func (sp *sourcePrinter) handleUnprocessed(addrs map[uint64]addrInfo, unprocessed []uint64) {
	// makeFrames synthesizes a []plugin.Frame list for the specified address.
	// The result will typically have length 1, but may be longer if address corresponds
	// to inlined calls.
	makeFrames := func(addr uint64) []plugin.Frame {
		loc := addrs[addr].loc
		stack := make([]plugin.Frame, 0, len(loc.Line))