From: Tim Pease <tim.pease@...>
Date: 2009-02-25T01:39:34+09:00
Subject: Re: better error reporting from eval?


On Feb 24, 2009, at 9:24 AM, matt neuburg wrote:

> This might seem silly, but it is only a reduced version of a real  
> issue.
> Consider the following:
>
> class Thing
>  def ev(what)
>    eval(what)
>  end
>  def bar()
>    1 + 1
>    nil + 2 # causing an exception in bar()
>  end
>  def foo
>    bar()
>  end
> end
>
> Thing.new.ev("foo()")
>

def ev(what)
   eval(what, binding, __FILE__, __LINE__)
end

You can pass along the filename and the line number that you want  
displayed when eval reports errors. The "binding" is simply the  
binding of your current Thing instance.

Blessings,
TwP