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This example app demonstrates a crash in sprockets + sassc when precompiling assets.

The ingredients to trigger the crash are:

• sprockets 4.0
• administrate 0.15.0 or 0.16.0
• bootstrap-sass

Given these dependencies, adding a scss file (in this repo, base.scss) with the following lines makes running bundle exec rake assets:precompile segfault:

@import "bootstrap-sprockets";
@import "bootstrap";

As suggested in sass/sassc-ruby#207, adding the following to config.application.rb makes the problem go away:

config.assets.configure do |env|
  env.export_concurrent = false
end

Related bug report: rails/sprockets#706