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#### - -uses=System - Swap; HeapError; etc.

A few exotic BP routines and declarations (e.g., `Swap` and `HeapError`) are contained in a `System` unit, System, which GPC (unlike BP) does not automatically use in each program. To use it, you can add a `uses System;` clause to your program. If you don't want to change your code, the command line option `--uses=System` will do the same.