Bugs item #9661, was opened at 2007-03-29 00:56
You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=9661&group_id=426

Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Submitted By: Charles Nutter (headius)
Assigned to: Nobody (None)
Summary: String#[] does not use result of to_int

Initial Comment:
This seems like a bug...

class Foo
  def to_int
    3
  end
end

x = Foo.new
p x.object_id
y = "hello"
y[x] = "t"


...prints out...

76260
test.rb:10:in `[]=': index 76260 out of string (IndexError)
        from test.rb:10

So it appears that even though to_int is defined on my Foo class, aref tries to use the object ID to index into the string. It should use the result of to_int, no? 

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>Comment By: Charles Nutter (headius)
Date: 2007-03-29 00:58

Message:
This is potentially related to issue #7202.

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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=9661&group_id=426