FN: iter_cloned_collect with a large array

[Y-Nak]

Lint name: iter_cloned_collect

I tried this code:

let arr: [u8; 64] = [0; 64];
let v: Vec<_> = arr.iter().cloned().collect();

I expected to see this happened: iter_cloned_collect is triggered.

Instead, this happened: nothing.

Meta

• cargo clippy -V: clippy 0.0.212 (cb75ad5 2021-02-10)
• rustc -Vv:

rustc 1.50.0 (cb75ad5db 2021-02-10)
binary: rustc
commit-hash: cb75ad5db02783e8b0222fee363c5f63f7e2cf5b
commit-date: 2021-02-10
host: x86_64-unknown-linux-gnu
release: 1.50.0

---

I think this is caused by derefs_to_slice and I suppose we should use expr_ty_adjusted instead of may_slice to handle coercion in the function.

[mgacek8]

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