Remove misleading ?Sized requirement - Deserialize requires Sized

[Mingun]

Deserialize trait requires Sized types, so there no sense to declare ?Sized bounds:

serde/serde/src/de/mod.rs

Line 537 in 05a5b7e

pub trait Deserialize<'de>: Sized {

[Mingun]

Implemented in 89139e2.

[dtolnay]

Thank you — sorry I missed that there was already a PR for this. I noticed the redundant bounds as part of resolving clippy::multiple_bound_locations lints (c9cab49).

Would you want to follow up with a Clippy feature request to detect this case with ?Sized?

[Mingun]

Probably this should be compile time error instead of a lint error. Actually, this case can be reduced to Sized + ?Sized boundary and compiler should not silently assume any concrete behavior here.