tpl: Sync go_templates for Go 1.18

Using Go tag go1.18 4aa1efed4853ea067d665a952eee77c52faac774

Updates #9677

tpl/internal/go_templates/texttemplate/parse/node.go

@@ -71,6 +71,8 @@ const (
 	NodeVariable                   // A $ variable.
 	NodeWith                       // A with action.
 	NodeComment                    // A comment.
+	NodeBreak                      // A break action.
+	NodeContinue                   // A continue action.
 )
 
 // Nodes.
@@ -907,6 +909,40 @@ func (i *IfNode) Copy() Node {
 	return i.tr.newIf(i.Pos, i.Line, i.Pipe.CopyPipe(), i.List.CopyList(), i.ElseList.CopyList())
 }
 
+// BreakNode represents a {{break}} action.
+type BreakNode struct {
+	tr *Tree
+	NodeType
+	Pos
+	Line int
+}
+
+func (t *Tree) newBreak(pos Pos, line int) *BreakNode {
+	return &BreakNode{tr: t, NodeType: NodeBreak, Pos: pos, Line: line}
+}
+
+func (b *BreakNode) Copy() Node                  { return b.tr.newBreak(b.Pos, b.Line) }
+func (b *BreakNode) String() string              { return "{{break}}" }
+func (b *BreakNode) tree() *Tree                 { return b.tr }
+func (b *BreakNode) writeTo(sb *strings.Builder) { sb.WriteString("{{break}}") }
+
+// ContinueNode represents a {{continue}} action.
+type ContinueNode struct {
+	tr *Tree
+	NodeType
+	Pos
+	Line int
+}
+
+func (t *Tree) newContinue(pos Pos, line int) *ContinueNode {
+	return &ContinueNode{tr: t, NodeType: NodeContinue, Pos: pos, Line: line}
+}
+
+func (c *ContinueNode) Copy() Node                  { return c.tr.newContinue(c.Pos, c.Line) }
+func (c *ContinueNode) String() string              { return "{{continue}}" }
+func (c *ContinueNode) tree() *Tree                 { return c.tr }
+func (c *ContinueNode) writeTo(sb *strings.Builder) { sb.WriteString("{{continue}}") }
+
 // RangeNode represents a {{range}} action and its commands.
 type RangeNode struct {
 	BranchNode