Fix an uncompilable example of derive macro

yvt · web-flow · commit b111c4704caa · 2019-05-29T17:30:35.000+09:00
diff --git a/src/procedural-macros.md b/src/procedural-macros.md
@@ -173,7 +173,7 @@ For example, the following derive macro defines a helper attribute
 
 #[proc_macro_derive(HelperAttr, attributes(helper))]
 pub fn derive_helper_attr(_item: TokenStream) -> TokenStream {
-    TokenStream::new();
+    TokenStream::new()
 }
 ```
 

Original file line number	Diff line number	Diff line change
`@@ -173,7 +173,7 @@ For example, the following derive macro defines a helper attribute`
`173`	`173`
`174`	`174`	`#[proc_macro_derive(HelperAttr, attributes(helper))]`
`175`	`175`	`pub fn derive_helper_attr(_item: TokenStream) -> TokenStream {`
`176`		`- TokenStream::new();`
	`176`	`+ TokenStream::new()`
`177`	`177`	`}`
`178`	`178`	```
`179`	`179`