module FileUtils
module Rake
module Rake::Backtrace
module Rake::Cleaner
module Rake::Cloneable
module Rake::DSL
module Rake::FileUtilsExt
module Rake::InvocationExceptionMixin
module Rake::PrivateReader
module Rake::PrivateReader::ClassMethods
module Rake::TaskManager
module Rake::TraceOutput
module Rake::Version
module Rake::Win32
class Module
class Rake::Application
class Rake::CpuCounter
class Rake::DefaultLoader
class Rake::EarlyTime
class Rake::FileCreationTask
class Rake::FileList
class Rake::FileTask
class Rake::InvocationChain
class Rake::InvocationChain::EmptyInvocationChain
class Rake::LateTime
class Rake::LinkedList
class Rake::LinkedList::EmptyLinkedList
class Rake::MakefileLoader
class Rake::MultiTask
class Rake::NameSpace
class Rake::PackageTask
class Rake::Promise
class Rake::PseudoStatus
class Rake::RuleRecursionOverflowError
class Rake::Scope
class Rake::Scope::EmptyScope
class Rake::Task
class Rake::TaskArgumentError
class Rake::TaskArguments
class Rake::TaskLib
class Rake::TestTask
class Rake::ThreadHistoryDisplay
class Rake::ThreadPool
class Rake::Win32::Win32HomeError
class String
rake
13.2.1
# error?
def error? !@error.equal?(NOT_SET) end