sassc-rails not working with jruby 9k

[gkosmr]

I tried to precompile assets with jruby9 and got the error below.
It works fine with version 1.2.1 of sassc-rails. As the stacktrace indicates the problem is in template.rb when calling safe_merge (which was introduced in version 1.3.0) in a block passed to Hash#merge.

It works fine with ruby (tested with 2.3.0 and 2.4.1).

Using hsh1.merge(hsh2) { |*args| fn(*args) } does not work in jruby, while it does in ruby. On the other hand hsh1.merge(hsh2){ |args| fn(*args) } works in jruby but not in ruby.

Since we know exactly what is passed to block in merge function, i suggest calls to safe_merge are changed to: hsh1.merge(hsh2){ |key, left, right| sage_merge(key, left, right) }.

I can prepare the pull request, if you agree with the change.

Stacktrace:

rake aborted!
ArgumentError: wrong number of arguments (1 for 3)
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sassc-rails-1.3.0/lib/sassc/rails/template.rb:29:in safe_merge' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sassc-rails-1.3.0/lib/sassc/rails/template.rb:29:in block in call'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sassc-rails-1.3.0/lib/sassc/rails/template.rb:18:in call' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/sass_processor.rb:30:in call'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in call_processor' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in block in call_processors'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in call_processors' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in load_from_unloaded'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in block in load' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in fetch_asset_from_dependency_cache'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in load' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in block in initialize'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in load' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:23:in block in call'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:200:in dfs' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:24:in call'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in call_processor' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in block in call_processors'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in call_processors' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in load_from_unloaded'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in block in load' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in fetch_asset_from_dependency_cache'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in load' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in block in initialize'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in load' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:66:in find_asset'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:73:in find_all_linked_assets' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:134:in block in find'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:133:in find' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:185:in compile'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:68:in block in define' /home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-3.7.1/lib/rake/sprocketstask.rb:147:in with_logger'
/home/gasper/.rvm/gems/jruby-9.0.5.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:67:in block in define' /home/gasper/.rvm/gems/jruby-9.0.5.0@global/gems/rake-12.0.0/exe/rake:27:in '
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

[glebm]

This is likely caused by jruby/jruby#4108 or one of the related issues, and unlikely to be fixed soon on the JRuby side.

I agree that this should be worked around here.