Update ripper_supported? for truffleruby and ripper specs to rescue error

Author: bjfish

lib/rspec/support/ruby_features.rb

@@ -47,6 +47,10 @@ def non_mri?
       def mri?
         !defined?(RUBY_ENGINE) || RUBY_ENGINE == 'ruby'
       end
+
+      def truffleruby?
+        defined?(RUBY_ENGINE) && RUBY_ENGINE == 'truffleruby'
+      end
     end
 
     # @api private
@@ -101,7 +105,7 @@ def supports_taint?
       end
       ripper_requirements = [ComparableVersion.new(RUBY_VERSION) >= '1.9.2']
 
-      ripper_requirements.push(false) if Ruby.rbx?
+      ripper_requirements.push(false) if Ruby.rbx? || Ruby.truffleruby?
 
       if Ruby.jruby?
         ripper_requirements.push(Ruby.jruby_version >= '1.7.5')

spec/rspec/support/ruby_features_spec.rb

@@ -126,12 +126,16 @@ def ripper_works_correctly?
         # https://github.com/jruby/jruby/issues/3386
         def ripper_reports_correct_line_number?
           in_sub_process_if_possible do
-            require 'ripper'
-            tokens = ::Ripper.lex('foo')
-            token = tokens.first
-            location = token.first
-            line_number = location.first
-            line_number == 1
+            begin
+              require 'ripper'
+              tokens = ::Ripper.lex('foo')
+              token = tokens.first
+              location = token.first
+              line_number = location.first
+              line_number == 1
+            rescue NoMethodError
+              false # TruffleRuby defines Ripper but implementation is not complete
+            end
           end
         end