/datum/exception

When a runtime error occurs and /world/proc/Error() is defined, the first argument will be a populated exception datum.

When the EXCEPTION macro is used, a new exception will be generated. This can be used by a throw statement within a try/catch block, and the thrown exception will be caught in the catch statement.

Parity Issue ⚠️
In the OpenDream implementation of DreamMaker, this feature differs in implementation:
In try/catch blocks, if throw EXCEPTION is not used, no exception datum will be generated. Instead, the first argument to the catch block will be the text of the exception.
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