module ObjectSpace
module Thor::Util
class Thor
class Thor::Error
class Thor::Options
class Thor::Options::Error
class Thor::Options::Hash
class Thor::OrderedHash
class Thor::PackageTask
class Thor::Runner
class Thor::Task
class Thor::TaskHash
thor
0.9.8
# valid?
def valid?(arg) @switches.key?(arg) or @shorts.key?(arg) end