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