Erubi superclass mismatch with Haml

[dguettler]

Error description

Attempting to run a Rails application with version 2.3.0 results in the following error

.bundle/ruby/2.4.0/gems/haml-5.0.1/lib/haml/helpers/safe_erubi_template.rb:5: warning: toplevel constant Erubi referenced by ActionView::Template::Handlers::ERB::Erubi
rails aborted!
TypeError: superclass must be a Class (Module given)
.bundle/ruby/2.4.0/gems/haml-5.0.1/lib/haml/helpers/safe_erubi_template.rb:5:in `<module:Haml>'
.bundle/ruby/2.4.0/gems/haml-5.0.1/lib/haml/helpers/safe_erubi_template.rb:4:in `<top (required)>'
.bundle/ruby/2.4.0/gems/activesupport-5.0.5/lib/active_support/dependencies.rb:293:in `require'
.bundle/ruby/2.4.0/gems/activesupport-5.0.5/lib/active_support/dependencies.rb:293:in `block in require'

Possible other conflicting dependencies

• Haml

Affected version

• 2.3.0

Not affected version

• 2.2.0

[dguettler]

Cross-linking haml/haml#946

[RobinDaugherty]

@dguettler can you test adding Erubis directly to your Gemfile? It seems like it might be caused by the complete removed of Erubis.

[tmnsun]

@RobinDaugherty adding Erubis to Gemfile solves the issue.

[RobinDaugherty]

This is an bug in haml caused when erubi is in the bundle along with Rails prior to 5.1. I've submitted haml/haml#948 to fix this. Can you try using my fork of haml in your project and report your results in that pull request?

gem 'haml', github: 'RobinDaugherty/haml', branch: 'patch-1'

[dguettler]

@RobinDaugherty adding Erubis did not solve the issue for me.
Your patch-1 branch works fine though. Thanks again for digging into this.

[907th]

@dguettler patch-1 merged and deleted but bug is still here. Waiting for haml/haml#952

[RobinDaugherty]

haml version 5.0.2 includes a fix for Erubi with older versions of Rails.