2657: Omit closure parameters in closure type display strings r=flodiebold a=SomeoneToIgnore
Part of https://github.com/rust-analyzer/rust-analyzer/issues/1946
I wonder, should we display the the closure trait (Fn/FnMut/FnOnce) in inlay hints instead of `|...|` at all?
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>