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error[E0015]: cannot call non-const closure in constants
--> $DIR/issue-28113.rs:4:5
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LL | || -> u8 { 5 }()
| ^^^^^^^^^^^^^^^^
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= note: closures need an RFC before allowed to be called in constants
= note: calls in constants are limited to constant functions, tuple structs and tuple variants
= help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
error: aborting due to previous error
For more information about this error, try `rustc --explain E0015`.
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