Add empty main to satisfy mdbook

jhwgh1968 · jhwgh1968 · commit 59129ca80dd3 · 2021-04-11T11:22:40.000-05:00
diff --git a/functional/generics-type-classes.md b/functional/generics-type-classes.md
@@ -176,6 +176,10 @@ impl FileDownloadRequest<Nfs> {
         self.protocol.mount_point()
     }
 }
+
+fn main() {
+    // your code here
+}
 ```
 
 With this approach, if the user were to make a mistake and use the wrong

Original file line number	Diff line number	Diff line change
`@@ -176,6 +176,10 @@ impl FileDownloadRequest<Nfs> {`
`176`	`176`	`self.protocol.mount_point()`
`177`	`177`	`}`
`178`	`178`	`}`
	`179`	`+`
	`180`	`+fn main() {`
	`181`	`+ // your code here`
	`182`	`+}`
`179`	`183`	```
`180`	`184`
`181`	`185`	`With this approach, if the user were to make a mistake and use the wrong`