Problem with ::toc[] and custom HTML template

test.adoc

= Test
:toc: macro

abc

toc::[]

abc

Command

asciidoctor --trace -T asciidoctor-backends/erb/html5 test.adoc

or

asciidoctor --trace -T asciidoctor-backends/haml/html5 test.adoc

or

asciidoctor --trace -T asciidoctor-backends/slim/html5 test.adoc

Result (asciidoctor --trace -T asciidoctor-backends/erb/html5 test.adoc)

Traceback (most recent call last):
        27: from /usr/local/bin/asciidoctor:23:in `<main>'
        26: from /usr/local/bin/asciidoctor:23:in `load'
        25: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/bin/asciidoctor:15:in `<top (required)>'
        24: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/cli/invoker.rb:111:in `invoke!'
        23: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/cli/invoker.rb:111:in `each'
        22: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/cli/invoker.rb:128:in `block in invoke!'
        21: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/convert.rb:183:in `convert_file'
        20: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/convert.rb:183:in `open'
        19: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/convert.rb:183:in `block in convert_file'
        18: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/convert.rb:118:in `convert'
        17: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/document.rb:951:in `convert'
        16: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/converter/composite.rb:28:in `convert'
        15: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/converter/template.rb:107:in `convert'
        14: from /var/lib/gems/2.5.0/gems/tilt-2.0.10/lib/tilt/template.rb:109:in `render'
        13: from /var/lib/gems/2.5.0/gems/tilt-2.0.10/lib/tilt/template.rb:170:in `evaluate'
        12: from /var/lib/gems/2.5.0/gems/tilt-2.0.10/lib/tilt/template.rb:170:in `call'
        11: from asciidoctor-backends/erb/html5/document.html.erb:144:in `__tilt_46916425557440'
        10: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/document.rb:1020:in `content'
         9: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/abstract_block.rb:84:in `content'
         8: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/abstract_block.rb:84:in `map'
         7: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/abstract_block.rb:84:in `block in content'
         6: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/abstract_block.rb:75:in `convert'
         5: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/converter/composite.rb:28:in `convert'
         4: from /var/lib/gems/2.5.0/gems/asciidoctor-2.0.10/lib/asciidoctor/converter/template.rb:109:in `convert'
         3: from /var/lib/gems/2.5.0/gems/tilt-2.0.10/lib/tilt/template.rb:109:in `render'
         2: from /var/lib/gems/2.5.0/gems/tilt-2.0.10/lib/tilt/template.rb:170:in `evaluate'
         1: from /var/lib/gems/2.5.0/gems/tilt-2.0.10/lib/tilt/template.rb:170:in `call'
/asciidoctor-backends/erb/html5/block_toc.html.erb:16:in `__tilt_46916425557440': undefined method `convert_with_options' for #<Asciidoctor::Converter::CompositeConverter:0x000055572a698968> (NoMethodError)

Additional information

I've just downloaded the directory

asciidoctor-backends

from GitHub without modifying anything.

I am sorry to say, as per this comment https://github.com/asciidoctor/asciidoctor-backends/issues/124#issuecomment-305276934 `asciidoctor-backends` is for reference and example, and it seems contains some inconsitencies with last Asciidoctor version.

The error you see "undefined method `convert_with_options'" is because the method no longer exists in the Asciidoctor::Converter, you can use `convert` instead https://github.com/asciidoctor/asciidoctor/blob/88bc891d6a0143f3a2142f41d29cabe3cb21fe3f/lib/asciidoctor/converter.rb#L71.
After fixing this, I had to apply another change in "block_outline.html.slim" to change usage of `DEFAULT_TOCLEVELS` also.

Any chance there's an example of this working? E.g. are the template files for docs.asciidoctor.org publicly viewable, or are there sites with their templates publicly viewable?

Of course after I posted I found an example (I think?)

converter.convert @document, 'outline'

There's this repo with examples https://github.com/asciidoctor/asciidoctor-backends, but it's for example, not an official reference.

Also, if you struggle and have more questions, the best is to address in https://asciidoctor.zulipchat.com/, there's more activity there.