LibJS: "-->" preceded by token on same line isn't start of HTML-like comment

B.1.3 HTML-like Comments

The syntax and semantics of 11.4 is extended as follows except that this
extension is not allowed when parsing source code using the goal symbol
Module:

Syntax (only relevant part included)

    SingleLineHTMLCloseComment ::
        LineTerminatorSequence HTMLCloseComment

    HTMLCloseComment ::
        WhiteSpaceSequence[opt] SingleLineDelimitedCommentSequence[opt] --> SingleLineCommentChars[opt]

Fixes #3810.

1 files changed, 10 insertions, 6 deletions

diff --git a/Libraries/LibJS/Tests/comments-basic.js b/Libraries/LibJS/Tests/comments-basic.js
index f013d59f70..3dbe6aec1e 100644
--- a/Libraries/LibJS/Tests/comments-basic.js
+++ b/Libraries/LibJS/Tests/comments-basic.js
@@ -1,25 +1,29 @@
 test("regular comments", () => {
-    const source = `var i = 0;
-
+    const source = `
+var i = 0;
 // i++;
 /* i++; */
 /*
 i++;
 */
+/**/ i++;
 return i;`;
 
-    expect(source).toEvalTo(0);
+    expect(source).toEvalTo(1);
 });
 
 test("html comments", () => {
-    const source = `var i = 0;
+    const source = `
+var i = 0;
+var j = 0;
 <!-- i++; --> i++;
 <!-- i++;
 i++;
 --> i++;
+/**/ --> i++;
+j --> i++;
 return i;`;
-
-    expect(source).toEvalTo(1);
+    expect(source).toEvalTo(2);
 });
 
 test("unterminated multi-line comment", () => {