Type parameters in where clauses are not recognised

[little-arhat]

as a consequence, rls fails to rename type parameters in where clauses:

pub trait SomeTrait {}

pub struct Opa<TP>
where
    TP: SomeTrait,
{
    tp: TP,
}

After renaming TP type parameter to TPTP I've got:

pub struct Opa<TPTP>
where
    TP: SomeTrait,
{
    tp: TPTP,
}
```.

`TP` in where clause is also not highlighted when cursor is on `TP` in `struct Opa<TP>`. 

$ rls --version
rls-preview 0.130.2-nightly (6d72813 2018-08-04)

I'm using `rls` in emacs.

[nrc]

This will be fixed by rust-lang/rust#53838