Nil tag with implicit: false raises error on SnakeYAML
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调研方向
从 lib/psych/visitors/yaml_tree.rb 大约第 520 行开始，跟踪 nil 标签和隐式值进入 emitter 的过程，包括 org/jruby/ext/psych/PsychEmitter.java。复现 #475 中的测试或 JRuby PR #6680 中剩余的失败，然后验证转储受影响的 mapping 不再触发 SnakeYAML 的标签错误。
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描述
The following line, when reached by the tests from #475, triggers SnakeYAML to raise an error:
The error:
RuntimeError: org.yaml.snakeyaml.emitter.EmitterException: tag is not specified
scalar at org/jruby/ext/psych/PsychEmitter.java:206
visit_Psych_Nodes_Scalar at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:32
visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
visit_Psych_Nodes_Mapping at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:43
each at org/jruby/RubyArray.java:1864
visit_Psych_Nodes_Mapping at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:43
visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
visit_Psych_Nodes_Document at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:27
each at org/jruby/RubyArray.java:1864
visit_Psych_Nodes_Document at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:27
visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
visit_Psych_Nodes_Stream at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:21
each at org/jruby/RubyArray.java:1864
visit_Psych_Nodes_Stream at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:21
visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
yaml at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/nodes/node.rb:61
dump at /Users/headius/projects/jruby/lib/ruby/stdlib/psych.rb:515
<main> at blah.rb:13
As far as I can tell, the issue is that the tag is nil and implicit is false, which is prohibited in SnakeYAML for a mapping.
This is somewhat outside my understanding of YAML and I am not sure whether this constitutes an improper behavioral difference in SnakeYAML or not.
The implicit value comes from the default @implicit of Coder, and is never set to true in the logic hit by the tests mentioned above. As it stands I do not know how to reconcile the values being passed in with the SnakeYAML hard error.
This leads to the remaining failures in https://github.com/jruby/jruby/pull/6680, which I will exclude to proceed with the Psych update.
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