error: changes to closure capture in Rust 2021 will affect drop order --> $DIR/macro.rs:19:13 | LL | let _ = || dbg!(a.0); | ^^ --- in Rust 2018, this closure captures all of `a`, but in Rust 2021, it will only capture `a.0` ... LL | } | - in Rust 2018, `a` is dropped here, but in Rust 2021, only `a.0` will be dropped here as part of the closure | note: the lint level is defined here --> $DIR/macro.rs:5:9 | LL | #![deny(rust_2021_incompatible_closure_captures)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = note: for more information, see help: add a dummy let to cause `a` to be fully captured | LL | let _ = || { let _ = &a; dbg!(a.0) }; | +++++++++++++ + error: aborting due to previous error