diff --git a/en/src/basic-types/functions.md b/en/src/basic-types/functions.md
index f4d2762..a9acba0 100644
--- a/en/src/basic-types/functions.md
+++ b/en/src/basic-types/functions.md
@@ -85,7 +85,7 @@ fn main() {
     // FILL in the blank
     let b = __;
 
-    let v = match b {
+    let _v = match b {
         true => 1,
         // Diverging functions can also be used in match expression to replace a value of any value
         false => {
diff --git a/solutions/basic-types/functions.md b/solutions/basic-types/functions.md
index f33e184..e01ddd3 100644
--- a/solutions/basic-types/functions.md
+++ b/solutions/basic-types/functions.md
@@ -108,7 +108,7 @@ fn main() {
     // FILL in the blank
     let b = false;
 
-    let v = match b {
+    let _v = match b {
         true => 1,
         // Diverging functions can also be used in match expression
         false => {
diff --git a/zh-CN/src/basic-types/functions.md b/zh-CN/src/basic-types/functions.md
index b5528e6..fe4272c 100644
--- a/zh-CN/src/basic-types/functions.md
+++ b/zh-CN/src/basic-types/functions.md
@@ -77,7 +77,7 @@ fn main() {
     // 填空
     let b = __;
 
-    let v = match b {
+    let _v = match b {
         true => 1,
         // 发散函数也可以用于 `match` 表达式，用于替代任何类型的值
         false => {