a.sysStat = sysStat
	a.totalBytes = 0
}

// findSucc returns the first index in a such that addr is
// less than the base of the addrRange at that index.
func (a *addrRanges) findSucc(addr uintptr) int {
	base := offAddr{addr}

	// Narrow down the search space via a binary search
	// for large addrRanges until we have at most iterMax

			base:   250,
			expect: 50,
			ranges: large,
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			a := MakeAddrRanges(test.ranges...)
			i := a.FindSucc(test.base)
			if i != test.expect {
				t.Fatalf("expected %d, got %d", test.expect, i)
			}
		})
	}

	// any existing range.
	//
	// This will be used to look at what memory in the summary array is already
	// mapped before and after this new range.
	inUseIndex := p.inUse.findSucc(base)

	// Walk up the radix tree and map summaries in as needed.
	for l := range p.summary {
		// Figure out what part of the summary array this new address space needs.

	for _, r := range a.addrRanges.ranges {
		result = append(result, AddrRange{r})
	}
	return result
}

// FindSucc returns the successor to base. See addrRanges.findSucc
// for more details.
func (a *AddrRanges) FindSucc(base uintptr) int {
	return a.findSucc(base)
}

// Add adds a new AddrRange to the AddrRanges.
//
// The AddrRange must be mutable (i.e. created by NewAddrRanges),