# YAML Test Matrix

--- &test-H7J7
  Title: Node anchor not indented
  Tags: [ anchor, error, indent, tag ]

YAML

key: &x
!!map
  a: b

Expected Events

+STR
+DOC
+MAP
=VAL :key
=VAL &x :

Expected JSON



cpp-yamlcpp-event

 invalid_incorrect
+STR
+DOC
+MAP
=VAL :key
+MAP &1 <tag:yaml.org,2002:map>
=VAL :a
=VAL :b
-MAP
-MAP
-DOC
-STR

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 +MAP |
   1    0    0    0 +PAIR|
   1    0    0    0 +NODE|
   1    0    0    0 +VAL |
   1    0    0    0 =TEXT|key
   1    3    3    3 -VAL |
   1    3    3    3 -NODE|
   1    3    3    3 =SYNX|:
   1    4    4    4 =WSPC|.
   1    5    5    5 +NODE|
   1    5    5    5 +PROP|
   1    5    5    5 +ANCH|
   1    5    5    5 =SYNX|&
   1    6    6    6 =META|x
   1    7    7    7 -ANCH|
   1    7    7    7 -PROP|
   1    7    7    7 +VAL |
   1    7    7    7 -VAL |
   1    7    7    7 -NODE|
   1    7    7    7 =EOL |\x0a
   2    0    8    8 -PAIR|
   2    0    8    8 -MAP |
   2    0    8    8 -NODE|
   2    0    8    8 -DOC |
   2    0    8    8 =ERR |Unexpected.'!'

js-jsyaml-json

 invalid_incorrect
{"key":{"a":"b"}}

rust-yamlrust-event

 invalid_incorrect
+STR
+DOC
+MAP
=VAL :key
+MAP &1
=VAL :a
=VAL :b
-MAP
-MAP
-DOC
-STR

c-libfyaml-event

 invalid_correct
stdin:2:1: error: invalid tag indent for mapping
!!map
^~~~~
+STR
+DOC
+MAP
=VAL :key

c-libfyaml-json

 invalid_correct
stdin:2:1: error: invalid tag indent for mapping
!!map
^~~~~

c-libyaml-event

 invalid_correct
Parse error: could not find expected ':'
+STR
+DOC
+MAP
=VAL :key

cpp-rapidyaml-event

 invalid_correct
-:3:1: (14B): ERROR: parse error - indentation should not increase at this point
-:3:1:   a: b  (size=6)
       ^~~~~~  (cols 1-7)

dotnet-yamldotnet-event

 invalid_correct
Unhandled exception. YamlDotNet.Core.SemanticErrorException: (Line: 3, Col: 3, Idx: 16) - (Line: 3, Col: 3, Idx: 16): While scanning a simple key, could not find expected ':'.
   at YamlDotNet.Core.Parser.ParseBlockMappingValue()
   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
+MAP
=VAL :key
=VAL &x :

dotnet-yamldotnet-json

 invalid_correct
Unhandled exception. YamlDotNet.Core.SemanticErrorException: (Line: 3, Col: 3, Idx: 16) - (Line: 3, Col: 3, Idx: 16): While scanning a simple key, could not find expected ':'.
   at YamlDotNet.Core.Parser.ParseBlockMappingValue()
   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.DictionaryNodeDeserializer.DeserializeHelper(Type tKey, Type tValue, IParser parser, Func`3 nestedObjectDeserializer, IDictionary result)
   at YamlDotNet.Serialization.NodeDeserializers.DictionaryNodeDeserializer.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 3: could not find expected ':'

hs-hsyaml-event

 invalid_correct
Parsing error near byte offset Pos {posByteOffset = 8, posCharOffset = 8, posLine = 2, posColumn = 0} (Unexpected '!')
+STR
+DOC
+MAP
=VAL :key
=VAL &x :
-MAP
-DOC

hs-hsyaml-json

 invalid_correct
hsyaml-parser: user error (Unexpected '!')

js-yaml-event

 invalid_correct
All mapping items must start at the same column at line 1, column 8:

key: &x
       ^
+STR
+DOC
+MAP
=VAL :key

js-yaml-json

 invalid_correct
/yaml/bin/js-yaml-json:9
    if (doc.errors.length !== 0) throw doc.errors[0]
                                 ^

