[rubygems/rubygems] Tests passing on truffleruby 22 in addition to 23

https://github.com/rubygems/rubygems/commit/8065530d43

lib/rubygems/safe_marshal/visitors/to_ruby.rb

@@ -89,7 +89,11 @@ module Gem::SafeMarshal
                 nano = Rational(nano_num, nano_den * 1_000_000_000)
                 object = Time.at(object.to_i + nano + object.subsec)
               elsif RUBY_ENGINE == "truffleruby"
-                object = Time.at(object.to_i, Rational(nano_num, nano_den).to_i, :nanosecond)
+                if RUBY_ENGINE_VERSION >= "23.0.0"
+                  object = Time.at(object.to_i, Rational(nano_num, nano_den).to_i, :nanosecond)
+                else
+                  object = object.floor + Rational(nano_num, nano_den * 1_000_000_000)
+                end
               else # assume "ruby"
                 nano = Rational(nano_num, nano_den)
                 nsec, subnano = nano.divmod(1)
@@ -106,12 +110,19 @@ module Gem::SafeMarshal
               object = object.localtime offset
             end
 
+            if RUBY_ENGINE == "truffleruby" && RUBY_ENGINE_VERSION < "23.0.0"
+              ivars << [:@offset, offset]
+              ivars << [:@zone, zone]
+              ivars << [:@nano_num, nano_num] if nano_num
+              ivars << [:@nano_den, nano_den] if nano_den
+            end
+
             @objects[object_offset] = object
           end
         when Elements::String
           enc = nil
 
-          ivars.each do |k, v|
+          ivars.reject! do |k, v|
             case k
             when :E
               case v
@@ -119,17 +130,19 @@ module Gem::SafeMarshal
                 enc = "UTF-8"
               when FalseClass
                 enc = "US-ASCII"
+              else
+              enc = v
               end
             else
-              break
+              next false
             end
-            idx += 1
+            true
           end
 
           object.replace ::String.new(object, encoding: enc)
         end
 
-        ivars[idx..].each do |k, v|
+        ivars.each do |k, v|
           object.instance_variable_set k, v
         end
         object

test/rubygems/test_gem_safe_marshal.rb

@@ -77,7 +77,10 @@ class TestGemSafeMarshal < Gem::TestCase
     Time.at(secs, 1.00001, :nanosecond),
   ].each_with_index do |t, i|
     define_method("test_time_#{i} #{t.inspect}") do
-      assert_safe_load_as t, additional_methods: [:ctime, :to_f, :to_r, :to_i, :zone, :subsec, :instance_variables, :dst?, :to_a]
+      pend "Marshal.load of Time with custom zone is broken before Truffleruby 23" if t.zone.nil? && RUBY_ENGINE == "truffleruby" && RUBY_ENGINE_VERSION < "23"
+
+      additional_methods = [:ctime, :to_f, :to_r, :to_i, :zone, :subsec, :instance_variables, :dst?, :to_a]
+      assert_safe_load_as t, additional_methods: additional_methods
     end
   end