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• Source code size is inflated, though not by as much as other approaches.
• All error indicators must be checked after calling functions.
• Nesting function calls that all use this mechanism is problematic.
• Functions that fail must make sure the free any locally allocated resources.
• In general, combining registries of different sets of errors is difficult. For example, changing the above code to use errno is difficult and bug-prone; as one must be precisely aware of when C library functions set and clear errno, and one must be aware of all valid errno values before adding new ones.

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