Use of possible unsound auto trait impl in the index_vec.

[rzvxa]

This needs to be addressed in the future since Rust is breaking the compatibility for this one.

#3092 (comment)

[Boshen]

The clippy warning suspicious_auto_trait_impls is removed after the 1.78.0 upgrade. I'm not sure if there are more actionable items to this issue.

[rzvxa]

The clippy warning suspicious_auto_trait_impls is removed after the 1.78.0 upgrade. I'm not sure if there are more actionable items to this issue.

To be honest I'm not sure ATM, The issue is that auto trait impls for Adt<Any> are going to be ignored.

The goal for this auto impl in the indexed_vec is to have the same Send/Sync as the inner T within a wrapped generic slice.
There might be other ways to approach it or we might not even need it since we are not advertising oxc_index as a general-purpose crate.

I've mostly created this issue so we can keep track of it, I didn't put that much thought into fixing it since we wanted to have a clean fork before doing any changes to it.

rust-lang/rust#113312
rust-lang/rust#93367 (comment)