Test is failed with Ruby 2.5+

[pocke]

massign structure has been changed.

$ bundle exec rspec

(snip)

Finished in 0.0096 seconds
47 examples, 11 failures

Failed examples:

rspec ./spec/ruby-hl-lvar_spec.rb:26 # RubyHlLvar::Extractor#extract with simple mass assignment should == [["a", 1, 0], ["b", 1, 3], ["c", 1, 6]]
rspec ./spec/ruby-hl-lvar_spec.rb:32 # RubyHlLvar::Extractor#extract complex mass assignment should == [["a", 1, 0], ["b", 1, 4], ["c", 1, 7]]
rspec ./spec/ruby-hl-lvar_spec.rb:33 # RubyHlLvar::Extractor#extract complex mass assignment should == [["a", 1, 0], ["b", 1, 4]]
rspec ./spec/ruby-hl-lvar_spec.rb:34 # RubyHlLvar::Extractor#extract complex mass assignment should == [["a", 1, 1], ["b", 1, 4]]
rspec ./spec/ruby-hl-lvar_spec.rb:35 # RubyHlLvar::Extractor#extract complex mass assignment should == [["a", 1, 0], ["b", 1, 4], ["c", 1, 7]]
rspec ./spec/ruby-hl-lvar_spec.rb:41 # RubyHlLvar::Extractor#extract lhs of assignment should == [["a", 1, 0], ["a", 2, 1], ["b", 2, 4], ["a", 2, 9]]
rspec ./spec/ruby-hl-lvar_spec.rb:45 # RubyHlLvar::Extractor#extract with complex mass assignment should == [["a", 1, 1], ["b", 1, 5], ["c", 1, 8], ["d", 1, 13]]
rspec ./spec/ruby-hl-lvar_spec.rb:61 # RubyHlLvar::Extractor#extract complex block args should == [["a", 1, 7], ["b", 1, 10], ["c", 1, 12]]
rspec ./spec/ruby-hl-lvar_spec.rb:67 # RubyHlLvar::Extractor#extract array should == [["a", 1, 0], ["b", 1, 2], ["a", 2, 1], ["b", 2, 3]]
rspec ./spec/ruby-hl-lvar_spec.rb:126 # RubyHlLvar::Extractor#extract field mass assignment should == [["z", 1, 5]]
rspec ./spec/ruby-hl-lvar_spec.rb:144 # RubyHlLvar::Extractor#extract for params should == [["x", 1, 5], ["y", 1, 9], ["z", 1, 12]]

$ docker run -it --rm rubylang/all-ruby env ALL_RUBY_SINCE=ruby-2.4 ./all-ruby -rpp -rripper -e 'pp Ripper.sexp("a,b=1,2")'
ruby-2.4.0          [:program,
                     [[:massign,
                       [[:@ident, "a", [1, 0]], [:@ident, "b", [1, 2]]],
                       [:mrhs_new_from_args, [[:@int, "1", [1, 4]]], [:@int, "2", [1, 6]]]]]]
...
ruby-2.4.9          [:program,
                     [[:massign,
                       [[:@ident, "a", [1, 0]], [:@ident, "b", [1, 2]]],
                       [:mrhs_new_from_args, [[:@int, "1", [1, 4]]], [:@int, "2", [1, 6]]]]]]
ruby-2.5.0-preview1 [:program,
                     [[:massign,
                       [[:var_field, [:@ident, "a", [1, 0]]],
                        [:var_field, [:@ident, "b", [1, 2]]]],
                       [:mrhs_new_from_args, [[:@int, "1", [1, 4]]], [:@int, "2", [1, 6]]]]]]
...
ruby-2.7.0-preview1 [:program,
                     [[:massign,
                       [[:var_field, [:@ident, "a", [1, 0]]],
                        [:var_field, [:@ident, "b", [1, 2]]]],
                       [:mrhs_new_from_args, [[:@int, "1", [1, 4]]], [:@int, "2", [1, 6]]]]]]

[chiastolite]

I resolved this issue by #23.