Jump to definition does nothing with cursor on `*=`

[WhyNotHugo]

When the cursor is on operators like +, +=, *=, using the LSP action "jump to definition" does nothing.

It should jump to the definition of impl Add<X> for Y, X and Y depending on the current context too.

This is more of a feature request than a bug; I don't think any other LSP does this, but I it seems perfectly feasible -- especially where Rust where I'm sure this can be inferred.

[Veykril]

Hover should ideally also work here