# 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

dotnet-yamldotnet-event

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

dotnet-yamldotnet-json

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

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
        ^
+STR
+DOC
+MAP
=VAL :block

c-libfyaml-json

 invalid_correct
stdin:1:9: error: invalid comment without whitespace after block scalar indicator
block: ># comment
        ^

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:1699)
	at org.yaml.snakeyaml.scanner.ScannerImpl.scanBlockScalar(ScannerImpl.java:1566)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchBlockScalar(ScannerImpl.java:994)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchFolded(ScannerImpl.java:976)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:384)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:227)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:586)
	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 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:1699)
	at org.yaml.snakeyaml.scanner.ScannerImpl.scanBlockScalar(ScannerImpl.java:1566)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchBlockScalar(ScannerImpl.java:994)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchFolded(ScannerImpl.java:976)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:384)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:227)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:586)
	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.composeNode(Composer.java:136)
	at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:257)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:248)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:236)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:162)
	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: a line break is expected at line 1, column 9:
    block: ># comment
            ^
    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 readLineBreak (/node/node_modules/js-yaml/lib/js-yaml/loader.js:357:5)
    at readBlockScalar (/node/node_modules/js-yaml/lib/js-yaml/loader.js:834:5)
    at composeNode (/node/node_modules/js-yaml/lib/js-yaml/loader.js:1363:35)
    at readBlockMapping (/node/node_modules/js-yaml/lib/js-yaml/loader.js:1089:11)
    at composeNode (/node/node_modules/js-yaml/lib/js-yaml/loader.js:1359:12)
    at readDocument (/node/node_modules/js-yaml/lib/js-yaml/loader.js:1519:3)
    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)

js-yaml-event

 invalid_correct
Comments must be separated from other tokens by white space characters
+STR
+DOC
+MAP
=VAL :block

js-yaml-json

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

YAMLSemanticError: Comments must be separated from other tokens by white space characters
    at resolveNodeProps (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1469:25)
    at resolveNode (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1561:7)
    at resolveBlockMapItems (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1777:38)
    at Object.resolveMap [as resolve] (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1612:79)
    at resolveByTagName (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1384:25)
    at resolveTag (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1414:17)
    at resolveNodeValue (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1535:23)
    at Object.resolveNode (/node/node_modules/yaml/dist/resolveSeq-4a68b39b.js:1583:15)
    at parseContents (/node/node_modules/yaml/dist/Document-2cf6b08c.js:357:30)
    at Document.parse (/node/node_modules/yaml/dist/Document-2cf6b08c.js:615:5)

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: 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 538
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 538
YAML      : "# comment"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 92.

perl-pp-perl

 invalid_correct
Line      : 1
Column    : 9
Message   : Invalid block scalar
Where     : /perl5/lib/perl5/YAML/PP/Lexer.pm line 538
YAML      : "# comment"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 92.

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)