# YAML Test Matrix

--- &test-X4QW
  Title: Comment without whitespace after block scalar indicator
  Tags: [ comment, error, folded, whitespace ]

YAML

block: ># comment
  scalar

Expected Events

+STR
+DOC
+MAP
=VAL :block

Expected JSON



c-libyaml-event

 invalid_incorrect
+STR
+DOC
+MAP
=VAL :block
=VAL >scalar\n
-MAP
-DOC
-STR

cpp-yamlcpp-event

 invalid_incorrect
+STR
+DOC
+MAP
=VAL :block
=VAL :scalar\n
-MAP
-DOC
-STR

lua-lyaml-json

 invalid_incorrect
{"block":"scalar\n"}

perl-pplibyaml-event

 invalid_incorrect
+STR
+DOC
+MAP
=VAL :block
=VAL >scalar\n
-MAP
-DOC
-STR

perl-pplibyaml-json

 invalid_incorrect
{
   "block" : "scalar\n"
}

perl-pplibyaml-perl

 invalid_incorrect
{
  'block' => 'scalar
'
}

perl-syck-json

 invalid_incorrect
{
   "block" : "># comment scalar"
}

perl-syck-perl

 invalid_incorrect
{
  'block' => '># comment scalar'
}

perl-tiny-json

 invalid_incorrect
{
   "block" : "scalar\n"
}

perl-tiny-perl

 invalid_incorrect
{
  'block' => 'scalar
'
}

perl-xs-json

 invalid_incorrect
{
   "block" : "scalar\n"
}

perl-xs-perl

 invalid_incorrect
{
  'block' => 'scalar
'
}

ruby-psych-json

 invalid_incorrect
{"block":"scalar\n"}

c-libfyaml-event

 invalid_correct
stdin:1:9: error: invalid comment without whitespace after block scalar indicator
block: ># comment
        ^
[NOT]: fy_fetch_block_scalar() failed
[NOT]: fy_fetch_tokens() failed
[NOT]: failed to peek token
+STR
+DOC
+MAP
=VAL :block

c-libfyaml-json

 invalid_correct
stdin:1:9: error: invalid comment without whitespace after block scalar indicator
block: ># comment
        ^
[NOT]: fy_fetch_block_scalar() failed
[NOT]: fy_fetch_tokens() failed
[NOT]: failed to peek token

dotnet-yamldotnet-event

 invalid_correct
Unhandled exception. YamlDotNet.Core.SyntaxErrorException: (Line: 1, Col: 8, Idx: 7) - (Line: 1, Col: 9, Idx: 8): While scanning a block scalar, found a comment without whtespace after '>' indicator.
   at YamlDotNet.Core.Scanner.ScanBlockScalar(Boolean isLiteral)
   at YamlDotNet.Core.Scanner.FetchBlockScalar(Boolean isLiteral)
   at YamlDotNet.Core.Scanner.FetchNextToken()
   at YamlDotNet.Core.Scanner.FetchMoreTokens()
   at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming()
   at YamlDotNet.Core.Parser.GetCurrentToken()
   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 :block

dotnet-yamldotnet-json

 invalid_correct
Unhandled exception. YamlDotNet.Core.SyntaxErrorException: (Line: 1, Col: 8, Idx: 7) - (Line: 1, Col: 9, Idx: 8): While scanning a block scalar, found a comment without whtespace after '>' indicator.
   at YamlDotNet.Core.Scanner.ScanBlockScalar(Boolean isLiteral)
   at YamlDotNet.Core.Scanner.FetchBlockScalar(Boolean isLiteral)
   at YamlDotNet.Core.Scanner.FetchNextToken()
   at YamlDotNet.Core.Scanner.FetchMoreTokens()
   at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming()
   at YamlDotNet.Core.Parser.GetCurrentToken()
   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)

hs-hsyaml-event

 invalid_correct
Parsing error near byte offset Pos {posByteOffset = 8, posCharOffset = 8, posLine = 1, posColumn = 8} (Unexpected '#')
+STR
+DOC
+MAP
=VAL :block
=VAL >

hs-hsyaml-json

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

java-snakeyaml-event

 invalid_correct
Exception in thread "main" while scanning a block scalar
 in 'reader', line 1, column 8:
    block: ># comment
           ^
expected chomping or indentation indicators, but found #(35)
 in 'reader', line 1, column 9:
    block: ># comment
            ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.scanBlockScalarIndicators(ScannerImpl.java:1770)
	at org.yaml.snakeyaml.scanner.ScannerImpl.scanBlockScalar(ScannerImpl.java:1634)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchBlockScalar(ScannerImpl.java:1015)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchFolded(ScannerImpl.java:997)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:405)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:248)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:665)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:165)
	at org.yaml.snakeyaml.Yaml$3.hasNext(Yaml.java:677)
	at org.yaml.editor.Snake2Events.yamlToEvents(Snake2Events.java:111)
	at org.yaml.editor.Snake2Events.main(Snake2Events.java:119)

