为什么“翻译"这个词会弄乱irb? [英] Why word 'translate' is messing irb?

问题描述

我不明白为什么我的方法 translate 未定义 start_with? 方法并且在 irb 中搞乱了一些东西，所以我只能按 Ctrl+d，不是 exit 或 quit:

<代码>>>你好".respond_to?(:start_with?)=>真的>>定义翻译(字符串)>>if string.start_with?("a", "e", "i", "o", "u")>>字符串 += "ay">>结尾>>结尾NoMethodError:未定义的方法start_with?"对于#<RubyVM::InstructionSequence:0x00000001d4c960>来自 (irb):3:在‘翻译’中来自/usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `
'>>你好".respond_to?(:start_with?)NoMethodError:未定义的方法start_with?"对于 <RubyVM::InstructionSequence:irb_binding@(irb)>:RubyVM::InstructionSequence来自 (irb):3:在‘翻译’中来自/usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `
'>>出口NoMethodError:未定义的方法start_with?"对于 <RubyVM::InstructionSequence:irb_binding@(irb)>:RubyVM::InstructionSequence来自 (irb):3:在‘翻译’中来自/usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `
'>>放弃NoMethodError:未定义的方法start_with?"对于 <RubyVM::InstructionSequence:irb_binding@(irb)>:RubyVM::InstructionSequence来自 (irb):3:在‘翻译’中来自/usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `
'>>

我尝试了两个不同的工作区，效果是一样的.
我的 Ruby 和 Rails 版本是:

~/workspace $ ruby​​ -v红宝石 2.3.0p0(2015-12-25 修订版 53290)[x86_64-linux]~/工作区 $ rails -v导轨 4.2.2

来自我的另一个问题我知道这个词 translate 被许多 I18N 库使用，所以它是我唯一的怀疑，因此这个问题的标题.但是作为初学者，我看不出任何关系.

解决方案

这是 YARV 中的一个错误 已在 YARV 2.4.0 中修复.

如果您没有 YARV 2.4.0，提交消息中提到了以下解决方法:

<块引用>

class <<RubyVM::指令序列定义翻译；结尾undef 翻译结尾

请注意，其他实现不受影响，只有 YARV.

I don't understand why my method translate undefines start_with? method and is messing something in irb, so I can exit irb only by pressing Ctrl+d, not exit or quit:

>> "hello".respond_to?(:start_with?)
=> true
>> def translate(string)                                                                                                                   
>>   if string.start_with?("a", "e", "i", "o", "u")
>>     string += "ay"                                                                                                                      
>> end
>> end
NoMethodError: undefined method `start_with?' for #<RubyVM::InstructionSequence:0x00000001d4c960>
        from (irb):3:in `translate'
        from /usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `<main>'
>> "hello".respond_to?(:start_with?)                                                                                                       
NoMethodError: undefined method `start_with?' for <RubyVM::InstructionSequence:irb_binding@(irb)>:RubyVM::InstructionSequence
        from (irb):3:in `translate'
        from /usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `<main>'
>> exit
NoMethodError: undefined method `start_with?' for <RubyVM::InstructionSequence:irb_binding@(irb)>:RubyVM::InstructionSequence
        from (irb):3:in `translate'
        from /usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `<main>'
>> quit
NoMethodError: undefined method `start_with?' for <RubyVM::InstructionSequence:irb_binding@(irb)>:RubyVM::InstructionSequence
        from (irb):3:in `translate'
        from /usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `<main>'
>>  

I tried two different workspaces and effect is the same.
My Ruby and Rails versions are:

~/workspace $ ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
~/workspace $ rails -v
Rails 4.2.2

from my other question I know that word translate is used by many I18N libraries, so it's my only suspect, hence the title of this question. However as a beginner, I don't see any relation.

解决方案

It is a bug in YARV that was fixed in YARV 2.4.0.

The commit message mentions the following workaround if you don't have YARV 2.4.0:

class << RubyVM::InstructionSequence
  def translate; end
  undef translate
end

Note that other implementations are not affected, only YARV.

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