"<top(required)>"在Ruby堆栈跟踪中的含义是什么？

Question

在Ruby 1.9.2堆栈跟踪中,我经常看到给出的方法<top (required)>,如下面的堆栈部分所示.这是什么意思？我的Ruby安装是否巧妙地破坏了？

Could not find abstract-1.0.0 in any of the sources
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/spec_set.rb:87:in `block in materialize'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/spec_set.rb:81:in `map!'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/spec_set.rb:81:in `materialize'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/definition.rb:90:in `specs'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/definition.rb:135:in `specs_for'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/definition.rb:124:in `requested_specs'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/environment.rb:23:in `requested_specs'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/runtime.rb:11:in `setup'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler.rb:107:in `setup'
/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/setup.rb:14:in `<top (required)>'
<internal:lib/rubygems/custom_require>:33:in `require'
<internal:lib/rubygems/custom_require>:33:in `rescue in require'
<internal:lib/rubygems/custom_require>:29:in `require'

Answer 1

它是文件的顶级,即在需要文件时运行的任何内容.
因此,如果在设置库期间出现问题(例如找不到某些必需文件),它将显示在堆栈跟踪中.