java-snakeyaml-json

 invalid_correct
Exception in thread "main" while scanning a block scalar
 in 'reader', line 1, column 8:
    block: ># comment
           ^
expected chomping or indentation indicators, but found #(35)
 in 'reader', line 1, column 9:
    block: ># comment
            ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.scanBlockScalarIndicators(ScannerImpl.java:1770)
	at org.yaml.snakeyaml.scanner.ScannerImpl.scanBlockScalar(ScannerImpl.java:1634)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchBlockScalar(ScannerImpl.java:1015)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchFolded(ScannerImpl.java:997)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:405)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:248)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:665)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:165)
	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:214)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:184)
	at org.yaml.snakeyaml.composer.Composer.composeKeyNode(Composer.java:310)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:301)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:286)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:188)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:115)
	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:18)
	at org.yaml.editor.Snake2Json.main(Snake2Json.java:25)

js-jsyaml-json

 invalid_correct
/node/node_modules/js-yaml/lib/loader.js:187
  throw generateError(state, message);
  ^
YAMLException: a line break is expected (1:9)

 1 | block: ># comment
-------------^
 2 |   scalar
    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 readLineBreak (/node/node_modules/js-yaml/lib/loader.js:391:5)
    at readBlockScalar (/node/node_modules/js-yaml/lib/loader.js:879:5)
    at composeNode (/node/node_modules/js-yaml/lib/loader.js:1445:35)
    at readBlockMapping (/node/node_modules/js-yaml/lib/loader.js:1164:11)
    at composeNode (/node/node_modules/js-yaml/lib/loader.js:1441:12)
    at readDocument (/node/node_modules/js-yaml/lib/loader.js:1625:3)
    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)

js-yaml-event

 invalid_correct
Comments must be separated from other tokens by white space characters at line 1, column 9:

block: ># comment
        ^^^^^^^^^
+STR
+DOC
+MAP
=VAL :block
=VAL >scalar\n
-MAP
-DOC
-STR

js-yaml-json

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

YAMLParseError: Comments must be separated from other tokens by white space characters at line 1, column 9:

block: ># comment
        ^^^^^^^^^

    at Composer.onError (/node/node_modules/yaml/dist/compose/composer.js:71:34)
    at parseBlockScalarHeader (/node/node_modules/yaml/dist/compose/resolve-block-scalar.js:154:21)
    at Object.resolveBlockScalar (/node/node_modules/yaml/dist/compose/resolve-block-scalar.js:7:20)
    at Object.composeScalar (/node/node_modules/yaml/dist/compose/compose-scalar.js:10:30)
    at composeNode (/node/node_modules/yaml/dist/compose/compose-node.js:23:34)
    at Object.resolveBlockMap (/node/node_modules/yaml/dist/compose/resolve-block-map.js:73:19)
    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:31:23)
    at Composer.next (/node/node_modules/yaml/dist/compose/composer.js:152:40)

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: Illegal character in block scalar header: "#" [YamlStreamError]
+STR
+DOC
+MAP
=VAL :block

perl-pp-event

 invalid_correct
Line      : 1
Column    : 9
Message   : Invalid block scalar
Where     : /perl5/lib/perl5/YAML/PP/Lexer.pm line 544
YAML      : "# comment"
  at /yaml/bin/perl-pp-event line 25.
+STR
+DOC
+MAP
=VAL :block

perl-pp-json

 invalid_correct
Line      : 1
Column    : 9
Message   : Invalid block scalar
Where     : /perl5/lib/perl5/YAML/PP/Lexer.pm line 544
YAML      : "# comment"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-pp-perl

 invalid_correct
Line      : 1
Column    : 9
Message   : Invalid block scalar
Where     : /perl5/lib/perl5/YAML/PP/Lexer.pm line 544
YAML      : "# comment"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-refparser-event

 invalid_correct
Parser finished before end of input at /perl5/lib/perl5/YAML/Parser.pm line 4047, <> line 1.

perl-yaml-json

 invalid_correct
YAML Error: Inconsistent indentation level
   Code: YAML_PARSE_ERR_INCONSISTENT_INDENTATION
   Line: 2
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 804.

perl-yaml-perl

 invalid_correct
YAML Error: Inconsistent indentation level
   Code: YAML_PARSE_ERR_INCONSISTENT_INDENTATION
   Line: 2
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 804.

