BEGIN class ensure nil self when END def false not super while alias defined? for or then yield and do if redo true __LINE__ begin else in rescue undef __FILE__ break elsif module retry unless __ENCODING__ case end next return until BasicObject Object ARGF.class Array Binding Dir Encoding Encoding::Converter Enumerator Enumerator::ArithmeticSequence Enumerator::Chain Enumerator::Lazy Enumerator::Yielder FalseClass Fiber File::Stat Hash IO File MatchData Method Module Class NilClass Numeric Complex Float Integer Rational ObjectSpace::WeakMap Proc Process::Status Random Range Regexp RubyVM RubyVM::AbstractSyntaxTree::Node RubyVM::InstructionSequence String Struct Process::Tms Symbol Thread Thread::Backtrace::Location Thread::ConditionVariable Thread::Mutex Thread::Queue Thread::SizedQueue ThreadGroup Time TracePoint TrueClass UnboundMethod Comparable Enumerable Errno File::Constants FileTest GC GC::Profiler IO::WaitReadable IO::WaitWritable Kernel Marshal Math ObjectSpace Process Process::GID Process::Sys Process::UID RubyVM::AbstractSyntaxTree RubyVM::MJIT Signal Warning ARGF ENV main
    