gistfile1.txt

~/D/g/a/all-ruby (master) > all-ruby -e "p [].respond_to? :flat_map"
ruby-0.49             -e:1: syntax error
                  #<Process::Status: pid 8 exit 1>
...
ruby-0.95             -e:1: syntax error
                  #<Process::Status: pid 20 exit 1>
ruby-0.99.4-961224    FALSE
...
ruby-1.1a7            FALSE
ruby-1.1a8            false
...
ruby-1.6.8            false
ruby-1.8.0            -e:1: warning: parenthesize argument(s) for future version
                      false
...
ruby-1.8.6-p420       -e:1: warning: parenthesize argument(s) for future version
                      false
ruby-1.8.7-preview1   false
...
ruby-1.9.2-preview1   false
ruby-1.9.2-preview3   true
...
ruby-2.6.0-preview2   true