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error[E0658]: box expression syntax is experimental; you can call `Box::new` instead
--> $DIR/feature-gate-box_syntax.rs:4:13
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LL | let x = box 3;
| ^^^^^
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= note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
= help: add `#![feature(box_syntax)]` to the crate attributes to enable
error: aborting due to previous error
For more information about this error, try `rustc --explain E0658`.
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