Why doesn't 'haml --check' find this glaring syntax error

Question

I was looking for rake tasks that would help me track down syntax errors, and I came across haml --check as a possible solution for double checking haml files. Unfortunately, when I passed it this broken example, haml says the syntax is OK.

Have I misunderstood the purpose of haml --check or is this feature not fully implemented?

I suppose I should mention I'm using Haml/Sass 3.0.25 (Classy Cassidy), rails 3.0.3, ruby 1.9.2p0, and Mac 10.6.6.

$ haml --check /tmp/edit.html.haml
Syntax OK

#/tmp/edit.html.haml
- content_for :head do
  = include_javascripts :aspects

#aspect_edit_pane
  #facebox_header
    %h4
      = @aspect
      .description
        = t('contacts', :count =>@aspect_contacts.count)}

The last character (curly brace) should trigger a syntax error, it certainly does when the template is executed as part of a request:

ActionView::Template::Error (compile error 
    /usr/local/app/diaspora/app/views/aspects/edit.html.haml:13: 
    syntax error, unexpected '}', expecting ')'

Answer 1

Maybe because -c, --check Just check syntax, don't evaluate.

Guess: it checks just the haml syntax and doesn't evaluate inline ruby.

--edit

This probably needs some more testing but I got it working on simple haml files :)

haml --debug newsletter.html.haml 2> /dev/null | sed '$d' | ruby -c

In theory:

Haml prints out the precompiled Ruby source (and error messages in the end), we try to get just the ruby part and check the syntax.