Vetur: Vetur generates invalid comments in PostCSS

[ky-is]

• [x] I have searched through existing issues
• [x] I have read through docs
• [x] I have read FAQ

Info

• Platform: macOS 10.13
• Vetur version: 0.12.6
• VS Code version: 1.25.1

Problem

Single line // ... comments are not valid for postcss's default parser. VSCode's "Toggle Line Comment" inside lang="postcss" with Vetur should generate /* ... */ instead.

Reproducible Case

<style lang="postcss">
// @import '..';
</style>

[robertweiss]

Platform: macOS 10.12.6
Vetur version: 0.12.6
VS Code version: 1.28.0 Insider

I have the same problem, it also appears in separate *.css files which have language mode PostCSS set. When I switch off Vetur, I get the correct /* */comments, when switched on, I get the // comment style.

[octref]

Sounds good. CSS spec also does not include // comment. It's allowed only in SCSS.