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In Ruby < 3.0, the superclass of StringIO was actually already `Data`,
but it doesn't have the expected shape. So, on these earlier versions it errors:
> NoMethodError: undefined method `members' for #<StringIO:0x00005641dd5f2880>
> vendor/bundle/ruby/2.6.0/gems/psych-5.2.5/lib/psych/visitors/yaml_tree.rb:170:in `visit_Data'
This test doesn't fail on 2.7, presumably because it can pull in a newer `stringio` version.
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|---|---|---|
| .. | ||
| handlers | ||
| json | ||
| nodes | ||
| visitors | ||
| helper.rb | ||
| test_alias_and_anchor.rb | ||
| test_array.rb | ||
| test_boolean.rb | ||
| test_class.rb | ||
| test_coder.rb | ||
| test_data.rb | ||
| test_date_time.rb | ||
| test_deprecated.rb | ||
| test_document.rb | ||
| test_emitter.rb | ||
| test_encoding.rb | ||
| test_exception.rb | ||
| test_hash.rb | ||
| test_json_tree.rb | ||
| test_marshalable.rb | ||
| test_merge_keys.rb | ||
| test_nil.rb | ||
| test_null.rb | ||
| test_numeric.rb | ||
| test_object.rb | ||
| test_object_references.rb | ||
| test_omap.rb | ||
| test_parser.rb | ||
| test_psych.rb | ||
| test_psych_set.rb | ||
| test_ractor.rb | ||
| test_safe_load.rb | ||
| test_scalar.rb | ||
| test_scalar_scanner.rb | ||
| test_serialize_subclasses.rb | ||
| test_set.rb | ||
| test_stream.rb | ||
| test_string.rb | ||
| test_stringio.rb | ||
| test_struct.rb | ||
| test_symbol.rb | ||
| test_tree_builder.rb | ||
| test_yaml.rb | ||
| test_yaml_special_cases.rb | ||
| test_yamldbm.rb | ||
| test_yamlstore.rb | ||