Add test case

Author: ding-young

tests/source/arrow_in_comments/multiple_arrows.rs

@@ -0,0 +1,14 @@
+// rustfmt-wrap_comments: true
+fn main() {
+    match a {
+        _ => // comment with => 
+        match b {
+            // one goes to =>
+            one => {
+                println("1");
+            }
+            // two goes to =>
+            two => { println("2"); }
+        } 
+    }
+}

tests/target/arrow_in_comments/multiple_arrows.rs

@@ -0,0 +1,19 @@
+// rustfmt-wrap_comments: true
+fn main() {
+    match a {
+        _ =>
+        // comment with =>
+        {
+            match b {
+                // one goes to =>
+                one => {
+                    println("1");
+                }
+                // two goes to =>
+                two => {
+                    println("2");
+                }
+            }
+        }
+    }
+}