How can I trap a specific error message from a common event?
As a simple example, assume you’re using the builtin street grammar and the caller requests a street in a city that isn’t included in that grammar. In this situation, the interpreter throws an error.badfetch event. You can include a catch handler for error.badfetch, using the _message variable to discover specifics of the thrown event. In our example, the message would include the words “No Street Grammar”.
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