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for dealing with failure to return a value. The function returns in a defined way, but it does not return a value, so there is no need to invent a special value to return.

A variation on this is signal handling, which is done at the operating system level and not integrated into a programming language. Signal handlers can attempt some forms of recovery, such as terminating part of a computation, but without as much flexibility as fully integrated exception handling.

Non-returning functions

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