mirror of https://github.com/rust-lang/rust
34 lines
1.2 KiB
Plaintext
34 lines
1.2 KiB
Plaintext
warning: changes to closure capture in Rust 2021 will affect drop order
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--> $DIR/closure-body-macro-fragment.rs:16:17
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LL | let f = || $body;
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| ^^
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...
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LL | }};
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| - in Rust 2018, `a` is dropped here, but in Rust 2021, only `a.0` will be dropped here as part of the closure
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...
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LL | / m!({
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LL | |
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LL | | let x = a.0;
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| | --- in Rust 2018, this closure captures all of `a`, but in Rust 2021, it will only capture `a.0`
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LL | | println!("{:?}", x);
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LL | | });
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| |______- in this macro invocation
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= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/disjoint-capture-in-closures.html>
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note: the lint level is defined here
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--> $DIR/closure-body-macro-fragment.rs:4:9
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LL | #![warn(rust_2021_compatibility)]
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| ^^^^^^^^^^^^^^^^^^^^^^^
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= note: `#[warn(rust_2021_incompatible_closure_captures)]` implied by `#[warn(rust_2021_compatibility)]`
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= note: this warning originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
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help: add a dummy let to cause `a` to be fully captured
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LL ~ m!({
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LL + let _ = &a;
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warning: 1 warning emitted
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