Better comments

Problem
-------
The following comment combinations are not parsed:
1. ```
// /*
// *
// */
```
2. ```
/* // */
```
Solution
-------
- set higher lexing priority for `$._comment_text` token
- include "//" as an alternative to the contents of `$.block_comment`

corpus/comments.txt

@@ -29,8 +29,33 @@ Block comments
   (block_comment)
   (block_comment
     (block_comment
-      (block_comment)
-      (comment))))
+      (block_comment))))
+
+================================================================================
+Single line comments with block comment
+================================================================================
+
+// /*
+//  * This is awesome comment
+// */
+
+--------------------------------------------------------------------------------
+
+(compilation_unit
+  (comment)
+  (comment)
+  (comment))
+
+================================================================================
+Block comment with single-line comment inside
+================================================================================
+
+/* // */
+
+--------------------------------------------------------------------------------
+
+(compilation_unit
+  (block_comment))
 
 ================================================================================
 Using directives

grammar.js

@@ -1,6 +1,6 @@
 const PREC = {
-  comment: 0,
-  using_directive: 1,
+  comment: 1,
+  using_directive: 2,
   control: 1,
   stable_type_id: 2,
   while: 2,
@@ -1602,7 +1602,6 @@ module.exports = grammar({
       ),
 
     comment: $ => seq(token("//"), choice($.using_directive, $._comment_text)),
-
     _comment_text: $ => token(prec(PREC.comment, /.*/)),
 
     using_directive: $ =>
@@ -1615,7 +1614,8 @@ module.exports = grammar({
     using_directive_key: $ => token(/[^\s]+/),
     using_directive_value: $ => token(/.*/),
 
-    block_comment: $ => seq(token("/*"), repeat(token(/./)), token("*/")),
+    block_comment: $ =>
+      seq(token("/*"), repeat(choice(token(/./), token("//"))), token("*/")),
   },
 });