// existing PCs in the deck. Flush the deck and retry handling
		// this pc.
		if id := b.emitLocation(); id > 0 {
			locs = append(locs, id)
		}

		// check cache again - previous emitLocation added a new entry
		if l, ok := b.locs[addr]; ok {
			locs = append(locs, l.id)
			stk = stk[len(l.pcs):] // skip the matching pcs.
		} else {