[DRE-maint] Bug#747714: FTBFS: uninitialized constant Capistrano::Configuration::AliasTask

[Christian Hofstaedtler]

Source: capistrano
Version: 2.12.0-2
Severity: serious
Justification: fails to build from source
User: debian-ruby at lists.debian.org
Usertags: ruby2.0-rm

Dear Maintainer,

During a rebuild of ruby-related packages your package failed to
build with these errors:

Running tests for ruby2.1 using debian/ruby-tests.rb...
/«PKGBUILDDIR»/debian/capistrano/usr/lib/ruby/vendor_ruby/capistrano/configuration/namespaces.rb:199:in `<class:Namespace>': uninitialized constant Capistrano::Configuration::AliasTask (NameError)
        from /«PKGBUILDDIR»/debian/capistrano/usr/lib/ruby/vendor_ruby/capistrano/configuration/namespaces.rb:175:in `<module:Namespaces>'
        from /«PKGBUILDDIR»/debian/capistrano/usr/lib/ruby/vendor_ruby/capistrano/configuration/namespaces.rb:5:in `<class:Configuration>'
        from /«PKGBUILDDIR»/debian/capistrano/usr/lib/ruby/vendor_ruby/capistrano/configuration/namespaces.rb:4:in `<module:Capistrano>'
        from /«PKGBUILDDIR»/debian/capistrano/usr/lib/ruby/vendor_ruby/capistrano/configuration/namespaces.rb:3:in `<top (required)>'
        from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /«PKGBUILDDIR»/test/configuration/namespace_dsl_test.rb:2:in `<top (required)>'
[..]
dh_auto_install: dh_ruby --install /«PKGBUILDDIR»/debian/capistrano returned exit code 1
make: *** [binary] Error 1


Please note that the default ruby has been switched to 2.1 in sid.
If possible, please switch to the metapackages and `dh_ruby
--print-supported` for detecting the ruby to build for.
(Also, if everything goes according to plan, this is the last ruby
transition for jessie.)

Please find the full build log attached.

Thanks,
  -ch
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