}
}

type writeUserArenaHeapBits struct {
	offset uintptr // offset in span that the low bit of mask represents the pointer state of.
	mask   uintptr // some pointer bits starting at the address addr.
	valid  uintptr // number of bits in buf that are valid (including low)
	low    uintptr // number of low-order bits to not overwrite
}

func (s *mspan) writeUserArenaHeapBits(addr uintptr) (h writeUserArenaHeapBits) {

			"(*gcWork).tryGetFast",
			"(*guintptr).set",
			"(*markBits).advance",
			"(*mspan).allocBitsForIndex",
			"(*mspan).base",
			"(*mspan).markBitsForBase",
			"(*mspan).markBitsForIndex",
			"(*mspan).writeUserArenaHeapBits",
			"(*muintptr).set",
			"(*puintptr).set",
			"(*wbBuf).get1",
			"(*wbBuf).get2",

			// Trace-related ones.
			"traceLocker.ok",
			"traceEnabled",
		},
		"runtime/internal/sys": {},