In the code below, the equation within the itemize environment is too wide for the page, but I don't get an overfull hbox warning (which I find annoying because it's sometimes useful to know exactly how wide an overfull hbox is). 

I'd like to know how to get the compiler to produce the 'usual' overfull hbox warning in these circumstances. I'm also curious as to why this happens. Any help will be much appreciated. 

```
\documentclass[a4paper,12pt,draft]{article}  
\usepackage{amsmath}  
%  
\begin{document}  
The text that appears here shows the complete page width.
No doubt the long equation displays ok now.  
\begin{align}  
A + Bz + Cz^2 + Dz^3 + Ez^4 + Fz^5 + G z^6 + H z^7 + I z^8 + J z^9 + K z^{10} = 0.  
\end{align}  
%  
\begin{itemize}  
\item The text that appears here shows the width within the list.
The equation below will overspill the right
margin, without producing a warning.  
\begin{align}  
A + Bz + Cz^2 + Dz^3 + Ez^4 + Fz^5 + G z^6 + H z^7 + I z^8 + J z^9 + K z^{10} = 0.  
\end{align}  
\end{itemize}  
\end{document}

```