class RSpec::Core::ExampleGroup

def method_missing(name, *args)
  if self.class.respond_to?(name)
    raise WrongScopeError,
          "`#{name}` is not available from within an example (e.g. an " \
          "`it` block) or from constructs that run in the scope of an " \
          "example (e.g. `before`, `let`, etc). It is only available " \
          "on an example group (e.g. a `describe` or `context` block)."
  end
  super(name, *args)
end