Enumerator#first when yielded arrays of 1 element bug. #2376
Description
From https://jira.codehaus.org/browse/JRUBY-7108
Enumerator.new{|y| y << [42]}.first # => 42, should be [42]{{ message }}
From https://jira.codehaus.org/browse/JRUBY-7108
Enumerator.new{|y| y << [42]}.first # => 42, should be [42]