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error[E0277]: the size for values of type `[u32]` cannot be known at compilation time
--> $DIR/issue-87935-unsized-box-expr.rs:4:30
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LL | let _x: Box<[u32]> = box { loop {} };
| ^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[u32]`
= note: the type of a box expression must have a statically known size
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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