fix example

RalfJung · RalfJung · commit 41a02cf4eda2 · 2018-08-13T23:25:50.000+02:00
diff --git a/text/0000-union-initialization-and-drop.md b/text/0000-union-initialization-and-drop.md
@@ -173,7 +173,7 @@ When a union implementing `Drop` goes out of scope, its destructor gets called i
 }
 {
     let u = U { f1: ManuallyDrop::new(Vec::new()) };
-    foo(u.f2);
+    foo(u);
     // drop does NOT get called
 }
 ```

Original file line number	Diff line number	Diff line change
@@ -173,7 +173,7 @@ When a union implementing `Drop` goes out of scope, its destructor gets called i
`173`	`173`	`}`
`174`	`174`	`{`
`175`	`175`	`let u = U { f1: ManuallyDrop::new(Vec::new()) };`
`176`		`- foo(u.f2);`
	`176`	`+ foo(u);`
`177`	`177`	`// drop does NOT get called`
`178`	`178`	`}`
`179`	`179`	```