For Slim issue

app.rb

require 'sinatra'
require 'slim'
require 'slim/include'
set :bind, '0.0.0.0'
get '/' do
  slim :index
end

index.slim

doctype html
html
  head
    title Slim Examples
    javascript:
      alert('Slim supports embedded javascript!')

  body
    h1 Markup examples

    #content
      p This example shows you how a basic Slim file looks.

stacktrace.txt

2018-08-31 00:35:43 - ArgumentError - wrong number of arguments (given 3, expected 2):
        /var/lib/gems/2.5.0/gems/slim-4.0.0/lib/slim/filter.rb:16:in `on_slim_embedded'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:89:in `dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:49:in `compile'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `block in on_multi'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `each'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `on_multi'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:110:in `dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:49:in `compile'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/html/dispatcher.rb:27:in `on_html_tag'
        /var/lib/gems/2.5.0/gems/slim-4.0.0/lib/slim/include.rb:13:in `on_html_tag'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:70:in `dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:49:in `compile'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `block in on_multi'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `each'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `on_multi'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:110:in `dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:49:in `compile'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/html/dispatcher.rb:27:in `on_html_tag'
        /var/lib/gems/2.5.0/gems/slim-4.0.0/lib/slim/include.rb:13:in `on_html_tag'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:70:in `dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:49:in `compile'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `block in on_multi'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `each'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:7:in `on_multi'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:110:in `dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:69:in `replace_dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:55:in `dispatcher'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:49:in `compile'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/dispatcher.rb:45:in `call'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/engine.rb:50:in `block in call'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/engine.rb:50:in `each'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/engine.rb:50:in `inject'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/engine.rb:50:in `call'
        /var/lib/gems/2.5.0/gems/slim-4.0.0/lib/slim/include.rb:52:in `block in call'
        /var/lib/gems/2.5.0/gems/slim-4.0.0/lib/slim/include.rb:52:in `catch'
        /var/lib/gems/2.5.0/gems/slim-4.0.0/lib/slim/include.rb:52:in `call'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/mixins/template.rb:10:in `compile'
        /var/lib/gems/2.5.0/gems/temple-0.8.0/lib/temple/templates/tilt.rb:30:in `prepare'
        /var/lib/gems/2.5.0/gems/tilt-2.0.8/lib/tilt/template.rb:99:in `initialize'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:878:in `new'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:878:in `block in compile_template'
        /var/lib/gems/2.5.0/gems/tilt-2.0.8/lib/tilt.rb:104:in `block in fetch'
        /var/lib/gems/2.5.0/gems/tilt-2.0.8/lib/tilt.rb:103:in `fetch'
        /var/lib/gems/2.5.0/gems/tilt-2.0.8/lib/tilt.rb:103:in `fetch'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:857:in `compile_template'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:838:in `render'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:759:in `slim'
        app.rb:6:in `block in <main>'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1635:in `call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1635:in `block in compile!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:992:in `block (3 levels) in route!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1011:in `route_eval'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:992:in `block (2 levels) in route!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1040:in `block in process_route'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1038:in `catch'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1038:in `process_route'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:990:in `block in route!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:989:in `each'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:989:in `route!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1097:in `block in dispatch!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1076:in `block in invoke'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1076:in `catch'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1076:in `invoke'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1094:in `dispatch!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:924:in `block in call!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1076:in `block in invoke'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1076:in `catch'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1076:in `invoke'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:924:in `call!'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:913:in `call'
        /var/lib/gems/2.5.0/gems/rack-protection-2.0.3/lib/rack/protection/xss_header.rb:18:in `call'
        /var/lib/gems/2.5.0/gems/rack-protection-2.0.3/lib/rack/protection/path_traversal.rb:16:in `call'
        /var/lib/gems/2.5.0/gems/rack-protection-2.0.3/lib/rack/protection/json_csrf.rb:26:in `call'
        /var/lib/gems/2.5.0/gems/rack-protection-2.0.3/lib/rack/protection/base.rb:50:in `call'
        /var/lib/gems/2.5.0/gems/rack-protection-2.0.3/lib/rack/protection/base.rb:50:in `call'
        /var/lib/gems/2.5.0/gems/rack-protection-2.0.3/lib/rack/protection/frame_options.rb:31:in `call'
        /var/lib/gems/2.5.0/gems/rack-2.0.5/lib/rack/logger.rb:15:in `call'
        /var/lib/gems/2.5.0/gems/rack-2.0.5/lib/rack/common_logger.rb:33:in `call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:231:in `call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:224:in `call'
        /var/lib/gems/2.5.0/gems/rack-2.0.5/lib/rack/head.rb:12:in `call'
        /var/lib/gems/2.5.0/gems/rack-2.0.5/lib/rack/method_override.rb:22:in `call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/show_exceptions.rb:22:in `call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:194:in `call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1958:in `call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1502:in `block in call'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1729:in `synchronize'
        /var/lib/gems/2.5.0/gems/sinatra-2.0.3/lib/sinatra/base.rb:1502:in `call'
        /var/lib/gems/2.5.0/gems/rack-2.0.5/lib/rack/handler/webrick.rb:86:in `service'
        /usr/lib/ruby/2.5.0/webrick/httpserver.rb:140:in `service'
        /usr/lib/ruby/2.5.0/webrick/httpserver.rb:96:in `run'
        /usr/lib/ruby/2.5.0/webrick/server.rb:307:in `block in start_thread'

For slim-template/slim#819

@betrue12 thanks for reporting. The issue is with require 'slim/include', which you aren't leveraging in the example. Remove that require statement and your code works. https://travis-ci.org/slim-template/slim/builds/423050843

However, there is an issue with require 'slim/include' I need to address. I will write another test and corresponding fix.

Side note: I've copied the Sinatra Slim tests into this repo to remove the external dependency and start adding specific use cases like this one.

@stonean Sorry for confusing, too simple example code. Actually, I found this error in my another Sinatra app using include.

I see your commit fixing it, Thank you for the quickest work!