Array
Binding
Class
Comparable
Config
Continuation
Date
Dir
Enumerable
FalseClass
File
FileUtils
Float
Gem
Hash
Integer
Kernal
Kernel
Logger
MatchData
Module
NackClass
NilClass
Numeric
Object
OpenStruct
Pathname
Proc
Range
Regexp
ScriptBug
String
Symbol
Time
TrueClass
UnboundMethod