ruby - 为什么 kernel_require.rb 在我的堆栈跟踪中？

Question

我忘了在 if 语句的末尾加上 end 这个词，并得到以下错误:

/home/***/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': **/home/****/Desktop/ruby/food_finder/lib/restaurant.rb:84: syntax error, unexpected end-of-input, expecting keyword_end (SyntaxError)**
    from /home/****/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
    from /home/****/Desktop/ruby/food_finder/lib/guide.rb:1:in `<top (required)>'
    from /home/****/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
    from /home/****/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
    from init.rb:14:in `<main>'

我的代码没有错误:

def self.saved_restaurants
        # read the restaurant file
        restaurants = []
        if file_usable?
            file = File.new(@@filepath, 'r')

            file.each_line do |line|
                restaurants << Restaurant.new.import_line(line.chomp)
            end

            file.close
        **end** -- > forgotten end
        # return instances of restaurant
        return restaurants
    end

我的错误代码:

def self.saved_restaurants
        # read the restaurant file
        restaurants = []
        if file_usable?
            file = File.new(@@filepath, 'r')

            file.each_line do |line|
                restaurants << Restaurant.new.import_line(line.chomp)
            end

            file.close
         -- > forgotten end
        # return instances of restaurant
        return restaurants
    end

我的问题是:为什么我会收到与我的代码无关的错误？像下面这样:

/home/***/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': 

1. 这个错误是什么意思？

当我对 saved_restaurants 方法使用正确的语法时，我没有收到任何错误。

Answer 1

您的文件restaurant.rb 由guide.rb 中的方法调用require 读取，该方法定义在kernel_require.rb 中。 .在其方法定义中，它具有以下部分:

def require path

  ...

rescue LoadError => load_error

  ...

  raise load_error
end

当你在读取的文件中有语法错误时，会引发一个LoadError，它被拯救，并将作为一个错误引发require。