rustlang: Support formatting of popups

[Kreyren]

GitPod doesn't seem to process the popups formatting correctly:

I assume that this should be formatted alike:

expected identifier, found "fibonnaci-kreyren"

[JesterOrNot]

This is likley an issue with the extension, also, as far as I know that is not how you do things in rust try

use fibonnaci-kreyren;

instead of a string literal

[JesterOrNot]

@akosyakov Can you take a look at this?

[Kreyren]

instead of a string literal -- @JesterOrNot

That is a syntax error made to present this issue i am aware of it breaking the build.

To clarify this issue is about formatting of popups on gitpod since it outputs `something` instead of something

[Kreyren]

This seems to be resolved now: