error: changes to closure capture in Rust 2021 will affect which traits the closure implements --> $DIR/auto_traits.rs:22:19 | LL | thread::spawn(move || unsafe { | ^^^^^^^ in Rust 2018, this closure implements `Send` as `fptr` implements `Send`, but in Rust 2021, this closure will no longer implement `Send` because `fptr` is not fully captured and `fptr.0` does not implement `Send` ... LL | *fptr.0 = 20; | ------- in Rust 2018, this closure captures all of `fptr`, but in Rust 2021, it will only capture `fptr.0` | = note: for more information, see note: the lint level is defined here --> $DIR/auto_traits.rs:2:9 | LL | #![deny(rust_2021_incompatible_closure_captures)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add a dummy let to cause `fptr` to be fully captured | LL ~ thread::spawn(move || { let _ = &fptr; unsafe { LL | ... LL | LL ~ } }).join().unwrap(); | error: changes to closure capture in Rust 2021 will affect which traits the closure implements --> $DIR/auto_traits.rs:42:19 | LL | thread::spawn(move || unsafe { | ^^^^^^^ | | | in Rust 2018, this closure implements `Send` as `fptr` implements `Send`, but in Rust 2021, this closure will no longer implement `Send` because `fptr` is not fully captured and `fptr.0.0` does not implement `Send` | in Rust 2018, this closure implements `Sync` as `fptr` implements `Sync`, but in Rust 2021, this closure will no longer implement `Sync` because `fptr` is not fully captured and `fptr.0.0` does not implement `Sync` ... LL | *fptr.0.0 = 20; | --------- in Rust 2018, this closure captures all of `fptr`, but in Rust 2021, it will only capture `fptr.0.0` | = note: for more information, see help: add a dummy let to cause `fptr` to be fully captured | LL ~ thread::spawn(move || { let _ = &fptr; unsafe { LL | ... LL | LL ~ } }).join().unwrap(); | error: changes to closure capture in Rust 2021 will affect drop order and which traits the closure implements --> $DIR/auto_traits.rs:67:13 | LL | let c = || { | ^^ in Rust 2018, this closure implements `Clone` as `f` implements `Clone`, but in Rust 2021, this closure will no longer implement `Clone` because `f` is not fully captured and `f.1` does not implement `Clone` ... LL | let f_1 = f.1; | --- in Rust 2018, this closure captures all of `f`, but in Rust 2021, it will only capture `f.1` ... LL | } | - in Rust 2018, `f` is dropped here, but in Rust 2021, only `f.1` will be dropped here as part of the closure | = note: for more information, see help: add a dummy let to cause `f` to be fully captured | LL ~ let c = || { LL + let _ = &f; | error: aborting due to 3 previous errors