`generic_const_items` syntax gets deleted

[lukas-code]

#![feature(generic_const_items)]
const C<T>: Option<T> = None;

becomes

#![feature(generic_const_items)]
const C: Option<T> = None;

playground

[ytmimi]

@lukas-code thanks for the report. I made a note of it on the tracking issue rust-lang/rust#113521

[fmease]

Should we close this issue now that rust-lang/rust#132540 has been merged?
Of course, that change hasn't been synced yet with this repo but I think that's acceptable.

The aforementioned PR doesn't implement proper formatting for GCIs but it prevents rustfmt from deleting syntax.
Codifying the style of GCIs (T-style, style guide) and impl'ing formatting (T-rustfmt) are already tracked in rust-lang/rust#113521.

[calebcartwright]

yeah sounds reasonable, thanks for the follow up