They are used interchangeably and it doesn't matter too much. You can
always do "p (error_t)rc" in gdb. The reason a few things like
get_privileged_ports might have been written with kern_return_t instead of
error_t was that they were theoretically Mach interfaces that would exist
on a non-Hurd Mach system too, way back before the dawn of time when we
might have cared about other Mach-based Unix systems.
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