Tracking issue for Rust clippy same_item_push false positives

[bgurney-rh]

While going through the Rust 1.46 release steps, there was a clippy lint for same_item_push that falsely triggered in devicemapper-rs

"rustup default beta" (rustc 1.47.0-beta.1)

error: it looks like the same item is being pushed into this Vec
   --> src/core/dm.rs:582:17
    |
582 |                 targets.push((targ.sector_start, targ.length, target_type, params));
    |                 ^^^^^^^
    |
    = note: `-D clippy::same-item-push` implied by `-D warnings`
    = help: try using vec![(targ.sector_start, targ.length, target_type, params);SIZE] or targets.resize(NEW_SIZE, (targ.sector_start, targ.length, target_type, params))
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#same_item_push

The original issue was filed on August 13, 2020:
same_item_push lint can trigger when the pushed value is not constant: rust-lang/rust-clippy#5902

However, there's a couple new issues related to same_item_push:

"same_item_push is incorrect in several cases": rust-lang/rust-clippy#5985

"same_item_push being suggested for values that are not Copy or Clone": rust-lang/rust-clippy#5979