How to make an extension have highlighting of another language

[nikitavoloboev]

Check for existing issues

• Completed

Describe the feature

I want to have .rss extension have rust syntax highlighting.

How can I do this?

[ethanmsl]

Configuring Languages: File Associations

[jonaspiterek]

This should work:
settings.json

{
    "file_types": {
        "RUST": ["*.rss"]
    }
}