fix csv Flush;

exp/csvw/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"bytes"
+	"encoding/csv"
+	"fmt"
+	"io"
+)
+
+func main() {
+	fmt.Println("vim-go")
+	var b bytes.Buffer
+	writer := csv.NewWriter(&b)
+	err := writer.Write([]string{
+		"foo",
+		"bar",
+		"blah",
+	})
+	if err != nil {
+		panic(err)
+	}
+	writer.Flush()
+	b.WriteString("Hello World")
+	content, err := io.ReadAll(&b)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("%s\n", content)
+	fmt.Println("bye")
+}