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warning: changes to closure capture in Rust 2021 will affect drop order
--> $DIR/rfc2229-migration.rs:18:13
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LL | let f = use || {
| ^^^^^^
...
LL | let x = 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: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/disjoint-capture-in-closures.html>
note: the lint level is defined here
--> $DIR/rfc2229-migration.rs:5:9
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LL | #![warn(rust_2021_compatibility)]
| ^^^^^^^^^^^^^^^^^^^^^^^
= note: `#[warn(rust_2021_incompatible_closure_captures)]` implied by `#[warn(rust_2021_compatibility)]`
help: add a dummy let to cause `a` to be fully captured
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LL ~ let f = use || {
LL + let _ = &a;
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warning: 1 warning emitted
|