YAMLParseError: All mapping items must start at the same column at line 1, column 8:

key: &x
       ^

    at Composer.onError (/node/node_modules/yaml/dist/compose/composer.js:69:34)
    at Object.resolveBlockMap (/node/node_modules/yaml/dist/compose/resolve-block-map.js:35:21)
    at resolveCollection (/node/node_modules/yaml/dist/compose/compose-collection.js:13:27)
    at Object.composeCollection (/node/node_modules/yaml/dist/compose/compose-collection.js:47:16)
    at Object.composeNode (/node/node_modules/yaml/dist/compose/compose-node.js:31:38)
    at Object.composeDoc (/node/node_modules/yaml/dist/compose/compose-doc.js:34:23)
    at Composer.next (/node/node_modules/yaml/dist/compose/composer.js:149:40)
    at next (<anonymous>)
    at Composer.compose (/node/node_modules/yaml/dist/compose/composer.js:131:25)
    at compose.next (<anonymous>) {
  code: 'BAD_INDENT',
  pos: [ 7, 8 ],
  linePos: [ { line: 1, col: 8 }, { line: 2, col: 1 } ]
}

Node.js v20.13.1

lua-lyaml-json

 invalid_correct
luajit: 1:1: could not find expected ':'
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:443: in function 'load_node'
	/usr/local/share/lua/5.1/lyaml/init.lua:378: in function 'load_node'
	/usr/local/share/lua/5.1/lyaml/init.lua:497: in function 'load'
	/yaml/bin/lua-lyaml-json:6: in main chunk
	[C]: at 0x55e2c9bd7ed0

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: Unexpected token (expected implicit mapping key): Indentation [YamlStreamError]
+STR
+DOC
+MAP
=VAL :key
=VAL &x :

perl-pp-event

 invalid_correct
Line      : 2
Column    : 6
Expected  : WS
Got       : EOL
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 392
YAML      : ""
  at /yaml/bin/perl-pp-event line 46.
+STR
+DOC
+MAP
=VAL :key
=VAL &x :

perl-pp-json

 invalid_correct
Line      : 2
Column    : 6
Expected  : WS
Got       : EOL
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 392
YAML      : ""
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-pp-perl

 invalid_correct
Line      : 2
Column    : 6
Expected  : WS
Got       : EOL
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 392
YAML      : ""
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-pplibyaml-json

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

    could not find expected ':'

was found at , line: 3, column: 3
while scanning a simple key at line: 2, column: 1

perl-pplibyaml-perl

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

    could not find expected ':'

was found at , line: 3, column: 3
while scanning a simple key at line: 2, column: 1

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 3, column 4): 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 3, column 4): 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 does not support a feature in line '&x' at /yaml/bin/perl-tiny-json line 12.

perl-tiny-perl

 invalid_correct
YAML::Tiny does not support a feature in line '&x' at /yaml/bin/perl-tiny-perl line 15.

perl-xs-json

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

    could not find expected ':'

was found at document: 1, line: 3, column: 3
while scanning a simple key at line: 2, column: 1

perl-xs-perl

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

    could not find expected ':'

was found at document: 1, line: 3, column: 3
while scanning a simple key at line: 2, column: 1

perl-yaml-json

 invalid_correct
YAML Error: Invalid element in map
   Code: YAML_LOAD_ERR_BAD_MAP_ELEMENT
   Line: 2
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 360.

perl-yaml-perl

 invalid_correct
YAML Error: Invalid element in map
   Code: YAML_LOAD_ERR_BAD_MAP_ELEMENT
   Line: 2
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 360.

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/python3.12/site-packages/yaml/__init__.py", line 75, in parse
    while loader.check_event():
          ^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 451, in parse_block_mapping_value
    return self.parse_block_node_or_indentless_sequence()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 271, in parse_block_node_or_indentless_sequence
    return self.parse_node(block=True, indentless_sequence=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 287, in parse_node
    if self.check_token(TagToken):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 162, in fetch_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 291, in stale_possible_simple_keys
    raise ScannerError("while scanning a simple key", key.mark,
yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 2, column 1:
    !!map
    ^
could not find expected ':'
  in "<unicode string>", line 3, column 3:
      a: b
      ^
+STR
+DOC
+MAP
=VAL :key

