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Add notes on old posts

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Philipp Oppermann
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blog/content/old-posts/better-exception-messages.md
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> **Note**: This post describes how to handle exceptions using naked functions (see <a href="/handling-exceptions-with-naked-fns.html">“Handling Exceptions with Naked Functions”</a> for an overview). Our new way of handling exceptions can be found in the <a href="/handling-exceptions.html">“Handling Exceptions”</a> post.
## Exceptions in Detail
An exception signals that something is wrong with the currently-executed instruction. Whenever an exception occurs, the CPU interrupts its current work and starts an internal exception routine.