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Hash
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IOError
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IPSocket
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Integer
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Module
Monitor
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Net
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- HTTPVariantAlsoNegotiates
- HTTPVersionNotSupported
- IMAP
  - Address
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  - Authenticators
  - BodyStructure
  - BodyTypeBasic
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  - Config
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  - ContentDisposition
  - ContinuationRequest
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  - DataFormatError
  - DeprecatedClientOptions
  - ESearchResult
    PartialResult
  - Envelope
  - Error
  - ExtensionData
  - FetchData
  - FetchStruct
  - IgnoredResponse
  - InvalidParseData
  - LoginDisabledError
  - MailboxACLItem
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  - MailboxQuota
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  - Namespace
  - Namespaces
  - NumValidator
  - ResponseCode
  - ResponseParseError
    BadResponseError
    ByeResponseError
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    NoResponseError
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    UnknownResponseError
  - ResponseParser
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  - SASL
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    Authenticators
    ClientAdapter
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    ExternalAuthenticator
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    ProtocolAdapters
    Generic
    IMAP
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  - SASLAdapter
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  - SequenceSet
  - StatusData
  - StringPrep
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    Tables
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  - TaggedResponse
  - ThreadMember
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  - UntaggedResponse
  - VanishedData
- OpenTimeout
- POP3
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- POPMail
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- SMTP
  - Address
  - AuthCramMD5
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  - AuthPlain
  - AuthXoauth2
  - Authenticator
  - Response
- SMTPAuthenticationError
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- WriteAdapter
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Newton
NilClass
NoMatchingPatternError
NoMatchingPatternKeyError
NoMemoryError
NoMethodError
NotImplementedError
Numeric
Object
ObjectSpace
- InternalObjectWrapper
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Observable
Open3
OpenSSL
- ASN1
  - ASN1Data
  - ASN1Error
  - Constructive
  - ObjectId
  - Primitive
- BN
- BNError
- Buffering
  - Buffer
- Cipher
  - AuthTagError
  - Cipher
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- Config
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- Digest
  - DigestError
- Engine
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- HMAC
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- KDF
  - KDFError
- Marshal
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- Netscape
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- OCSP
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  - RecipientInfo
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- PKey
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  - PKey
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- Random
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- SSL
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  - SSLServer
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OpenStruct
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OptionParser
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PP
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PTY
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Pathname
PowerAssert
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PrettyPrint
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- CodeUnitsCache
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- ConstantPathOperatorWriteNode
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- IntegerBaseFlags
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Proc
Process
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Psych
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RBS
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- Parser
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- RDocPlugin
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    Any
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  - Block
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  - Spy
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RDoc
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- Encoding
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  - Darkfish
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  - Markup
  - POT
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    PO
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  - RI
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  - Locale
  - Text
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  - List
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  - Parser
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    MyStringScanner
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  - PreProcess
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  - RegexpHandling
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  - Verbatim
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- MethodAttr
- Mixin
- NormalClass
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  - C
  - ChangeLog
    Git
  - Markdown
  - PrismRuby
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  - RipperStateLex
  - Ruby
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  - BlockParser
  - Inline
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- RDoc
- RI
  - Driver
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    NotFoundError
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  - Paths
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- Servlet
- SingleClass
- Stats
  - Normal
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- Store
  - Error
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- Task
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- TomDoc
- TopLevel
REXML
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  - SAX2Parser
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  - UltraLightParser
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- Security
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- Text
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  - RelaxNG
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  - ZeroOrMore
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RSS
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    ClassMethods
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  - DuplicateLinkChecker
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  - Feed
    Author
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    Content
    Published
    Source
    Summary
    Generator
    Icon
    Id
    Link
    Logo
    Rights
    Subtitle
    Title
    Updated
  - PersonConstruct
    Email
    Name
    Uri
  - TextConstruct
  - URIContentModel
- BaseDublinCoreModel
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- ConversionError
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- Element
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- InvalidRSSError
- ListenerMixin
- Maker
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    Channel
    Cloud
    Description
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    SkipDays
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    SkipHours
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    Image
    Items
    Item
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    Feed
    Channel