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/python3.12/site-packages/yaml/__init__.py", line 130, in load_all
    yield loader.get_data()
          ^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
                                   ^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 64, in compose_node
    if self.check_event(AliasEvent):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 451, in parse_block_mapping_value
    return self.parse_block_node_or_indentless_sequence()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 271, in parse_block_node_or_indentless_sequence
    return self.parse_node(block=True, indentless_sequence=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 287, in parse_node
    if self.check_token(TagToken):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 162, in fetch_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 291, in stale_possible_simple_keys
    raise ScannerError("while scanning a simple key", key.mark,
yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 2, column 1:
    !!map
    ^
could not find expected ':'
  in "<unicode string>", line 3, column 3:
      a: b
      ^

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/python3.12/site-packages/yaml/__init__.py", line 130, in load_all
    yield loader.get_data()
          ^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
                                   ^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 64, in compose_node
    if self.check_event(AliasEvent):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 451, in parse_block_mapping_value
    return self.parse_block_node_or_indentless_sequence()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 271, in parse_block_node_or_indentless_sequence
    return self.parse_node(block=True, indentless_sequence=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 287, in parse_node
    if self.check_token(TagToken):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 162, in fetch_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 291, in stale_possible_simple_keys
    raise ScannerError("while scanning a simple key", key.mark,
yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 2, column 1:
    !!map
    ^
could not find expected ':'
  in "<unicode string>", line 3, column 3:
      a: b
      ^

py-ruamel-event

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-event", line 9, in <module>
    for event in yaml.parse(sys.stdin.read()):
  File "/python/lib/python3.12/site-packages/ruamel/yaml/main.py", line 371, in parse
    while parser.check_event():
          ^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 141, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 639, in parse_block_mapping_value
    return self.parse_block_node_or_indentless_sequence()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 355, in parse_block_node_or_indentless_sequence
    return self.parse_node(block=True, indentless_sequence=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 381, in parse_node
    if self.scanner.check_token(TagToken):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 217, in fetch_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 348, in stale_possible_simple_keys
    raise ScannerError(
ruamel.yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 2, column 1:
    !!map
    ^ (line: 2)
could not find expected ':'
  in "<unicode string>", line 3, column 3:
      a: b
      ^ (line: 3)
+STR
+DOC
+MAP
=VAL :key

py-ruamel-json

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-json", line 21, in <module>
    for doc in yaml.load_all(sys.stdin.read()):
  File "/python/lib/python3.12/site-packages/ruamel/yaml/main.py", line 476, in load_all
    yield constructor.get_data()
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/constructor.py", line 110, in get_data
    return self.construct_document(self.composer.get_node())
                                   ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 63, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 94, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 130, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 211, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 106, in compose_node
    if self.parser.check_event(AliasEvent):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 141, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 639, in parse_block_mapping_value
    return self.parse_block_node_or_indentless_sequence()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 355, in parse_block_node_or_indentless_sequence
    return self.parse_node(block=True, indentless_sequence=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 381, in parse_node
    if self.scanner.check_token(TagToken):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 217, in fetch_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 348, in stale_possible_simple_keys
    raise ScannerError(
ruamel.yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 2, column 1:
    !!map
    ^ (line: 2)
could not find expected ':'
  in "<unicode string>", line 3, column 3:
      a: b
      ^ (line: 3)

py-ruamel-py

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-py", line 38, in <module>
    for doc in yaml.load_all(sys.stdin.read()):
  File "/python/lib/python3.12/site-packages/ruamel/yaml/main.py", line 476, in load_all
    yield constructor.get_data()
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/constructor.py", line 110, in get_data
    return self.construct_document(self.composer.get_node())
                                   ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 63, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 94, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 130, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 211, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 106, in compose_node
    if self.parser.check_event(AliasEvent):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 141, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 639, in parse_block_mapping_value
    return self.parse_block_node_or_indentless_sequence()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 355, in parse_block_node_or_indentless_sequence
    return self.parse_node(block=True, indentless_sequence=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 381, in parse_node
    if self.scanner.check_token(TagToken):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 217, in fetch_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 348, in stale_possible_simple_keys
    raise ScannerError(
ruamel.yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 2, column 1:
    !!map
    ^ (line: 2)
could not find expected ':'
  in "<unicode string>", line 3, column 3:
      a: b
      ^ (line: 3)

ruby-psych-json

 invalid_correct
/ruby/gems/psych/lib/psych.rb:458:in `parse': (<unknown>): could not find expected ':' while scanning a simple key at line 2 column 1 (Psych::SyntaxError)
	from /ruby/gems/psych/lib/psych.rb:458:in `parse_stream'
	from /ruby/gems/psych/lib/psych.rb:632:in `load_stream'
	from /yaml/bin/ruby-psych-json:6:in `<main>'