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 75, 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 449, in parse_block_mapping_value
    if not self.check_token(KeyToken, ValueToken, BlockEndToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 243, in fetch_more_tokens
    return self.fetch_folded()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 638, in fetch_folded
    self.fetch_block_scalar(style='>')
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 649, in fetch_block_scalar
    self.tokens.append(self.scan_block_scalar(style))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 989, in scan_block_scalar
    chomping, increment = self.scan_block_scalar_indicators(start_mark)
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1089, in scan_block_scalar_indicators
    % ch, self.get_mark())
yaml.scanner.ScannerError: while scanning a block scalar
  in "<unicode string>", line 1, column 8:
    block: ># comment
           ^
expected chomping or indentation indicators, but found '#'
  in "<unicode string>", line 1, column 9:
    block: ># comment
            ^
+STR
+DOC
+MAP
=VAL :block

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 130, 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 55, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 64, in compose_node
    if self.check_event(AliasEvent):
  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 449, in parse_block_mapping_value
    if not self.check_token(KeyToken, ValueToken, BlockEndToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 243, in fetch_more_tokens
    return self.fetch_folded()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 638, in fetch_folded
    self.fetch_block_scalar(style='>')
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 649, in fetch_block_scalar
    self.tokens.append(self.scan_block_scalar(style))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 989, in scan_block_scalar
    chomping, increment = self.scan_block_scalar_indicators(start_mark)
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1089, in scan_block_scalar_indicators
    % ch, self.get_mark())
yaml.scanner.ScannerError: while scanning a block scalar
  in "<unicode string>", line 1, column 8:
    block: ># comment
           ^
expected chomping or indentation indicators, but found '#'
  in "<unicode string>", line 1, column 9:
    block: ># comment
            ^

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 130, 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 55, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 64, in compose_node
    if self.check_event(AliasEvent):
  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 449, in parse_block_mapping_value
    if not self.check_token(KeyToken, ValueToken, BlockEndToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 243, in fetch_more_tokens
    return self.fetch_folded()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 638, in fetch_folded
    self.fetch_block_scalar(style='>')
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 649, in fetch_block_scalar
    self.tokens.append(self.scan_block_scalar(style))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 989, in scan_block_scalar
    chomping, increment = self.scan_block_scalar_indicators(start_mark)
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1089, in scan_block_scalar_indicators
    % ch, self.get_mark())
yaml.scanner.ScannerError: while scanning a block scalar
  in "<unicode string>", line 1, column 8:
    block: ># comment
           ^
expected chomping or indentation indicators, but found '#'
  in "<unicode string>", line 1, column 9:
    block: ># comment
            ^

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 907, in parse
    while loader._parser.check_event():
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 140, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 603, in parse_block_mapping_value
    if self.scanner.check_token(ValueToken):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 303, in fetch_more_tokens
    return self.fetch_folded()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 712, in fetch_folded
    self.fetch_block_scalar(style='>')
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 721, in fetch_block_scalar
    self.tokens.append(self.scan_block_scalar(style))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1154, in scan_block_scalar
    chomping, increment = self.scan_block_scalar_indicators(start_mark)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1299, in scan_block_scalar_indicators
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a block scalar
  in "<unicode string>", line 1, column 8:
    block: ># comment
           ^ (line: 1)
expected chomping or indentation indicators, but found '#'
  in "<unicode string>", line 1, column 9:
    block: ># comment
            ^ (line: 1)
+STR
+DOC
+MAP
=VAL :block

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 976, in load_all
    yield loader._constructor.get_data()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/constructor.py", line 106, in get_data
    return self.construct_document(self.composer.get_node())
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 68, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 101, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 138, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 218, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 111, in compose_node
    if self.parser.check_event(AliasEvent):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 140, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 603, in parse_block_mapping_value
    if self.scanner.check_token(ValueToken):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 303, in fetch_more_tokens
    return self.fetch_folded()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 712, in fetch_folded
    self.fetch_block_scalar(style='>')
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 721, in fetch_block_scalar
    self.tokens.append(self.scan_block_scalar(style))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1154, in scan_block_scalar
    chomping, increment = self.scan_block_scalar_indicators(start_mark)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1299, in scan_block_scalar_indicators
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a block scalar
  in "<unicode string>", line 1, column 8:
    block: ># comment
           ^ (line: 1)
expected chomping or indentation indicators, but found '#'
  in "<unicode string>", line 1, column 9:
    block: ># comment
            ^ (line: 1)

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 976, in load_all
    yield loader._constructor.get_data()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/constructor.py", line 106, in get_data
    return self.construct_document(self.composer.get_node())
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 68, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 101, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 138, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 218, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 111, in compose_node
    if self.parser.check_event(AliasEvent):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 140, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 603, in parse_block_mapping_value
    if self.scanner.check_token(ValueToken):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 303, in fetch_more_tokens
    return self.fetch_folded()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 712, in fetch_folded
    self.fetch_block_scalar(style='>')
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 721, in fetch_block_scalar
    self.tokens.append(self.scan_block_scalar(style))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1154, in scan_block_scalar
    chomping, increment = self.scan_block_scalar_indicators(start_mark)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1299, in scan_block_scalar_indicators
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a block scalar
  in "<unicode string>", line 1, column 8:
    block: ># comment
           ^ (line: 1)
expected chomping or indentation indicators, but found '#'
  in "<unicode string>", line 1, column 9:
    block: ># comment
            ^ (line: 1)