False positive dead_code lint when type is only used via destructuring #132874
Description
Code
struct Foo(usize); fn get_thing<T>() -> T { todo!() } pub fn foo() { let Foo(_x) = get_thing(); // no warning if the type is explicitly used when calling get_thing // let Foo(_x) = get_thing::<Foo>(); }Current output
warning: struct `Foo` is never constructed --> src/lib.rs:1:8 | 1 | struct Foo(usize); | ^^^ | = note: `#[warn(dead_code)]` on by defaultDesired output
(nothing)Rationale and extra context
For context, the specific "get_thing" function I originally ran into this was with zerocopy::FromBytes::read_from_bytes.
Other cases
Rust Version
$ rustc --version --verbose rustc 1.82.0 (f6e511eec 2024-10-15) binary: rustc commit-hash: f6e511eec7342f59a25f7c0534f1dbea00d01b14 commit-date: 2024-10-15 host: x86_64-unknown-linux-gnu release: 1.82.0 LLVM version: 19.1.1Anything else?
No response