add multi-line test case

Author: togami2864

tests/ui/option_map_or_none.rs

@@ -16,4 +16,9 @@ fn main() {
                        });
     // function returning `Option`
     let _: Option<i32> = opt.map_or(None, bar);
+    let _: Option<i32> = opt.map_or(None, |x| {
+        let offset = 0;
+        let height = 1;
+        Some(offset + height)
+    });
 }