From: "Decurnex Gorosito, Roberto Eduardo" <decurnex.roberto@...>
Date: 2007-12-23T03:06:49+09:00
Subject: Re: no method error (because of unknown variable type)

Sebastian Hungerecker wrote:
> Haris Bogdanovic wrote:
>   
>> I get an error message that eof method is undefined.
>> I presume that this is because ruby does not know that the "file" variable
>> is going to become a File.object.
>>     
>
> You assume you get the error message when the method is defined. This is not 
> true. The error is raised when the method is actually called (with a file 
> object as a parameter). At this point ruby already knows that file is a File 
> object (because that's what was passed into the method) - that's not the 
> problem. The problem is that File objects don't have an eof method. It's eof? 
> (with a question mark).
>
>
> HTH,
> Sebastian
>   

I insist, is not a problem of eof or eof?, they are both defined. The 
problem is that he is calling eof for a IO open to write but not to read.