remove uses of Set.List

Since the set can be iterated over directly, we no longer need to copy
the values into a new slice.

dag/dag.go

@@ -175,10 +175,9 @@ func (g *AcyclicGraph) Walk(cb WalkFunc) tfdiags.Diagnostics {
 
 // simple convenience helper for converting a dag.Set to a []Vertex
 func AsVertexList(s Set) []Vertex {
-	rawList := s.List()
+	vertexList := make([]Vertex, 0, len(s))
-	vertexList := make([]Vertex, len(rawList))
+	for _, raw := range s {
-	for i, raw := range rawList {
+		vertexList = append(vertexList, raw.(Vertex))
-		vertexList[i] = raw.(Vertex)
 	}
 	return vertexList
 }

dag/graph.go

@@ -47,10 +47,9 @@ func (g *Graph) DirectedGraph() Grapher {
 
 // Vertices returns the list of all the vertices in the graph.
 func (g *Graph) Vertices() []Vertex {
-	list := g.vertices.List()
+	result := make([]Vertex, 0, len(g.vertices))
-	result := make([]Vertex, len(list))
+	for _, v := range g.vertices {
-	for i, v := range list {
+		result = append(result, v.(Vertex))
-		result[i] = v.(Vertex)
 	}
 
 	return result
@@ -58,10 +57,9 @@ func (g *Graph) Vertices() []Vertex {
 
 // Edges returns the list of all the edges in the graph.
 func (g *Graph) Edges() []Edge {
-	list := g.edges.List()
+	result := make([]Edge, 0, len(g.edges))
-	result := make([]Edge, len(list))
+	for _, v := range g.edges {
-	for i, v := range list {
+		result = append(result, v.(Edge))
-		result[i] = v.(Edge)
 	}
 
 	return result
@@ -120,10 +118,10 @@ func (g *Graph) Remove(v Vertex) Vertex {
 	g.debug.Remove(v)
 
 	// Delete the edges to non-existent things
-	for _, target := range g.DownEdges(v).List() {
+	for _, target := range g.DownEdges(v) {
 		g.RemoveEdge(BasicEdge(v, target))
 	}
-	for _, source := range g.UpEdges(v).List() {
+	for _, source := range g.UpEdges(v) {
 		g.RemoveEdge(BasicEdge(source, v))
 	}
 
@@ -148,10 +146,10 @@ func (g *Graph) Replace(original, replacement Vertex) bool {
 
 	// Add our new vertex, then copy all the edges
 	g.Add(replacement)
-	for _, target := range g.DownEdges(original).List() {
+	for _, target := range g.DownEdges(original) {
 		g.Connect(BasicEdge(replacement, target))
 	}
-	for _, source := range g.UpEdges(original).List() {
+	for _, source := range g.UpEdges(original) {
 		g.Connect(BasicEdge(source, replacement))
 	}
 
@@ -254,7 +252,7 @@ func (g *Graph) StringWithNodeTypes() string {
 		// Alphabetize dependencies
 		deps := make([]string, 0, targets.Len())
 		targetNodes := make(map[string]Vertex)
-		for _, target := range targets.List() {
+		for _, target := range targets {
 			dep := VertexName(target)
 			deps = append(deps, dep)
 			targetNodes[dep] = target
@@ -295,7 +293,7 @@ func (g *Graph) String() string {
 
 		// Alphabetize dependencies
 		deps := make([]string, 0, targets.Len())
-		for _, target := range targets.List() {
+		for _, target := range targets {
 			deps = append(deps, VertexName(target))
 		}
 		sort.Strings(deps)

dag/tarjan.go

@@ -24,7 +24,7 @@ func stronglyConnected(acct *sccAcct, g *Graph, v Vertex) int {
 	index := acct.visit(v)
 	minIdx := index
 
-	for _, raw := range g.DownEdges(v).List() {
+	for _, raw := range g.DownEdges(v) {
 		target := raw.(Vertex)
 		targetIdx := acct.VertexIndex[target]
 

dag/walk.go

@@ -174,7 +174,7 @@ func (w *Walker) Update(g *AcyclicGraph) {
 	oldVerts := w.vertices.Difference(v)
 
 	// Add the new vertices
-	for _, raw := range newVerts.List() {
+	for _, raw := range newVerts {
 		v := raw.(Vertex)
 
 		// Add to the waitgroup so our walk is not done until everything finishes
@@ -196,7 +196,7 @@ func (w *Walker) Update(g *AcyclicGraph) {
 	}
 
 	// Remove the old vertices
-	for _, raw := range oldVerts.List() {
+	for _, raw := range oldVerts {
 		v := raw.(Vertex)
 
 		// Get the vertex info so we can cancel it
@@ -219,7 +219,7 @@ func (w *Walker) Update(g *AcyclicGraph) {
 
 	// Add the new edges
 	changedDeps := make(Set)
-	for _, raw := range newEdges.List() {
+	for _, raw := range newEdges {
 		edge := raw.(Edge)
 		waiter, dep := w.edgeParts(edge)
 
@@ -249,8 +249,8 @@ func (w *Walker) Update(g *AcyclicGraph) {
 		w.edges.Add(raw)
 	}
 
-	// Process reoved edges
+	// Process removed edges
-	for _, raw := range oldEdges.List() {
+	for _, raw := range oldEdges {
 		edge := raw.(Edge)
 		waiter, dep := w.edgeParts(edge)
 
@@ -275,7 +275,7 @@ func (w *Walker) Update(g *AcyclicGraph) {
 
 	// For each vertex with changed dependencies, we need to kick off
 	// a new waiter and notify the vertex of the changes.
-	for _, raw := range changedDeps.List() {
+	for _, raw := range changedDeps {
 		v := raw.(Vertex)
 		info, ok := w.vertexMap[v]
 		if !ok {
@@ -320,7 +320,7 @@ func (w *Walker) Update(g *AcyclicGraph) {
 
 	// Start all the new vertices. We do this at the end so that all
 	// the edge waiters and changes are setup above.
-	for _, raw := range newVerts.List() {
+	for _, raw := range newVerts {
 		v := raw.(Vertex)
 		go w.walkVertex(v, w.vertexMap[v])
 	}