const_warning (Rake::Application)

          # File lib/rake.rb, line 1877
    1877:     def const_warning(const_name)
    1878:       @const_warning ||= false
    1879:       if ! @const_warning
    1880:         puts %{WARNING: Deprecated reference to top-level constant '#{const_name}'} +
    1881:           %{found at: #{rakefile_location}} # '
    1882:         puts %{    Use --classic-namespace on rake command}
    1883:         puts %{    or 'require "rake/classic_namespace"' in Rakefile}
    1884:       end
    1885:       @const_warning = true
    1886:     end