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    Category
    Cloud
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    Links
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    Day
    SkipHours
    Hour
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    Items
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    Category
    Content
    Enclosure
    Guid
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    Link
    Source
    Categories
    Category
    Generator
    Icon
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    Link
    Logo
    Textinput
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  - AtomGenerator
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    EnsureXMLContent
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    AuthorBase
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    LinksBase
    LinkBase
    SkipDaysBase
    DayBase
    SkipHoursBase
    HourBase
    TitleBase
  - ContentModel
  - DublinCoreModel
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    ITunesImageBase
  - ImageBase
  - ImageFaviconModel
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    ImageItemBase
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    ContentBase
    DescriptionBase
    EnclosureBase
    GuidBase
    ITunesDuration
    ITunesImage
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    SourceBase
    IconBase
    LogoBase
    RightsBase
    SubtitleBase
    TitleBase
    TitleBase
  - RSS09
    Channel
    Authors
    Author
    Categories
    Category
    Cloud
    Contributors
    Contributor
    Copyright
    Description
    Generator
    Links
    Link
    SkipDays
    Day
    SkipHours
    Hour
    Title
    Image
    Items
    Item
    Authors
    Author
    Categories
    Category
    Content
    Contributors
    Contributor
    Description
    Enclosure
    Guid
    Links
    Link
    Rights
    Source
    Authors
    Author
    Categories
    Category
    Contributors
    Contributor
    Generator
    Icon
    Links
    Link
    Logo
    Rights
    Subtitle
    Title
    Title
    Textinput
  - RSS091
    Channel
    Image
    Items
    Item
    Textinput
  - RSS092
    Channel
    Image
    Items
    Item
    Textinput
  - RSS10
    Channel
    Authors
    Author
    Categories
    Category
    Cloud
    Contributors
    Contributor
    Copyright
    Description
    Generator
    Links
    Link
    SkipDays
    Day
    SkipHours
    Hour
    Title
    Image
    Items
    Item
    Authors
    Author
    Categories
    Category
    Content
    Contributors
    Contributor
    Description
    Enclosure
    Guid
    Links
    Link
    Rights
    Source
    Authors
    Author
    Categories
    Category
    Contributors
    Contributor
    Generator
    Icon
    Links
    Link
    Logo
    Rights
    Subtitle
    Title
    Title
    Textinput
  - RSS20
    Channel
    Categories
    Category
    Cloud
    Generator
    SkipDays
    Day
    SkipHours
    Hour
    Image
    Items
    Item
    Authors
    Author
    Categories
    Category
    Enclosure
    Guid
    Source
    Links
    Link
    Textinput
  - RSSBase
  - SetupDefaultDate
  - SetupDefaultLanguage
  - SlashModel
  - SyndicationModel
  - TaxonomyTopicModel
    TaxonomyTopicsBase
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  - TextinputBase
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  - XMLStyleSheets
    XMLStyleSheet
- MissingAttributeError
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- NSError
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- NotExpectedTagError
- NotSetError
- NotValidXMLParser
- NotWellFormedError
- OverlappedPrefixError
- Parser
- RDF
  - Bag
    Li
  - Channel
    Image
    Items
    Seq
    Textinput
  - Image
  - Li
  - Seq
    Li
  - Textinput
- REXMLLikeXMLParser
- REXMLListener
- REXMLParser
- RSS09
- RSS10
- RootElementMixin
- SetupMaker
- SlashModel
- SyndicationModel
- TaxonomyTopicModel
  - TaxonomyTopic
- TaxonomyTopicsModel
  - TaxonomyTopics
    Bag
- TooMuchTagError
- UnknownConversionMethodError
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- UnsupportedMakerVersionError
- Utils
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  - InheritedReader
  - YesOther
- XML
  - Element
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Racc
- Accept
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- DebugFlags
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Ractor
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Rake
- Application
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- FileCreationTask
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- MakefileLoader
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- Win32
Random
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Range
RangeError
Rational
RbConfig
Readline
Refinement
Regexp
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RegexpError
Reline
- ANSI
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- Core
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ReplTypeCompletor
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Resolv
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- LOC
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Rinda
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Ripper
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Ruby
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RubyVM
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- YJIT
RuntimeError
SOCKSSocket
ScriptError
SecureRandom
SecurityError
Set
Shellwords
Signal
SignalException
SimpleDelegator
SingleForwardable
Singleton
Socket
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- UDPSource
SocketError
StandardError
StopIteration
String
StringIO
StringScanner
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Struct
Symbol
SyntaxError
SyntaxSuggest
- AroundBlockScan
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- PathnameFromMessage
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Syslog
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SystemCallError
SystemExit
SystemStackError
TCPServer
TCPSocket
TSort
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Tempfile
Test
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    UTF8Line
    UnifiedDiffer
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Thread
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ThreadError
ThreadGroup
Time
Timeout
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TracePoint
TrueClass
TypeError
TypeProf
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  - Type
    Array
    Bot
    Hash
    Instance
    Proc
    Record
    Singleton
    Symbol
    Var
  - TypeAliasEntity
  - TypeAliasRead
  - TypeReadBox
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  - Message
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    Initialize
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    DidChange
    DidClose
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    Hover
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    Rename
    TypeDefinition
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    ExecuteCommand
  - Reader
    ProtocolError
  - Server
  - Text
  - Writer
UDPSocket
UNIXServer
UNIXSocket
URI
- BadURIError
- Error
- FTP
- File
- Generic
- HTTP
- HTTPS
- InvalidComponentError
- InvalidURIError
- LDAP
- LDAPS
- MailTo
- RFC2396_Parser
- RFC2396_REGEXP
  - PATTERN
- WS
- WSS
UnboundMethod
UncaughtThrowError
Vector
- ZeroVectorError
WIN32OLE
- Event
- Method
- Param
- Property
- QueryInterfaceError
- Record
- RuntimeError
- Type
- TypeLib
- Variable
- Variant
- VariantType
  - OLEProperty
Warning
WeakRef
- RefError
Win32
- Registry
  - API
  - Error
  - PredefinedKey
- Resolv
  - Error
XML
- Parser
XMLEncoding_ja
- SJISHandler
XMP
- StringInputMethod
YAML
- DBM
- Store
ZJIT
ZeroDivisionError
Zlib
- BufError
- DataError
- Deflate
- Error
- GzipFile
  - CRCError
  - Error
  - LengthError
  - NoFooter
- GzipReader
- GzipWriter
- InProgressError
- Inflate
- MemError
- NeedDict
- StreamEnd
- StreamError
- VersionError
- ZStream
fatal

Net::
POPError

class Net::POPError

Non-authentication POP3 protocol error (reply code “-ERR”, except authentication).

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