This works. Note the extra [] is not present:
sage: P.<y> = QQ['x']
sage: y.divides(y)
True

On Monday, March 12, 2012 6:46:02 PM UTC+8, Simon King wrote:
>
> Hi! 
>
> Working on a very old bit-rotten patch of mine at #8992, the following 
> turns out to be a problem in one of the examples: 
>
> sage: P.<y> = QQ['x'][] 
> sage: y.divides(y) 
> --------------------------------------------------------------------------- 
>
> AttributeError                            Traceback (most recent call 
> last) 
> ... 
> AttributeError: 
> 'sage.rings.polynomial.polynomial_element.Polynomial_generic_dense' 
> object has no attribute 'quo_rem' 
>
> 22 months ago, this has not been a problem for my original patch. So, 
> I wonder: Is it a new bug? Or has it actually never worked? 
>
> Cheers, 
> Simon 
>

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