# YAML Test Matrix

--- &test-C2SP
  Title: Flow Mapping Key on two lines
  Tags: [ error, flow, mapping ]

YAML

[23
]: 42

Expected Events

+STR
+DOC
+SEQ []
=VAL :23

Expected JSON



hs-reference-yeast

 invalid_incorrect
Line  Col Char Byte Token|Content
   1    0    0    0 +DOC |
   1    0    0    0 +NODE|
   1    0    0    0 +SEQ |
   1    0    0    0 =SYNX|[
   1    1    1    1 +NODE|
   1    1    1    1 +VAL |
   1    1    1    1 =TEXT|23
   1    3    3    3 -VAL |
   1    3    3    3 -NODE|
   1    3    3    3 =EOL |\x0a
   2    0    4    4 =SYNX|]
   2    1    5    5 -SEQ |
   2    1    5    5 -NODE|
   2    1    5    5 =ERR |Expected.start.of.line
   2    1    5    5 =REST|:.42
   2    5    9    9 =REST|\x0a
   3    0   10   10 -DOC |

c-libfyaml-event

 invalid_correct
stdin:2:2: error: invalid mapping in plain multiline
]: 42
 ^
+STR
+DOC
+SEQ []
=VAL :23
-SEQ
-DOC

c-libfyaml-json

 invalid_correct
stdin:2:2: error: invalid mapping in plain multiline
]: 42
 ^
[
  23
]

c-libyaml-event

 invalid_correct
Parse error: mapping values are not allowed in this context
+STR
+DOC
+SEQ []
=VAL :23
-SEQ

cpp-rapidyaml-event

 invalid_correct
/tmp/rapidyaml-0.4.0-src/src/c4/yml/parse.cpp:3309:check failed: !m_tree->has_children(parent_id)
Aborted (core dumped)

cpp-yamlcpp-event

 invalid_correct
Exception:
yaml-cpp: error at line 2, column 2: illegal map value
+STR

dotnet-yamldotnet-event

 invalid_correct
Unhandled exception. YamlDotNet.Core.SemanticErrorException: (Line: 2, Col: 1, Idx: 4) - (Line: 2, Col: 1, Idx: 4): While parsing a flow sequence, did not find expected ',' or ']'.
   at YamlDotNet.Core.Parser.ParseFlowSequenceEntry(Boolean isFirst)
   at YamlDotNet.Core.Parser.StateMachine()
   at YamlDotNet.Core.Parser.MoveNext()
   at YamlDotNet.RepresentationModel.LibYamlEventStream.WriteTo(TextWriter textWriter)
   at Program.Main(String[] commandLineArguments)
Aborted (core dumped)
+STR
+DOC
+SEQ
=VAL :23

dotnet-yamldotnet-json

 invalid_correct
Unhandled exception. YamlDotNet.Core.SemanticErrorException: (Line: 2, Col: 1, Idx: 4) - (Line: 2, Col: 1, Idx: 4): While parsing a flow sequence, did not find expected ',' or ']'.
   at YamlDotNet.Core.Parser.ParseFlowSequenceEntry(Boolean isFirst)
   at YamlDotNet.Core.Parser.StateMachine()
   at YamlDotNet.Core.Parser.MoveNext()
   at YamlDotNet.Core.ParserExtensions.TryConsume[T](IParser parser, T& event)
   at YamlDotNet.Serialization.NodeDeserializers.ScalarNodeDeserializer.YamlDotNet.Serialization.INodeDeserializer.Deserialize(IParser parser, Type expectedType, Func`3 nestedObjectDeserializer, Object& value)
   at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
   at YamlDotNet.Serialization.ValueDeserializers.AliasValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
   at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.<>c__DisplayClass3_0.<DeserializeValue>b__0(IParser r, Type t)
   at YamlDotNet.Serialization.NodeDeserializers.CollectionNodeDeserializer.DeserializeHelper(Type tItem, IParser parser, Func`3 nestedObjectDeserializer, IList result, Boolean canUpdate)
   at YamlDotNet.Serialization.NodeDeserializers.CollectionNodeDeserializer.YamlDotNet.Serialization.INodeDeserializer.Deserialize(IParser parser, Type expectedType, Func`3 nestedObjectDeserializer, Object& value)
   at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
   at YamlDotNet.Serialization.ValueDeserializers.AliasValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
   at YamlDotNet.Serialization.Deserializer.Deserialize(IParser parser, Type type)
   at YamlDotNet.Serialization.Deserializer.Deserialize(TextReader input, Type type)
   at YamlDotNet.Serialization.Deserializer.Deserialize(TextReader input)
   at Program.Main(String[] commandLineArguments)
Aborted (core dumped)

