fails:Binding#implicit_parameter_get raises a NameError for not existing numbered parameter
fails:Binding#implicit_parameter_get raises a NameError for not existing "it" parameter
fails:Binding#implicit_parameter_get raises a NameError when a numbered parameter is defined in a parent scope
fails:Binding#implicit_parameter_get raises a NameError when "it" parameter is defined in a parent scope
fails:Binding#implicit_parameter_get raises a NameError when a numbered parameter is defined in a nested scope
fails:Binding#implicit_parameter_get raises a NameError when "it" parameter is defined in a nested scope
