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error[E0658]: box expression syntax is experimental; you can call `Box::new` instead. (see issue #27779)
--> $DIR/feature-gate-box-expr.rs:22:13
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LL | let x = box 'c'; //~ ERROR box expression syntax is experimental
| ^^^^^^^
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= 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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