go-yaml-json

 invalid_correct
yaml: line 2: mapping values are not allowed in this context

hs-hsyaml-event

 invalid_correct
Parsing error near byte offset Pos {posByteOffset = 5, posCharOffset = 5, posLine = 2, posColumn = 1} (Expected start of line)
+STR
+DOC
+SEQ []
=VAL :23
-SEQ

hs-hsyaml-json

 invalid_correct
hsyaml-parser: user error (Expected start of line)

java-snakeengine-event

 invalid_correct
Exception in thread "main" mapping values are not allowed here
 in reader, line 2, column 2:
    ]: 42
     ^

	at org.snakeyaml.engine.v2.scanner.ScannerImpl.fetchValue(ScannerImpl.java:836)
	at org.snakeyaml.engine.v2.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:351)
	at org.snakeyaml.engine.v2.scanner.ScannerImpl.checkToken(ScannerImpl.java:193)
	at org.snakeyaml.engine.v2.parser.ParserImpl$ParseFlowSequenceEntry.produce(ParserImpl.java:826)
	at org.snakeyaml.engine.v2.parser.ParserImpl.lambda$produce$0(ParserImpl.java:185)
	at java.util.Optional.ifPresent(Optional.java:159)
	at org.snakeyaml.engine.v2.parser.ParserImpl.produce(ParserImpl.java:185)
	at org.snakeyaml.engine.v2.parser.ParserImpl.hasNext(ParserImpl.java:210)
	at org.yaml.editor.SnakeEngine2Events.yamlToEvents(SnakeEngine2Events.java:15)
	at org.yaml.editor.SnakeEngine2Events.main(SnakeEngine2Events.java:23)

java-snakeengine-json

 invalid_correct
Exception in thread "main" mapping values are not allowed here
 in 'reader', line 2, column 2:
    ]: 42
     ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue(ScannerImpl.java:911)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:400)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:251)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseFlowSequenceEntry.produce(ParserImpl.java:790)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:166)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:59)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:45)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:140)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:119)
	at org.yaml.snakeyaml.composer.Composer.composeScalarNode(Composer.java:217)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:187)
	at org.yaml.snakeyaml.composer.Composer.composeSequenceNode(Composer.java:248)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:189)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:116)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:135)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:514)
	at org.yaml.editor.Snake2Json.yamlToJson(Snake2Json.java:20)
	at org.yaml.editor.Snake2Json.main(Snake2Json.java:27)

java-snakeyaml-event

 invalid_correct
Exception in thread "main" mapping values are not allowed here
 in 'reader', line 2, column 2:
    ]: 42
     ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue(ScannerImpl.java:911)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:400)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:251)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseFlowSequenceEntry.produce(ParserImpl.java:790)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:166)
	at org.yaml.snakeyaml.Yaml$3.hasNext(Yaml.java:677)
	at org.yaml.editor.Snake2Events.yamlToEvents(Snake2Events.java:134)
	at org.yaml.editor.Snake2Events.main(Snake2Events.java:142)

java-snakeyaml-json

 invalid_correct
Exception in thread "main" mapping values are not allowed here
 in 'reader', line 2, column 2:
    ]: 42
     ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue(ScannerImpl.java:911)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:400)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:251)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseFlowSequenceEntry.produce(ParserImpl.java:790)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:166)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:59)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:45)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:140)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:119)
	at org.yaml.snakeyaml.composer.Composer.composeScalarNode(Composer.java:217)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:187)
	at org.yaml.snakeyaml.composer.Composer.composeSequenceNode(Composer.java:248)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:189)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:116)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:135)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:514)
	at org.yaml.editor.Snake2Json.yamlToJson(Snake2Json.java:20)
	at org.yaml.editor.Snake2Json.main(Snake2Json.java:27)

js-jsyaml-json

 invalid_correct
/node/node_modules/js-yaml/lib/loader.js:187
  throw generateError(state, message);
  ^
YAMLException: end of the stream or a document separator is expected (2:2)

 1 | [23
 2 | ]: 42
------^
    at generateError (/node/node_modules/js-yaml/lib/loader.js:183:10)
    at throwError (/node/node_modules/js-yaml/lib/loader.js:187:9)
    at readDocument (/node/node_modules/js-yaml/lib/loader.js:1645:5)
    at loadDocuments (/node/node_modules/js-yaml/lib/loader.js:1688:5)
    at Object.loadAll (/node/node_modules/js-yaml/lib/loader.js:1701:19)
    at Object.<anonymous> (/yaml/bin/js-jsyaml-json:7:13)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)

js-yaml-event

 invalid_correct
Implicit keys need to be on a single line at line 1, column 1:

[23
^
+STR
+DOC

js-yaml-json

 invalid_correct
/yaml/bin/js-yaml-json:8
  if (doc.errors.length !== 0) throw doc.errors[0]
                               ^

