require'
	from (irb):3
	from ~/.rubies/truffleruby-1.0.0-rc10/bin/irb:29:in `<main>'

[Vad1mo]

I am facing a similar or same problem

Possibly unsupported Ruby implementation
/Users/v/.rvm/gems/truffleruby-1.0.0-rc10/gems/ethon-0.9.0/lib/ethon/curls/constants.rb:16:in `Curl': undefined method `enum' for Ethon::Curl:Module (NoMethodError)

Is there any workaround?

[deepj]

@Vad1mo I doubt there is one. It looks an issue in TruffleRuby interpreter. Maybe @eregon could know more and what he thinks about this.

[eregon]

I'm looking at improving our FFI implementation, which is currently fairly minimal and causing this, see #1529. I'll keep this issue open to make sure require "ethon" works.

[eregon]

I fixed this in 59fb511 and added complete support for the FFI, with a pure-Ruby implementation using Truffle NFI.
I checked and require "ethon" now works.
It will be in the next release (1.0.0-rc16).
Thank you for the report.