module Racc
class Array
class Object
class Racc::Accept
class Racc::ActionTable
class Racc::CompileError
class Racc::DebugFlags
class Racc::Error
class Racc::Goto
class Racc::Grammar
class Racc::Grammar::DefinitionEnv
class Racc::Grammar::PrecedenceDefinitionEnv
class Racc::GrammarFileParser
class Racc::GrammarFileParser::Result
class Racc::GrammarFileScanner
class Racc::ISet
class Racc::Item
class Racc::LocationPointer
class Racc::LogFileGenerator
class Racc::OrMark
class Racc::ParseError
class Racc::Parser
class Racc::ParserClassGenerator
class Racc::ParserFileGenerator
class Racc::ParserFileGenerator::Params
class Racc::Prec
class Racc::RRconflict
class Racc::Reduce
class Racc::Rule
class Racc::SRconflict
class Racc::Shift
class Racc::SourceText
class Racc::State
class Racc::StateTransitionTable
class Racc::StateTransitionTableGenerator
class Racc::States
class Racc::Sym
class Racc::SymbolTable
class Racc::UserAction
racc
1.6.2
# head?
def head? @index == 0 end