YAMLParseError: Implicit keys need to be on a single line at line 1, column 1:

[23
^

    at Composer.onError (/node/node_modules/yaml/dist/compose/composer.js:71:34)
    at Object.resolveBlockMap (/node/node_modules/yaml/dist/compose/resolve-block-map.js:49:13)
    at Object.composeCollection (/node/node_modules/yaml/dist/compose/compose-collection.js:13:36)
    at Object.composeNode (/node/node_modules/yaml/dist/compose/compose-node.js:30:38)
    at Object.composeDoc (/node/node_modules/yaml/dist/compose/compose-doc.js:32:23)
    at Composer.next (/node/node_modules/yaml/dist/compose/composer.js:152:40)
    at next (<anonymous>)
    at Composer.compose (/node/node_modules/yaml/dist/compose/composer.js:134:25)
    at compose.next (<anonymous>)
    at Function.from (<anonymous>)

lua-lyaml-json

 invalid_correct
luajit: 2:1: mapping values are not allowed in this context
stack traceback:
	[C]: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:306: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:325: in function 'parse'
	/usr/local/share/lua/5.1/lyaml/init.lua:502: in function 'load'
	/yaml/bin/lua-lyaml-json:6: in main chunk
	[C]: at 0x5558b40e0f97

nim-nimyaml-event

 invalid_correct
/tmp/NimYAML-0.16.0/yaml/stream.nim(134) nimyaml_event
/tmp/NimYAML-0.16.0/yaml/stream.nim(106) next
Error: unhandled exception: Implicit mapping key may not be multiline [YamlStreamError]
+STR
+DOC

perl-pp-event

 invalid_correct
Line      : 2
Column    : 2
Expected  : EOL
Got       : COLON
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 392
YAML      : ": 42\n"
  at /yaml/bin/perl-pp-event line 25.
+STR
+DOC
+SEQ []
=VAL :23
-SEQ

perl-pp-json

 invalid_correct
Line      : 2
Column    : 2
Expected  : EOL
Got       : COLON
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 392
YAML      : ": 42\n"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-pp-perl

 invalid_correct
Line      : 2
Column    : 2
Expected  : EOL
Got       : COLON
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 392
YAML      : ": 42\n"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-pplibyaml-json

 invalid_correct
YAML::PP::LibYAML Error: The problem:

    mapping values are not allowed in this context

was found at , line: 2, column: 2

perl-pplibyaml-perl

 invalid_correct
YAML::PP::LibYAML Error: The problem:

    mapping values are not allowed in this context

was found at , line: 2, column: 2

perl-refparser-event

 invalid_correct
Parser finished before end of input at /perl5/lib/perl5/YAML/Parser.pm line 4056, <> line 1.

perl-syck-json

 invalid_correct
Syck parser (line 2, column 2): syntax error at /perl5/lib/perl5/x86_64-linux-thread-multi/YAML/Syck.pm line 60, <> line 1.

perl-syck-perl

 invalid_correct
Syck parser (line 2, column 2): syntax error at /perl5/lib/perl5/x86_64-linux-thread-multi/YAML/Syck.pm line 60, <> line 1.

perl-tiny-json

 invalid_correct
YAML::Tiny failed to classify line '[23' at /yaml/bin/perl-tiny-json line 12.

perl-tiny-perl

 invalid_correct
YAML::Tiny failed to classify line '[23' at /yaml/bin/perl-tiny-perl line 15.

perl-xs-json

 invalid_correct
YAML::XS::Load Error: The problem:

    mapping values are not allowed in this context

was found at document: 1, line: 2, column: 2

perl-xs-perl

 invalid_correct
YAML::XS::Load Error: The problem:

    mapping values are not allowed in this context

was found at document: 1, line: 2, column: 2

perl-yaml-json

 invalid_correct
YAML Error: Expected separator '---'
   Code: YAML_PARSE_ERR_NO_SEPARATOR
   Line: 1
   Document: 2
 at /perl5/lib/perl5/YAML/Loader.pm line 88.

perl-yaml-perl

 invalid_correct
YAML Error: Expected separator '---'
   Code: YAML_PARSE_ERR_NO_SEPARATOR
   Line: 1
   Document: 2
 at /perl5/lib/perl5/YAML/Loader.pm line 88.

