Add tests for issue 5017

Issue 5017 was fixed by backporting PR 3857 and PR 4550.

Author: ytmimi

tests/source/issue_5017.rs

@@ -0,0 +1,5 @@
+fn main() {
+    let number = 
+    // A comment
+    1;
+}

tests/target/issue_5017.rs

@@ -0,0 +1,5 @@
+fn main() {
+    let number =
+        // A comment
+        1;
+}