Added more examples

src/build/expression/Expression.go

@@ -55,14 +55,16 @@ func (expr *Expression) Count(buffer []byte, kind token.Kind, name string) uint8
 
 // Reset resets all values to the default.
 func (expr *Expression) Reset() {
-	for _, child := range expr.Children {
-		child.Reset()
+	expr.Parent = nil
+
+	if expr.Children != nil {
+		expr.Children = expr.Children[:0]
 	}
 
 	expr.Token.Reset()
-	expr.Parent = nil
-	expr.Children = expr.Children[:0]
+	expr.Value = 0
 	expr.Precedence = 0
+	expr.IsFolded = false
 }
 
 // EachLeaf iterates through all leaves in the tree.