Double-forward slashes are treated like comments when they aren't

[nicksloan]

Describe the bug
If you have a line of code that features two consecutive forward slashes that are not a comment and insert a new line before the end of the line, a comment is inserted on the new line containing the remaining content of the original line.

To Reproduce
Steps to reproduce the behavior:

1. Insert the following code:

   func test() {
     let someStrings = ["/something"]
     let _ = someStrings.map { $0.replacing(/\//, with: "") }
   }

2. Insert a new line before the }
3. Observe the inappropriate comment

Expected behavior
A clear and concise description of what you expected to happen.

Environment

• OS: MacOS Tahoe
• Swift version (output of swift --version):
  Apple Swift version 6.2 (swift-6.2-RELEASE)
  Target: arm64-apple-macosx26.0
  Build config: +assertions
• Visual Studio Code version: 1.105.0
• vscode-swift version: 2.11.20250806

[award999]

@nicksloan to confirm, it compiles correctly but it is highlighted as a comment in the editor?

[plemarquand]

@award999 If you have the following swift code: let x = { /\// }

and you place the cursor just before the last } and hit enter, a comment is automatically inserted incorrectly:

let x = { /\// 
// }

[plemarquand]

This looks like an issue in vscode's swift language support itself, specifically w/ their onEnterRule for when to add a comment : https://github.com/microsoft/vscode/blob/d62af7efaf8e0f5a7827563405f185f1d4687dc2/extensions/swift/language-configuration.json#L85