e.startValue = 0
	for i := range e.pieces {
		e.pieces[i] = VarLoc{}
	}
}

// canMerge reports whether a new location description is a superset
// of the (non-empty) pending location description, if so, the two
// can be merged (i.e., pending is still a valid and useful location
// description).
func canMerge(pending, new VarLoc) bool {
	if pending.absent() && new.absent() {
		return true
	}

// where the data-flow lattice has two elements, Symbolic and NonSymbolic with
// Symbolic > NonSymbolic.  The lattice has height = 2 so two iterations are
// sufficient to converge.
//
// We first do an optimistic analysis and, if it does not converge, we then fall
// back to a pessimistic analysis.  The optimistic analysis assigns the same
// symbolic predicate to all the merge nodes whose preceding enter nodes have

		sort.Strings(expected)
		if !reflect.DeepEqual(got[cluster], expected) {
			return fmt.Errorf("wanted %v got %v. All endpoints: %+v", expected, got[cluster], got)
		}
		return nil
	}, retry.Converge(2), retry.Timeout(time.Second*2), retry.Delay(time.Millisecond*10))
}

func expectServiceEndpointsFromIndex(t *testing.T, ei *model.EndpointIndex, svc *model.Service, port int, expected []EndpointResponse) {
	t.Helper()

		sortServiceTargets(instances)
		sortServiceTargets(expected)
		if err := compare(t, instances, expected); err != nil {
			return err
		}
		return nil
	}, retry.Converge(2), retry.Timeout(time.Second*5))
}

func expectEvents(t testing.TB, ch *xdsfake.Updater, events ...Event) {
	t.Helper()
	ch.StrictMatchOrFail(t, events...)
}

			// so that tests that run commands end up testing what's actually on disk.
			// If everything is up-to-date, this is a no-op.
			// We first build the toolchain twice to allow it to converge,
			// as when we first bootstrap.
			// See cmdbootstrap for a description of the overall process.
			//
			// On the builders, we skip this step: we assume that 'dist test' is

				// whether importFromModules returns nil for the package.
				// False-positives are ok: if we have a false-positive here, we'll do an
				// extra iteration of package loading this time, but we'll still
				// converge when the root set stops changing.
				//
				// In some sense, we can think of this as ‘upgraded the module providing
				// pkg.path from "none" to a version higher than "none"’.