Not every class has a superclass? #4528
Description
It seems like sometimes ObjectSpace.each_object(Class).collect(&:superclass) may fail in JRuby but works fine in MRI.
Example of failure here: https://travis-ci.org/rubyworks/facets/jobs/209292853
undefined method `superclass' for #<Class:Java::OrgJrubyExtPsych>
lib/core/facets/class/subclasses.rb:20
18 list = []
19 ObjectSpace.each_object(Class) do |c|
=> 20 list.unshift c if c.superclass == self
21 end
22 list.uniq
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