Don't underline function definition if self is &mut

[matklad]

The self is right there, and is already underlined, so it makes little
sense to emit even more underlines.

before:

after:

[matklad]

bors d=@Nashenas88

[bors]

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[Nashenas88]

I had the same idea regarding unsafe as well (the fn name is highlighted as unsafe, when it's really not needed since the unsafe keyword is two tokens behind the fn name, and creating an unsafe fn isn't an unsafe operation). Should I add that change here as well or as a follow-up?

[matklad]

Hm, not sure about unsafe.... Given that unsafe differs only in color (and not in decaorations), the difference doesn't seem as jarring there...

[Nashenas88]

bors r+

[bors]

Build succeeded:

• Rust (ubuntu-latest)
• Rust (windows-latest)
• TypeScript (ubuntu-latest)
• TypeScript (windows-latest)