# YAML Test Matrix

--- &test-TD5N
  Title: Invalid scalar after sequence
  Tags: [ error, scalar, sequence ]

YAML

- item1
- item2
invalid

Expected Events

+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

Expected JSON



cpp-yamlcpp-event

 invalid_incorrect
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2
-SEQ
-DOC
+DOC
=VAL :invalid
-DOC
-STR

c-libfyaml-event

 invalid_correct
stdin:3:1: error: invalid scalar at the end of block sequence
invalid
^~~~~~~
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

c-libfyaml-json

 invalid_correct
stdin:3:1: error: invalid scalar at the end of block sequence
invalid
^~~~~~~

c-libyaml-event

 invalid_correct
Parse error: could not find expected ':'
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

dotnet-yamldotnet-event

 invalid_correct
Unhandled exception. YamlDotNet.Core.SyntaxErrorException: (Line: 4, Col: 1, Idx: 24) - (Line: 4, Col: 1, Idx: 24): While scanning a simple key, could not find expected ':'.
   at YamlDotNet.Core.Scanner.StaleSimpleKeys()
   at YamlDotNet.Core.Scanner.FetchMoreTokens()
   at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming()
   at YamlDotNet.Core.Parser.GetCurrentToken()
   at YamlDotNet.Core.Parser.ParseBlockSequenceEntry(Boolean isFirst)
   at YamlDotNet.Core.Parser.StateMachine()
   at YamlDotNet.Core.Parser.MoveNext()
   at Program.ConvertToLibYamlStyleAnnotatedEventStream(TextReader textReader, TextWriter textWriter)
   at Program.Main(String[] commandLineArguments)
Aborted (core dumped)
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

dotnet-yamldotnet-json

 invalid_correct
Unhandled exception. YamlDotNet.Core.SyntaxErrorException: (Line: 4, Col: 1, Idx: 24) - (Line: 4, Col: 1, Idx: 24): While scanning a simple key, could not find expected ':'.
   at YamlDotNet.Core.Scanner.StaleSimpleKeys()
   at YamlDotNet.Core.Scanner.FetchMoreTokens()
   at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming()
   at YamlDotNet.Core.Parser.GetCurrentToken()
   at YamlDotNet.Core.Parser.ParseBlockSequenceEntry(Boolean isFirst)
   at YamlDotNet.Core.Parser.StateMachine()
   at YamlDotNet.Core.Parser.MoveNext()
   at YamlDotNet.Core.ParserExtensions.Allow[T](IParser parser)
   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)

hs-hsyaml-event

 invalid_correct
Parsing error near byte offset Pos {posByteOffset = 16, posCharOffset = 16, posLine = 3, posColumn = 0} (Unexpected 'i')
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2
-SEQ
-DOC

hs-hsyaml-json

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

java-snakeyaml-event

 invalid_correct
Exception in thread "main" while scanning a simple key
 in 'reader', line 3, column 1:
    invalid
    ^
could not find expected ':'
 in 'reader', line 4, column 1:
    
    ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.stalePossibleSimpleKeys(ScannerImpl.java:464)
	at org.yaml.snakeyaml.scanner.ScannerImpl.needMoreTokens(ScannerImpl.java:278)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:226)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockSequenceEntry.produce(ParserImpl.java:502)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
	at org.yaml.snakeyaml.Yaml$3.hasNext(Yaml.java:654)
	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 simple key
 in 'reader', line 3, column 1:
    invalid
    ^
could not find expected ':'
 in 'reader', line 4, column 1:
    
    ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.stalePossibleSimpleKeys(ScannerImpl.java:464)
	at org.yaml.snakeyaml.scanner.ScannerImpl.needMoreTokens(ScannerImpl.java:278)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:226)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockSequenceEntry.produce(ParserImpl.java:502)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
	at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:148)
	at org.yaml.snakeyaml.composer.Composer.composeSequenceNode(Composer.java:208)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:95)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:134)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:494)
	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/js-yaml/loader.js:173
  throw generateError(state, message);
  ^
YAMLException: end of the stream or a document separator is expected at line 3, column 1:
    invalid
    ^
    at generateError (/node/node_modules/js-yaml/lib/js-yaml/loader.js:167:10)
    at throwError (/node/node_modules/js-yaml/lib/js-yaml/loader.js:173:9)
    at readDocument (/node/node_modules/js-yaml/lib/js-yaml/loader.js:1539:5)
    at loadDocuments (/node/node_modules/js-yaml/lib/js-yaml/loader.js:1575:5)
    at Object.loadAll (/node/node_modules/js-yaml/lib/js-yaml/loader.js:1583:19)
    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
Document contains trailing content not separated by a ... or --- line
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2
-SEQ
-DOC
-STR

js-yaml-json

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

YAMLSyntaxError: Document contains trailing content not separated by a ... or --- line
    at parseContents (/node/node_modules/yaml/dist/Document-2cf6b08c.js:353:25)
    at Document.parse (/node/node_modules/yaml/dist/Document-2cf6b08c.js:615:5)
    at Object.parseAllDocuments (/node/node_modules/yaml/dist/index.js:34:9)
    at Object.<anonymous> (/yaml/bin/js-yaml-json:7:19)
    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)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)

lua-lyaml-json

 invalid_correct
luajit: 2:3: could not find expected ':'
stack traceback:
	[C]: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:291: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:310: in function 'parse'
	/usr/local/share/lua/5.1/lyaml/init.lua:428: 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:482: in function 'load'
	/yaml/bin/lua-lyaml-json:6: in main chunk
	[C]: at 0x5614ad049f97

nim-nimyaml-event

 invalid_correct
/buildutils/nimyaml_event.nim(8) nimyaml_event
/tmp/NimYAML-0.13.1/yaml/stream.nim(223) finished
Error: unhandled exception: Unexpected token (expected block sequence indicator) [YamlStreamError]
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

perl-pp-event

 invalid_correct
Line      : 3
Column    : 1
Expected  : DASH DOC_END DOC_START EOL
Got       : PLAIN
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 386
YAML      : "invalid"
  at /yaml/bin/perl-pp-event line 25.
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

perl-pp-json

 invalid_correct
Line      : 3
Column    : 1
Expected  : DASH DOC_END DOC_START EOL
Got       : PLAIN
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 386
YAML      : "invalid"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 92.

perl-pp-perl

 invalid_correct
Line      : 3
Column    : 1
Expected  : DASH DOC_END DOC_START EOL
Got       : PLAIN
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 386
YAML      : "invalid"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 92.

perl-pplibyaml-event

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

    could not find expected ':'

was found at , line: 4, column: 1
while scanning a simple key at line: 3, column: 1

perl-pplibyaml-json

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

    could not find expected ':'

was found at , line: 4, column: 1
while scanning a simple key at line: 3, column: 1

perl-pplibyaml-perl

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

    could not find expected ':'

was found at , line: 4, column: 1
while scanning a simple key at line: 3, column: 1

perl-syck-json

 invalid_correct
Syck parser (line 4, column -1): 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 4, column -1): 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 'invalid' at /yaml/bin/perl-tiny-json line 12.

perl-tiny-perl

 invalid_correct
YAML::Tiny failed to classify line 'invalid' 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: 4, column: 1
while scanning a simple key at line: 3, column: 1

perl-xs-perl

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

    could not find expected ':'

was found at document: 1, line: 4, column: 1
while scanning a simple key at line: 3, column: 1

perl-yaml-json

 invalid_correct
YAML Error: Invalid element in sequence
   Code: YAML_LOAD_ERR_BAD_SEQ_ELEMENT
   Line: 3
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 397.

perl-yaml-perl

 invalid_correct
YAML Error: Invalid element in sequence
   Code: YAML_LOAD_ERR_BAD_SEQ_ELEMENT
   Line: 3
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 397.

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 382, in parse_block_sequence_entry
    if self.check_token(BlockEntryToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 115, in check_token
    while self.need_more_tokens():
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 152, in need_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 292, in stale_possible_simple_keys
    "could not find expected ':'", self.get_mark())
yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 3, column 1:
    invalid
    ^
could not find expected ':'
  in "<unicode string>", line 4, column 1:
    
    ^
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

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 82, in compose_node
    node = self.compose_sequence_node(anchor)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 110, in compose_sequence_node
    while not self.check_event(SequenceEndEvent):
  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 382, in parse_block_sequence_entry
    if self.check_token(BlockEntryToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 115, in check_token
    while self.need_more_tokens():
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 152, in need_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 292, in stale_possible_simple_keys
    "could not find expected ':'", self.get_mark())
yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 3, column 1:
    invalid
    ^
could not find expected ':'
  in "<unicode string>", line 4, column 1:
    
    ^

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 82, in compose_node
    node = self.compose_sequence_node(anchor)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 110, in compose_sequence_node
    while not self.check_event(SequenceEndEvent):
  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 382, in parse_block_sequence_entry
    if self.check_token(BlockEntryToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 115, in check_token
    while self.need_more_tokens():
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 152, in need_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 292, in stale_possible_simple_keys
    "could not find expected ':'", self.get_mark())
yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 3, column 1:
    invalid
    ^
could not find expected ':'
  in "<unicode string>", line 4, column 1:
    
    ^

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 510, in parse_block_sequence_entry
    if self.scanner.check_token(BlockEntryToken):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 169, in check_token
    while self.need_more_tokens():
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 206, in need_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 359, in stale_possible_simple_keys
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 3, column 1:
    invalid
    ^ (line: 3)
could not find expected ':'
  in "<unicode string>", line 4, column 1:
    
    ^ (line: 4)
+STR
+DOC
+SEQ
=VAL :item1
=VAL :item2

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 136, in compose_node
    node = self.compose_sequence_node(anchor)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 179, in compose_sequence_node
    while not self.parser.check_event(SequenceEndEvent):
  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 510, in parse_block_sequence_entry
    if self.scanner.check_token(BlockEntryToken):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 169, in check_token
    while self.need_more_tokens():
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 206, in need_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 359, in stale_possible_simple_keys
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 3, column 1:
    invalid
    ^ (line: 3)
could not find expected ':'
  in "<unicode string>", line 4, column 1:
    
    ^ (line: 4)

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 136, in compose_node
    node = self.compose_sequence_node(anchor)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 179, in compose_sequence_node
    while not self.parser.check_event(SequenceEndEvent):
  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 510, in parse_block_sequence_entry
    if self.scanner.check_token(BlockEntryToken):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 169, in check_token
    while self.need_more_tokens():
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 206, in need_more_tokens
    self.stale_possible_simple_keys()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 359, in stale_possible_simple_keys
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a simple key
  in "<unicode string>", line 3, column 1:
    invalid
    ^ (line: 3)
could not find expected ':'
  in "<unicode string>", line 4, column 1:
    
    ^ (line: 4)

ruby-psych-json

 invalid_correct
/usr/lib/ruby/2.5.0/psych.rb:405:in `parse': (<unknown>): could not find expected ':' while scanning a simple key at line 3 column 1 (Psych::SyntaxError)
	from /usr/lib/ruby/2.5.0/psych.rb:405:in `parse_stream'
	from /usr/lib/ruby/2.5.0/psych.rb:488:in `load_stream'
	from /yaml/bin/ruby-psych-json:6:in `<main>'