py-pyyaml-event

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-event", line 7, in <module>
    for event in yaml.parse(sys.stdin.read()):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 46, in parse
    while loader.check_event():
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 193, in parse_document_end
    token = self.peek_token()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 129, in peek_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 223, in fetch_more_tokens
    return self.fetch_value()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 579, in fetch_value
    self.get_mark())
yaml.scanner.ScannerError: mapping values are not allowed here
  in "<unicode string>", line 2, column 2:
    ]: 42
     ^
+STR
+DOC
+SEQ []
=VAL :23
-SEQ

py-pyyaml-json

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-json", line 19, in <module>
    for doc in yaml.load_all(sys.stdin.read(), Loader=yaml.FullLoader):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 93, in load_all
    yield loader.get_data()
  File "/python/lib/python3.7/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 58, in compose_document
    self.get_event()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 118, in get_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 193, in parse_document_end
    token = self.peek_token()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 129, in peek_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 223, in fetch_more_tokens
    return self.fetch_value()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 579, in fetch_value
    self.get_mark())
yaml.scanner.ScannerError: mapping values are not allowed here
  in "<unicode string>", line 2, column 2:
    ]: 42
     ^

py-pyyaml-py

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-py", line 36, in <module>
    for doc in yaml.load_all(sys.stdin.read(), Loader=yaml.FullLoader):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 93, in load_all
    yield loader.get_data()
  File "/python/lib/python3.7/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 58, in compose_document
    self.get_event()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 118, in get_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 193, in parse_document_end
    token = self.peek_token()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 129, in peek_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 223, in fetch_more_tokens
    return self.fetch_value()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 579, in fetch_value
    self.get_mark())
yaml.scanner.ScannerError: mapping values are not allowed here
  in "<unicode string>", line 2, column 2:
    ]: 42
     ^

py-ruamel-event

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-event", line 7, in <module>
    for event in ruamel.yaml.parse(sys.stdin.read()):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/main.py", line 1024, in parse
    while loader._parser.check_event():
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 146, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 253, in parse_document_end
    token = self.scanner.peek_token()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 188, in peek_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 288, in fetch_more_tokens
    return self.fetch_value()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 661, in fetch_value
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: mapping values are not allowed here
  in "<unicode string>", line 2, column 2:
    ]: 42
     ^ (line: 2)
+STR
+DOC
+SEQ []
=VAL :23
-SEQ

py-ruamel-json

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-json", line 19, in <module>
    for doc in ruamel.yaml.load_all(sys.stdin.read(), Loader=ruamel.yaml.Loader):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/main.py", line 1097, in load_all
    yield loader._constructor.get_data()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/constructor.py", line 114, in get_data
    return self.construct_document(self.composer.get_node())
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 66, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 102, in compose_document
    self.parser.get_event()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 168, in get_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 253, in parse_document_end
    token = self.scanner.peek_token()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 188, in peek_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 288, in fetch_more_tokens
    return self.fetch_value()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 661, in fetch_value
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: mapping values are not allowed here
  in "<unicode string>", line 2, column 2:
    ]: 42
     ^ (line: 2)

py-ruamel-py

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-py", line 36, in <module>
    for doc in ruamel.yaml.load_all(sys.stdin.read(), Loader=ruamel.yaml.Loader):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/main.py", line 1097, in load_all
    yield loader._constructor.get_data()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/constructor.py", line 114, in get_data
    return self.construct_document(self.composer.get_node())
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 66, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 102, in compose_document
    self.parser.get_event()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 168, in get_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 253, in parse_document_end
    token = self.scanner.peek_token()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 188, in peek_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 288, in fetch_more_tokens
    return self.fetch_value()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 661, in fetch_value
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: mapping values are not allowed here
  in "<unicode string>", line 2, column 2:
    ]: 42
     ^ (line: 2)

raku-yamlish-json

 invalid_correct
Couldn't parse YAML
  in sub load-yamls at /raku/sources/44795C7AB0F35700F4CA9C3E2CC5C924EE4C608F (YAMLish) line 959
  in block <unit> at /yaml/bin/raku-yamlish-json line 6

raku-yamlish-raku

 invalid_correct
Couldn't parse YAML
  in sub load-yamls at /raku/sources/44795C7AB0F35700F4CA9C3E2CC5C924EE4C608F (YAMLish) line 959
  in block <unit> at /yaml/bin/raku-yamlish-raku line 6

ruby-psych-json

 invalid_correct
/ruby/gems/psych/lib/psych.rb:459:in `parse': (<unknown>): mapping values are not allowed in this context at line 2 column 2 (Psych::SyntaxError)
	from /ruby/gems/psych/lib/psych.rb:459:in `parse_stream'
	from /ruby/gems/psych/lib/psych.rb:565:in `load_stream'
	from /yaml/bin/ruby-psych-json:6:in `<main>'

rust-yamlrust-event

 invalid_correct
Error: ScanError { mark: Marker { index: 5, line: 2, col: 1 }, info: "mapping values are not allowed in this context" }
+STR
+DOC
+SEQ
=VAL :23
-SEQ