Update dsl.md (#185)

fake-rick · web-flow · commit 071c8e0622e0 · 2024-01-13T19:35:02.000+08:00
diff --git a/src/macros/dsl.md b/src/macros/dsl.md
@@ -6,12 +6,12 @@ DSL 是 Rust 的宏中集成的微型 “语言”。这种语言是完全合法
 
 ```rust,editable
 macro_rules! calculate {
-    (eval $e:expr) => {{
+    (eval $e:expr) => {
         {
             let val: usize = $e; // 强制类型为整型
             println!("{} = {}", stringify!{$e}, val);
         }
-    }};
+    };
 }
 
 fn main() {

Original file line number	Diff line number	Diff line change
`@@ -6,12 +6,12 @@ DSL 是 Rust 的宏中集成的微型 “语言”。这种语言是完全合法`
`6`	`6`
`7`	`7`	```rust,editable
`8`	`8`	`macro_rules! calculate {`
`9`		`- (eval $e:expr) => {{`
	`9`	`+ (eval $e:expr) => {`
`10`	`10`	`{`
`11`	`11`	`let val: usize = $e; // 强制类型为整型`
`12`	`12`	`println!("{} = {}", stringify!{$e}, val);`
`13`	`13`	`}`
`14`		`- }};`
	`14`	`+ };`
`15`	`15`	`}`
`16`	`16`
`17`	`17`	`fn main() {`