获取大量额外的错误信息＆＃34; ... / commands / console.rb：...＆＃34;

Question

我正在开发ruby on rails教程并使用rails控制台

当发生错误时，我看到的错误信息比教程显示的要多得多（可能是为了简洁而省略了它）

例如：

2.1.1 :001 > asdf
NameError: undefined local variable or method `asdf' for main:Object
    from (irb):1
    from /Users/me/.rvm/gems/ruby-2.1.1@global/gems/railties-4.0.4/lib/rails/commands/console.rb:90:in `start'
    from /Users/me/.rvm/gems/ruby-2.1.1@global/gems/railties-4.0.4/lib/rails/commands/console.rb:9:in `start'
    from /Users/me/.rvm/gems/ruby-2.1.1@global/gems/railties-4.0.4/lib/rails/commands.rb:62:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'
2.1.1 :002 > 

而教程只显示：

2.1.1 :001 > asdf
NameError: undefined local variable or method `asdf' for main:Object

其他信息有用吗？有没有办法压制它？