Comment parsing
diff --git a/tests/cases/comment.rs b/tests/cases/comment.rs
new file mode 100644
index 0000000..d7ab22b
--- /dev/null
+++ b/tests/cases/comment.rs
@@ -0,0 +1,24 @@
+//! inner line doc comment
+
+/*! inner block doc comment
+ *
+ * /* nested block comment */
+ */
+
+// line comment
+
+/* block comment
+ *
+ * /* nested block comment */
+ */
+
+//// banner comment
+
+/// line doc comment
+
+/** block doc comment
+ *
+ * /* nested block comment */
+ */
+
+struct Success;